Drought Indicators: EDDI
*EXPERIMENTAL* Proof of concept comparing EDDI products at various time scales produced from various input precipitation datasets using Climate Engine. Data may not be up-to-date. *USE WITH CAUTION*
1-Week
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
The Evaporative Demand Drought Index (EDDI) is a drought monitoring tool that shows the anomaly in daily evaporative demand over a given period time. Evaporative demand is the atmospheric influence on the drying of the landscape, or "the thirst of the atmosphere." Unusually high evaporative demand can lead to moisture stress on the land surface, and ultimately to drought—even when precipitation has been near-normal.
EDDI can serve as an indicator of both rapidly evolving "flash" droughts and sustained droughts and can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the GridMET daily dataset, using a 1991-2020 reference period, nonparametric distribution, and Penman-Monteith PET (potential evapotranspiration).
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the NOAA nClimGrid-Daily dataset, using a nonparametric distribution and Hargreaves PET.
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
This GridMET-based EDDI updates daily, with a latency of 3–5 days.
Updates daily with a delay of 5-7 days
Updates daily, with a latency of 4-7 days
Updates daily, with a latency of 2-4 days.
Updates daily, with a latency of 2-4 days.
Updates daily, with a latency of 2-4 days.
Updates daily, with a latency of 2-4 days.
Updates daily, with a latency of 2-4 days.
Updates daily with a delay of 5-7 days
2-Week
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
The Evaporative Demand Drought Index (EDDI) is a drought monitoring tool that shows the anomaly in daily evaporative demand over a given period time. Evaporative demand is the atmospheric influence on the drying of the landscape, or "the thirst of the atmosphere." Unusually high evaporative demand can lead to moisture stress on the land surface, and ultimately to drought—even when precipitation has been near-normal.
EDDI can serve as an indicator of both rapidly evolving "flash" droughts and sustained droughts and can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the GridMET daily dataset, using a 1991-2020 reference period, nonparametric distribution, and Penman-Monteith PET (potential evapotranspiration).
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the NOAA nClimGrid-Daily dataset, using a nonparametric distribution and Hargreaves PET.
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
This GridMET-based EDDI updates daily, with a latency of 3–5 days.
Daily with a delay of 5-7 days
Updates daily, with a latency of 4-7 days
Updates daily, with a latency of 2-4 days.
Updates daily, with a latency of 2-4 days.
Updates daily, with a latency of 2-4 days.
Updates daily, with a latency of 2-4 days.
Updates daily, with a latency of 2-4 days.
Updates daily with a delay of 5-7 days
1-Month
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
The Evaporative Demand Drought Index (EDDI) is a drought monitoring tool that shows the anomaly in daily evaporative demand over a given period time. Evaporative demand is the atmospheric influence on the drying of the landscape, or "the thirst of the atmosphere." Unusually high evaporative demand can lead to moisture stress on the land surface, and ultimately to drought—even when precipitation has been near-normal.
EDDI can serve as an indicator of both rapidly evolving "flash" droughts and sustained droughts and can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the GridMET daily dataset, using a 1991-2020 reference period, nonparametric distribution, and Penman-Monteith PET (potential evapotranspiration).
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the NOAA nClimGrid-Daily dataset, using a nonparametric distribution and Hargreaves PET.
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
This GridMET-based EDDI updates daily, with a latency of 3–5 days.
Daily with a delay of 5-7 days
Updates daily, with a latency of 4-7 days
Updates daily, with a latency of 2-4 days.
Updates daily with a delay of 5-7 days
2-Month
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
The Evaporative Demand Drought Index (EDDI) is a drought monitoring tool that shows the anomaly in daily evaporative demand over a given period time. Evaporative demand is the atmospheric influence on the drying of the landscape, or "the thirst of the atmosphere." Unusually high evaporative demand can lead to moisture stress on the land surface, and ultimately to drought—even when precipitation has been near-normal.
EDDI can serve as an indicator of both rapidly evolving "flash" droughts and sustained droughts and can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the GridMET daily dataset, using a 1991-2020 reference period, nonparametric distribution, and Penman-Monteith PET (potential evapotranspiration).
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the NOAA nClimGrid-Daily dataset, using a nonparametric distribution and Hargreaves PET.
This GridMET-based EDDI updates daily, with a latency of 3–5 days.
Daily with a delay of 5-7 days
Updates daily, with a latency of 4-7 days
Updates daily with a delay of 5-7 days
3-Month
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
The Evaporative Demand Drought Index (EDDI) is a drought monitoring tool that shows the anomaly in daily evaporative demand over a given period time. Evaporative demand is the atmospheric influence on the drying of the landscape, or "the thirst of the atmosphere." Unusually high evaporative demand can lead to moisture stress on the land surface, and ultimately to drought—even when precipitation has been near-normal.
EDDI can serve as an indicator of both rapidly evolving "flash" droughts and sustained droughts and can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the GridMET daily dataset, using a 1991-2020 reference period, nonparametric distribution, and Penman-Monteith PET (potential evapotranspiration).
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the NOAA nClimGrid-Daily dataset, using a nonparametric distribution and Hargreaves PET.
This GridMET-based EDDI updates daily, with a latency of 3–5 days.
Daily with a delay of 5-7 days
Updates daily, with a latency of 4-7 days
Updates daily with a delay of 5-7 days
6-Month
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
The Evaporative Demand Drought Index (EDDI) is a drought monitoring tool that shows the anomaly in daily evaporative demand over a given period time. Evaporative demand is the atmospheric influence on the drying of the landscape, or "the thirst of the atmosphere." Unusually high evaporative demand can lead to moisture stress on the land surface, and ultimately to drought—even when precipitation has been near-normal.
EDDI can serve as an indicator of both rapidly evolving "flash" droughts and sustained droughts and can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the GridMET daily dataset, using a 1991-2020 reference period, nonparametric distribution, and Penman-Monteith PET (potential evapotranspiration).
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the NOAA nClimGrid-Daily dataset, using a nonparametric distribution and Hargreaves PET.
This GridMET-based EDDI updates daily, with a latency of 3–5 days.
Daily with a delay of 5-7 days
Updates daily, with a latency of 4-7 days
Updates daily with a delay of 5-7 days
9-Month
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
The Evaporative Demand Drought Index (EDDI) is a drought monitoring tool that shows the anomaly in daily evaporative demand over a given period time. Evaporative demand is the atmospheric influence on the drying of the landscape, or "the thirst of the atmosphere." Unusually high evaporative demand can lead to moisture stress on the land surface, and ultimately to drought—even when precipitation has been near-normal.
EDDI can serve as an indicator of both rapidly evolving "flash" droughts and sustained droughts and can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the GridMET daily dataset, using a 1991-2020 reference period, nonparametric distribution, and Penman-Monteith PET (potential evapotranspiration).
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the NOAA nClimGrid-Daily dataset, using a nonparametric distribution and Hargreaves PET.
This GridMET-based EDDI updates daily, with a latency of 3–5 days.
Daily with a delay of 5-7 days
Updates daily, with a latency of 4-7 days
Updates daily with a delay of 5-7 days
12-Month
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
ED4: Exceptional Drought
Compared to "normal" conditions, evaporative demand is greater than 98% to 100% of historical values. Learn more about these categories.
ED3: Extreme Drought
Compared to "normal" conditions, evaporative demand is greater than 95% to 98% of historical values. Learn more about these categories.
ED2: Severe Drought
Compared to "normal" conditions, evaporative demand is greater than 90% to 95% of historical values. Learn more about these categories.
ED1: Moderate Drought
Compared to "normal" conditions, evaporative demand is greater than 80% to 90% of previous values. Learn more about these categories.
ED0: Abnormally Dry
Compared to "normal" conditions, evaporative demand is greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
EW0: Abnormally Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
EW1: Moderate Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
EW2: Severe Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
EW3: Extreme Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
EW4: Exceptional Wet
Compared to "normal" conditions, current evaporative demand is in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
Drought Conditions
Exceptional Drought (98th–100th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 98% to 100% of historical values. Learn more about these categories.
Extreme Drought (95th–98th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 95% to 98% of historical values. Learn more about these categories.
Severe Drought (90th–95th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 90% to 95% of historical values. Learn more about these categories.
Moderate Drought (80th–90th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 80% to 90% of previous values. Learn more about these categories.
Abnormally Dry (70th–80th Percentile)
Compared to "normal" conditions, evaporative demand is forecast to be greater than 70% to 80% of historical values. Learn more about these categories.
Wet Conditions
Abnormally Wet (20th–30th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 20% to 30% of historical values (i.e., only 20%–30% of previous values had lower evaporative demand). Learn more about these categories.
Moderate Wet (10th–20th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 10% to 20% of historical values (i.e., only 10%–20% of previous values had lower evaporative demand). Learn more about these categories.
Severe Wet (5th–10th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 5% to 10% of historical values (i.e., only 5%–10% of previous values had lower evaporative demand). Learn more about these categories.
Extreme Wet (2nd–5th Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 2% to 5% of historical values (i.e., only 2%–5% of previous values had lower evaporative demand). Learn more about these categories.
Exceptional Wet (0–2nd Percentile)
Compared to "normal" conditions, current evaporative demand is forecast to be in the bottom 0% to 2% of historical values (i.e., less than 2% of previous values had lower evaporative demand). Learn more about these categories.
The Evaporative Demand Drought Index (EDDI) is a drought monitoring tool that shows the anomaly in daily evaporative demand over a given period time. Evaporative demand is the atmospheric influence on the drying of the landscape, or "the thirst of the atmosphere." Unusually high evaporative demand can lead to moisture stress on the land surface, and ultimately to drought—even when precipitation has been near-normal.
EDDI can serve as an indicator of both rapidly evolving "flash" droughts and sustained droughts and can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the GridMET daily dataset, using a 1991-2020 reference period, nonparametric distribution, and Penman-Monteith PET (potential evapotranspiration).
The Evaporative Demand Drought Index (EDDI) is an experimental drought monitoring and early warning guidance tool. It examines anomalous atmospheric evaporative demand (E0; also known as "the thirst of the atmosphere"). EDDI can offer early warning of agricultural drought, hydrologic drought, and fire-weather risk by providing near-real-time information on the emergence or persistence of anomalous evaporative demand in a region. A particular strength of EDDI is in capturing the precursor signals of water stress at weekly to monthly timescales, which makes EDDI a strong tool for preparedness for both flash droughts and ongoing droughts.
The Drought.gov team produces this EDDI product with the Climate Engine tool and the NOAA nClimGrid-Daily dataset, using a nonparametric distribution and Hargreaves PET.
This GridMET-based EDDI updates daily, with a latency of 3–5 days.
Daily with a delay of 5-7 days
Updates daily with a delay of 5-7 days
