The Evaporative Demand Drought Index (EDDI) is an experimental tool that can serve as an indicator of both rapidly evolving "flash" droughts (developing over a few weeks) and sustained droughts (developing over months but lasting up to years).
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Because of the far-reaching societal and economic impacts of drought, there is considerable interest in determining how much precipitation is required to end a drought as well as the probability that a region may receive the necessary amount of precipitation. Ending a hydrological drought requires that the moisture needs associated with recharge, demand and runoff have been brought back to normal or above normal.
Drought Termination and Amelioration data and maps are available for:...
National Weather Service (NWS) Climate Prediction Center (CPC) generates outlooks that view probabilities of above- or below-normal temperature and precipitation maps at the 6-10 Day, 8-14 Day, Week 3-4, One Month, and Three Month timescales.
The Climate Prediction Center has developed monthly and seasonal tools are based on the Constructed Analog on Soil Moisture (CAS). Note that both of these are only forecast tools. They may be used in making the official outlooks that go out to the public, but are not official forecasts in their own right.
El Niño and La Niña are the warm and cool phases of a recurring climate pattern across the tropical Pacific—the El Niño-Southern Oscillation, or “ENSO” for short. The pattern can shift back and forth irregularly every two to seven years, and each phase triggers predictable disruptions of temperature, precipitation, and winds. These changes disrupt the large-scale air movements in the tropics, triggering a cascade of global side effects.
NOAA’s El Niño and La Niña Portal provides – ...
The Climate Prediction Center has developed a soil moisture tool for the next 2 weeks based on the National Weather Service Global Forecast System (GFS) model. Note that these are only forecast tools. They may be used in making the official outlooks that go out to the public, but are not official forecasts in their own right. The GFS bias corrected ensemble forecasts (daily precipitation and temperature at 00Z & 12Z) for Week 1 and Week 2 are used to drive the soil moisture model.
Forecasts and current conditions for soil moisture (SM) and cumulative runoff. Forecast maps include precentiles at one-, two- and three-month leads
The Advanced Hydrologic Prediction Service (AHPS) provides a web-based suite of accurate and information-rich forecast products. Magnitude and uncertainty of occurance of floods or droughts, from hours to days and months, in advance are derived from United States Geological Survey’s (USGS) real-time river gauge data and weather forecasts. There are nearly 9,000 stations throughout the United States and an interactive online map that allows the user to see the status of stations in real-time...
Available in spring and summer for the western U.S. Monthly streamflow maps compare precent of monthly average flow to their respective 1981-2010 average.
Data from the USDA for streamflow, forecasts, reservoir storage and other hydrologic information for the Western United States.