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Lightning strikes during a storm in the Sonoran Desert. Photo credit: Shutterstock.
Climate change is causing the probability of extreme events, like drought, to change. A new report by NIDIS and the USDA Climate Hubs provides an overview on how a changing climate is impacting drought assessment and identifies priority actions and research questions.

Advancing Drought Science and Preparedness Across the Nation

The National Integrated Drought Information System (NIDIS) is a multi-agency partnership that coordinates drought monitoring, forecasting, planning, and information at national, tribal, state, and local levels.

Current Conditions and Outlooks

U.S. Drought Monitor Category
Value Map Hex Color % of U.S. Description
D0 - Abnormally Dry #ffff00 17.6 Abnormally Dry Abnormally Dry (D0) indicates a region that is going into or coming out of drought. 
D1 - Moderate Drought #fcd37f 13.0 Moderate Drought Moderate Drought (D1) is the first of four drought categories (D1–D4), according to the U.S. Drought Monitor.
D2 - Severe Drought #ffaa00 9.6 Severe Drought Severe Drought (D2) is the second of four drought categories (D1–D4), according to the U.S. Drought Monitor.
D3 - Extreme Drought #e60000 5.2 Extreme Drought Extreme Drought (D3) is the third of four drought categories (D1–D4), according to the U.S. Drought Monitor.
D4 - Exceptional Drought #730000 1.0 Exceptional Drought Exceptional Drought (D4) is the most intense drought category, according to the U.S. Drought Monitor.
Total Area in Drought (D1–D4) dmtotal 28.8 Total Area in Drought (D1–D4) Percent area of the 50 U.S. states and Puerto Rico that is currently in drought (D1–D4), according to the U.S. Drought Monitor.
Drought Outlook Category
Value Map Hex Color % of U.S.
Drought persists #9b634a 15.7
Drought remains but improves #ded2bc 6.5
Drought removal likely #b2ad69 8.0
Drought development likely #ffde63 0.0

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The Fifth National Climate Assessment (NCA5) represents the latest science in assessing changes in the climate, its national and regional impacts, and options to reduce present and future risk. Every five years, the U.S. Global Change Research Program releases a new National Climate Assessment. The newest assessment, NCA5, is a resource to understand how drought will change as the climate
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Key Points:Climate change is causing the probability of extreme events, like drought, to change, a phenomenon known statistically as “non-stationarity.” Challenges include identifying the differences between permanent change (e.g., long-term trends towards wetter or drier conditions) and temporary anomalies from normal conditions (e.g., drought).Changes in how we assess drought could impact
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The "Dust Bowl" drought of the 1930s brought nearly a decade of dry conditions to the Great Plains, causing many farmers to flee their lands and livelihoods. Looking further back, tree-ring and lake-sediment records indicate that "megadroughts" have occurred in North America over the last thousand years. By looking back at historical data, communities can get a better understanding of how current