U.S. Drought Monitor
The U.S. Drought Monitor (USDM) is a weekly map and dataset that classifies the location and severity of drought across the United States, its territories, and tribal areas. It is produced jointly by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the U.S. Department of Agriculture, and the National Oceanic and Atmospheric Administration, drawing on numerous climatic and hydrologic indicators plus local expert input. USDM data and maps serve as an upstream source for KnowWhereGraph.
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