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National Integrated Drought Information System
U.S. Geological Survey, U.S. Drought Monitor
Streamflow data were available in a GIS format from U.S. Geological Survey (USGS) WaterWatch.
USDM data from the National Drought Mitigation Center were available in a GIS format.
Temperature and precipitation data from NOAA's Climate Prediction Center (CPC) were available in a GIS format.