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U.S. Billion-Dollar Disaster cost data from NOAA's National Centers for Environmental Information (NCEI), available in text form, was joined to a spatial file of the United States.
Previous 52 weeks of U.S. Drought Monitor data were gridded into a 5 km grid. The total number of weeks were accumulated, throughout the past year, to identify the total number of weeks in drought (D1-D4).