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Daily historic probability of severe weather within 25 miles of each map grid point during a 30-year base period for March 1-June 30, the peak of the yearly tornado season (April-June). Darker colors represent a higher number of severe weather reports. As spring progresses, the highest chance of severe weather spreads north and east across the Plains, the Midwest, and Southeast. Map by NOAA Climate.gov based on data from the Storm Prediction Center (SPC). Individual maps available from Data Snapshots.