National Weather Service United States Department of Commerce


An unusually strong high pressure area aloft resulted in a widespread dangerous heat wave across the central United States the week of August 20th. Unusually high humidity levels for such extreme temperatures resulted in heat indices rarely experienced across portions of the Midwest, in excess of 120 degrees in many areas. Little relief was afforded at night during the peak of the heat wave, with the heat index only falling into the 80s in some cases. 

Extent of Excessive Heat Warnings (purple) on Thursday, August 24
Extent of Excessive Heat Warnings (purple shaded areas) on Thursday, August 24th
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