Excessive Heat Warnings in the United States
2,720 excessive heat warnings since 1986. Each alert counts once, however many counties it covered. The archive of excessive heat warnings reaches back to 2005.
Excessive Heat Warnings by state
Each state shaded by its count. Tap a state for its own archive.
- Excessive Heat Warnings
- 2,720
- Busiest year
- 2023607 excessive heat warnings
- Average year
- 136over 20 years on file
- Busiest day
- August 11, 202323 excessive heat warnings
Over time
By year
Before late 2005 the archive holds only tornado, severe thunderstorm, flash flood and marine warnings, and from 1997 SPC's watches, so the jump that year is the archive widening, not the weather.
By month of the year
By state
Every state and territory, with the alerts that covered any part of it. Each state’s page lists every one of them.
- California529
- Arizona385
- Texas368
- Arkansas316
- Oklahoma215
- Mississippi196
- Louisiana195
- Missouri185
- Kansas169
- Nevada118
- Puerto Rico113
- Illinois98
- North Carolina91
- Indiana77
- Iowa74
- Florida71
- Pennsylvania71
- Ohio70
- Kentucky69
- New Jersey69
- Oregon68
- Washington67
- Alabama66
- Georgia65
- Tennessee64
- Minnesota57
- Nebraska53
- Maryland50
- South Carolina49
- Delaware48
- U.S. Virgin Islands48
- Virginia47
- Idaho40
- New York36
- Wisconsin33
- Utah28
- Connecticut26
- South Dakota24
- West Virginia24
- District of Columbia22
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Rebuilt daily.