Alert archive / Excessive Heat Warnings / 2021
Excessive Heat Warnings in the United States, May 2021
4 excessive heat warnings in May 2021. 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
- 4
- Busiest day
- May 31, 20212 excessive heat warnings
Over time
By day
Days in UTC, the clock the archive keeps.
By state
Every state and territory, with the alerts that covered any part of it. Each state’s page lists every one of them.
- California61
- Arizona24
- Nevada16
- Mississippi14
- Arkansas14
- Oregon14
- Idaho14
- Montana11
- Louisiana10
- Washington9
- Kansas8
- Missouri7
- Oklahoma6
- Texas5
- New Jersey5
- Utah5
- Alabama4
- Florida4
- Pennsylvania4
- New York3
- Wyoming3
- South Carolina2
- Georgia2
- Minnesota2
- New Mexico2
- Connecticut2
- Delaware2
- Illinois1
- Massachusetts1
- Tennessee1
- Colorado1
- Rhode Island1
Nearby
Alerts in force nowThe tornado archiveThe radar archive20202022
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.