Alert archive / Excessive Heat Warnings

Excessive Heat Warnings in the United States, 2021

167 excessive heat warnings in 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.

AKMEVTNHWAIDMTNDMNILWIMINYRIMAORNVWYSDIAINOHPANJCTCAUTCONEMOKYWVVAMDDEAZNMKSARTNNCSCDCOKLAMSALGAHITXFLPR
Excessive Heat Warnings
167
Busiest month
July56 excessive heat warnings
Busiest day
July 29, 20219 excessive heat warnings

Over time

By month

By state

Every state and territory, with the alerts that covered any part of it. Each state’s page lists every one of them.

The busiest days

Days with the most alerts issued, by UTC date.

  1. July 29, 20219excessive heat warnings
  2. July 30, 20219excessive heat warnings
  3. August 10, 20218excessive heat warnings
  4. June 24, 20217excessive heat warnings
  5. July 7, 20217excessive heat warnings
  6. August 2, 20216excessive heat warnings
  7. June 2, 20215excessive heat warnings
  8. June 10, 20215excessive heat warnings
  9. June 25, 20215excessive heat warnings
  10. July 28, 20215excessive heat warnings
  11. August 13, 20215excessive heat warnings
  12. August 22, 20215excessive heat warnings
  13. June 14, 20214excessive heat warnings
  14. July 27, 20214excessive heat warnings
  15. August 11, 20214excessive heat warnings

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.