Alert archive

Heat Advisories in the United States

13,617 heat advisories since 1986. Each alert counts once, however many counties it covered. The archive of heat advisories reaches back to 2005.

Heat Advisories by state

Each state shaded by its count. Tap a state for its own archive.

AKMEVTNHWAIDMTNDMNILWIMINYRIMAORNVWYSDIAINOHPANJCTCAUTCONEMOKYWVVAMDDEAZNMKSARTNNCSCDCOKLAMSALGAHITXFLPR
Heat Advisories
13,617
Busiest year
20231,559 heat advisories
Average year
619over 22 years on file
Busiest day
July 15, 202443 heat advisories

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.

12 more states

The busiest days

Days with the most alerts issued, by UTC date.

  1. July 15, 202443heat advisories
  2. July 20, 202541heat advisories
  3. July 26, 202541heat advisories
  4. August 10, 202140heat advisories
  5. July 19, 202638heat advisories
  6. July 14, 202437heat advisories
  7. July 31, 202437heat advisories
  8. June 13, 202236heat advisories
  9. August 1, 202436heat advisories
  10. July 27, 202536heat advisories
  11. July 26, 202335heat advisories
  12. July 28, 202535heat advisories
  13. June 12, 202234heat advisories
  14. July 22, 202534heat advisories
  15. July 19, 202333heat advisories

Nearby

Alerts in force nowThe tornado archiveThe radar archive

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.