Extreme Heat Watches in the United States
252 extreme heat watches since 1986. Each alert counts once, however many counties it covered. The archive of extreme heat watches reaches back to 2005.
Extreme Heat Watches by state
Each state shaded by its count. Tap a state for its own archive.
- Extreme Heat Watches
- 252
- Busiest year
- 2026135 extreme heat watches
- Average year
- 126over 2 years on file
- Busiest day
- June 27, 202614 extreme heat watches
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.
- California41
- Arizona34
- Missouri24
- Iowa19
- Minnesota19
- Illinois17
- Wisconsin17
- Georgia16
- Oregon15
- North Carolina13
- Nebraska13
- Washington13
- Kansas12
- Florida10
- Pennsylvania10
- South Carolina10
- Nevada10
- Michigan10
- Virginia9
- New York9
- Montana9
- Maryland9
- Mississippi7
- New Jersey7
- Ohio7
- West Virginia7
- Utah6
- Arkansas6
- Indiana6
- Connecticut6
- Kentucky5
- Wyoming5
- District of Columbia5
- Texas4
- Louisiana4
- Tennessee4
- Vermont4
- South Dakota4
- Maine4
- Delaware4
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.