Alert archive / Extreme Heat Watches / 2025
Extreme Heat Watches in the United States, August 2025
21 extreme heat watches in August 2025. 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
- 21
- Busiest day
- August 18, 20256 extreme heat watches
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.
- Arizona19
- California18
- Oregon11
- Minnesota10
- Iowa10
- Nebraska10
- North Carolina9
- Washington9
- Missouri9
- Illinois8
- Wisconsin8
- Georgia7
- Virginia6
- Florida6
- Pennsylvania6
- Ohio6
- West Virginia6
- Nevada5
- New Jersey4
- Maryland4
- New York4
- South Carolina4
- Connecticut3
- Michigan3
- Mississippi3
- Indiana3
- Kansas3
- South Dakota3
- Kentucky3
- District of Columbia3
- Delaware2
- Vermont2
- Maine2
- Idaho2
- Tennessee2
- Arkansas2
- Massachusetts1
- Utah1
- New Mexico1
- New Hampshire1
3 more states
Nearby
Alerts in force nowThe tornado archiveThe radar archive20242026
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. Warning verification from the Mesonet's Cow. Rebuilt daily.