Alert archive / Severe Thunderstorm Watches
Severe Thunderstorm Watches in the United States, 2021
395 severe thunderstorm watches in 2021. Each alert counts once, however many counties it covered. The archive of severe thunderstorm watches reaches back to 1997.
Severe Thunderstorm Watches by state
Each state shaded by its count. Tap a state for its own archive.
- Severe Thunderstorm Watches
- 395
- Busiest month
- June90 severe thunderstorm watches
- Busiest day
- May 4, 202114 severe thunderstorm watches
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.
- Texas89
- Kansas59
- Nebraska52
- Pennsylvania49
- Missouri45
- Oklahoma41
- Illinois36
- South Dakota34
- New York32
- Iowa32
- Minnesota30
- Arkansas25
- Virginia25
- West Virginia25
- Colorado24
- Maryland23
- Indiana22
- New Jersey21
- Wisconsin21
- Ohio20
- Michigan20
- Louisiana18
- Alabama18
- New Mexico18
- Connecticut18
- North Dakota17
- Massachusetts16
- Mississippi14
- North Carolina14
- Delaware14
- Tennessee13
- Kentucky13
- District of Columbia13
- Georgia12
- Montana11
- Vermont11
- Florida7
- New Hampshire6
- Wyoming6
- Rhode Island6
4 more states
The busiest days
Days with the most alerts issued, by UTC date.
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. Warning verification from the Mesonet's Cow. Rebuilt daily.