Alert archive / Severe Thunderstorm Watches / 2020
Severe Thunderstorm Watches in the United States, September 2020
8 severe thunderstorm watches in September 2020. 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
- 8
- Busiest day
- September 1, 20202 severe thunderstorm 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.
- Texas80
- Oklahoma57
- Kansas55
- Nebraska52
- South Dakota51
- North Dakota37
- Missouri37
- Minnesota34
- Pennsylvania33
- Iowa30
- Illinois27
- Arkansas27
- Ohio21
- Colorado21
- Michigan20
- New York19
- West Virginia19
- Wisconsin19
- Indiana19
- Wyoming18
- Kentucky17
- Maryland17
- Virginia16
- Montana16
- New Jersey16
- Mississippi15
- Tennessee12
- Louisiana12
- New Mexico12
- Alabama11
- North Carolina11
- Delaware10
- Massachusetts9
- Connecticut9
- District of Columbia8
- Vermont7
- Georgia5
- South Carolina5
- New Hampshire5
- Rhode Island5
Nearby
Alerts in force nowThe tornado archiveThe radar archive20192021
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.