Alert archive / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in the United States, 2007
21,141 severe thunderstorm warnings in 2007. Each alert counts once, however many counties it covered. The archive of severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by state
Each state shaded by its count. Tap a state for its own archive.
- Severe Thunderstorm Warnings
- 21,141
- Busiest month
- June5,407 severe thunderstorm warnings
- Busiest day
- April 3, 2007386 severe thunderstorm warnings
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.
- Texas2,549
- Nebraska1,110
- Kansas884
- Oklahoma834
- Georgia826
- North Carolina757
- South Dakota716
- Pennsylvania689
- Iowa681
- Florida648
- Minnesota640
- Mississippi598
- New York592
- Virginia589
- Ohio584
- Missouri564
- Illinois555
- Michigan514
- Colorado514
- Alabama498
- South Carolina485
- Kentucky481
- Arkansas467
- Wisconsin466
- North Dakota457
- Montana455
- Tennessee426
- Louisiana400
- New Mexico398
- Indiana316
- West Virginia258
- Arizona256
- Maine219
- Wyoming218
- Maryland161
- New Hampshire151
- Massachusetts117
- New Jersey111
- Vermont105
- California95
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowThe tornado archiveThe radar archive20062008
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.