Alert archive / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in the United States, 2012
20,150 severe thunderstorm warnings in 2012. 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
- 20,150
- Busiest month
- July4,769 severe thunderstorm warnings
- Busiest day
- July 1, 2012420 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.
- Texas2,059
- North Carolina1,059
- Mississippi950
- Kentucky937
- Georgia910
- Tennessee884
- Arkansas855
- Missouri793
- Kansas781
- Oklahoma774
- Alabama772
- South Carolina752
- Virginia740
- Nebraska729
- Florida710
- Indiana667
- Illinois646
- Minnesota606
- Ohio569
- Pennsylvania541
- South Dakota535
- Louisiana527
- Iowa431
- New York422
- Wisconsin369
- West Virginia338
- Michigan308
- Colorado270
- New Mexico265
- Maryland263
- North Dakota246
- Montana235
- Arizona234
- New Jersey160
- Wyoming123
- California108
- Connecticut103
- Massachusetts100
- Maine98
- Vermont81
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowThe tornado archiveThe radar archive20112013
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.