Alert archive / Severe Thunderstorm Warnings
Severe Thunderstorm Warnings in the United States, 2018
17,690 severe thunderstorm warnings in 2018. 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
- 17,690
- Busiest month
- June4,561 severe thunderstorm warnings
- Busiest day
- June 24, 2018289 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.
- Texas1,478
- Kansas1,362
- Oklahoma932
- Nebraska853
- Colorado809
- Missouri798
- Arkansas712
- Georgia698
- South Dakota621
- North Carolina608
- Iowa597
- Mississippi589
- Kentucky573
- Tennessee546
- Florida538
- Minnesota492
- Illinois476
- Virginia471
- Arizona460
- South Carolina438
- New Mexico438
- Wyoming407
- Louisiana388
- Alabama382
- North Dakota370
- Pennsylvania364
- Ohio338
- Montana334
- Wisconsin326
- Indiana305
- New York282
- Michigan253
- West Virginia219
- Maryland194
- Nevada104
- Massachusetts100
- Idaho91
- Maine90
- New Jersey75
- California71
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowThe tornado archiveThe radar archive20172019
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.