Alert archive / Severe Thunderstorm Warnings / 2018
Severe Thunderstorm Warnings in the United States, September 2018
771 severe thunderstorm warnings in September 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
- 771
- Busiest day
- September 1, 2018121 severe thunderstorm warnings
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.
- 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
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.