Alert archive / Illinois / Severe Thunderstorm Warnings / 2026
Severe Thunderstorm Warnings in Illinois, September 2026
16 severe thunderstorm warnings in September 2026. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in September 2026. Tap one for its archive.
- Severe Thunderstorm Warnings
- 16
- Busiest day
- September 15, 20264 severe thunderstorm warnings
Over time
By day
Days in UTC, the clock the archive keeps.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 6:56 PM CDT | Severe Thunderstorm Warning | PAH | Saline, Williamson | 34 min |
| Sep 9, 11:37 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 27 min |
| Sep 11, 11:41 PM CDT | Severe Thunderstorm Warning | PAH | Edwards, Wabash, White | 34 min |
| Sep 15, 5:42 PM CDT | Severe Thunderstorm Warning | ILX | McLean, Tazewell, Woodford | 48 min |
| Sep 15, 6:13 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Pike | 47 min |
| Sep 15, 6:43 PM CDT | Severe Thunderstorm Warning | ILX | Marshall, Woodford | 36 min |
| Sep 15, 6:50 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Pike | 36 min |
| Sep 15, 8:55 PM CDT | Severe Thunderstorm Warning | ILX | Peoria | 50 min |
| Sep 18, 3:31 PM CDT | Severe Thunderstorm Warning | ILX | Crawford, Lawrence | 59 min |
| Sep 18, 4:52 PM CDT | Severe Thunderstorm Warning | PAH | Edwards, Wabash | 23 min |
| Sep 20, 1:18 AM CDT | Severe Thunderstorm Warning | DVN | Mercer, Rock Island | 57 min |
| Sep 20, 2:21 AM CDT | Severe Thunderstorm Warning | DVN | Rock Island, Whiteside | 27 min |
| Sep 20, 6:03 PM CDT | Severe Thunderstorm Warning | LSX | Fayette | 48 min |
| Sep 20, 7:27 PM CDT | Severe Thunderstorm Warning | ILX | Crawford, Lawrence | 33 min |
| Sep 20, 10:27 PM CDT | Severe Thunderstorm Warning | ILX | Coles, Cumberland, Shelby | 63 min |
| Sep 20, 10:47 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 33 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Monroe County2
- Edwards County2
- Wabash County2
- Woodford County2
- Adams County2
- Pike County2
- Crawford County2
- Lawrence County2
- Rock Island County2
- Saline County1
- Williamson County1
- White County1
- McLean County1
- Tazewell County1
- Marshall County1
- Peoria County1
- Mercer County1
- Whiteside County1
- Fayette County1
- Coles County1
- Cumberland County1
- Shelby County1
Nearby
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.