Severe Thunderstorm Warnings in Illinois
21,583 severe thunderstorm warnings since 1986. 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 since 1986. Tap one for its archive.
- Severe Thunderstorm Warnings
- 21,583
- Busiest year
- 20261,027 severe thunderstorm warnings
- Average year
- 526over 41 years on file
Over time
By year
Before October 2007 these were issued for whole counties, and a storm crossing three counties was often three warnings; since then one polygon follows the storm. The count changed with the practice, not only with the weather.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Cook County883
- Will County781
- Madison County729
- Saint Clair County717
- Sangamon County652
- Fulton County617
- Tazewell County617
- McLean County606
- LaSalle County589
- Rock Island County563
- Pike County561
- Mason County547
- Logan County542
- Calhoun County541
- Peoria County541
- DeKalb County536
- Champaign County534
- Adams County532
- Macon County531
- Kane County528
- Christian County527
- Iroquois County514
- Macoupin County514
- DuPage County510
- Shelby County507
- Livingston County498
- Henry County497
- Monroe County496
- Ogle County494
- Whiteside County489
- Morgan County473
- Woodford County466
- Vermilion County462
- Jersey County459
- Lee County459
- Montgomery County459
- Jackson County458
- Clinton County451
- Kankakee County449
- Union County443
62 more counties
- Knox County443
- Kendall County441
- Jasper County441
- Coles County440
- Hancock County438
- Piatt County437
- Randolph County429
- McHenry County427
- Edgar County426
- Alexander County422
- Bureau County417
- Fayette County417
- Menard County416
- Grundy County408
- Mercer County408
- Winnebago County404
- Pope County403
- Wayne County401
- Cass County399
- Williamson County398
- Jo Daviess County394
- Greene County392
- Clark County391
- DeWitt County391
- Johnson County390
- Pulaski County389
- Washington County388
- Ford County384
- Crawford County373
- Moultrie County371
- Henderson County369
- Carroll County368
- Warren County368
- White County366
- Bond County365
- Massac County364
- Franklin County362
- Lake County360
- McDonough County359
- Boone County358
- Schuyler County357
- Cumberland County353
- Clay County351
- Jefferson County350
- Richland County349
- Effingham County347
- Douglas County345
- Marion County337
- Stephenson County334
- Marshall County325
- Lawrence County318
- Saline County316
- Brown County305
- Perry County305
- Stark County302
- Hamilton County295
- Scott County282
- Wabash County281
- Gallatin County278
- Edwards County271
- Putnam County216
- Hardin County197
The latest severe thunderstorm warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 10:47 PM CDT | Severe Thunderstorm Warning | LSX | Monroe | 33 min |
| Sep 20, 10:27 PM CDT | Severe Thunderstorm Warning | ILX | Coles, Cumberland, Shelby | 63 min |
| Sep 20, 7:27 PM CDT | Severe Thunderstorm Warning | ILX | Crawford, Lawrence | 33 min |
| Sep 20, 6:03 PM CDT | Severe Thunderstorm Warning | LSX | Fayette | 48 min |
| Sep 20, 2:21 AM CDT | Severe Thunderstorm Warning | DVN | Rock Island, Whiteside | 27 min |
| Sep 20, 1:18 AM CDT | Severe Thunderstorm Warning | DVN | Mercer, Rock Island | 57 min |
| Sep 18, 4:52 PM CDT | Severe Thunderstorm Warning | PAH | Edwards, Wabash | 23 min |
| Sep 18, 3:31 PM CDT | Severe Thunderstorm Warning | ILX | Crawford, Lawrence | 59 min |
| Sep 15, 8:55 PM CDT | Severe Thunderstorm Warning | ILX | Peoria | 50 min |
| Sep 15, 6:50 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Pike | 36 min |
| Sep 15, 6:43 PM CDT | Severe Thunderstorm Warning | ILX | Marshall, Woodford | 36 min |
| Sep 15, 6:13 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Pike | 47 min |
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. Rebuilt daily.