Alert archive / Illinois / Severe Thunderstorm Watches

Severe Thunderstorm Watches in Illinois, 2025

21 severe thunderstorm watches in 2025. 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 watches reaches back to 1997.

Severe Thunderstorm Watches by county

Each county as a circle sized by its count in 2025. Tap one for its archive.

Severe Thunderstorm Watches
21
Busiest month
July6 severe thunderstorm watches
Busiest day
April 29, 20252 severe thunderstorm watches

Over time

By month

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.

IssuedProductOfficeCountiesLasted
Mar 14, 6:55 PM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 22 more8 hr
Apr 4, 5:07 PM CDTSevere Thunderstorm WatchSPCEdwards, Franklin, Hamilton, Jefferson, Perry, Randolph and 4 more6 hr
Apr 10, 2:22 PM CDTSevere Thunderstorm WatchSPCAlexander, Gallatin, Hardin, Johnson, Massac, Pope and 4 more5 hr
Apr 29, 8:56 AM CDTSevere Thunderstorm WatchSPCAlexander, Bond, Clinton, Fayette, Jackson, Madison and 8 more6 hr
Apr 29, 1:29 PM CDTSevere Thunderstorm WatchSPCClay, Crawford, Edwards, Franklin, Gallatin, Hamilton and 13 more4 hr
May 8, 12:25 PM CDTSevere Thunderstorm WatchSPCGallatin, Hardin, Massac, Pope8 hr
May 16, 2:28 AM CDTSevere Thunderstorm WatchSPCAlexander, Gallatin, Hardin, Johnson, Massac, Pope and 4 more9 hr
May 16, 5:47 PM CDTSevere Thunderstorm WatchSPCFord, Grundy, Iroquois, Kankakee, Livingston3 hr
Jun 3, 4:41 PM CDTSevere Thunderstorm WatchSPCAdams, Boone, Brown, Bureau, Carroll, DeKalb and 22 more6 hr
Jun 8, 2:30 PM CDTSevere Thunderstorm WatchSPCCalhoun, Greene, Jersey, Pike8 hr
Jul 11, 1:17 AM CDTSevere Thunderstorm WatchSPCHenderson, Mercer, Rock Island, Warren3 hr
Jul 11, 2:19 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Pike8 hr
Jul 16, 12:37 PM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 17 more5 hr
Jul 20, 6:09 PM CDTSevere Thunderstorm WatchSPCChristian, Clark, Clay, Crawford, Cumberland, Edwards and 6 more4 hr
Jul 24, 2:31 PM CDTSevere Thunderstorm WatchSPCBureau, Cook, DuPage, Ford, Grundy, Iroquois and 13 more5 hr
Jul 28, 10:07 PM CDTSevere Thunderstorm WatchSPCMercer, Rock Island6 hr
Aug 15, 2:16 PM CDTSevere Thunderstorm WatchSPCCarroll, Henry, Jo Daviess, Mercer, Rock Island, Whiteside6 hr
Aug 15, 6:46 PM CDTSevere Thunderstorm WatchSPCBureau, Knox, LaSalle, Lee, Marshall, Ogle and 6 more2 hr
Aug 16, 1:56 PM CDTSevere Thunderstorm WatchSPCBoone, Cook, DeKalb, DuPage, Kane, Kendall and 6 more5 hr
Aug 18, 12:13 PM CDTSevere Thunderstorm WatchSPCBoone, Bureau, Carroll, Cook, DeKalb, DuPage and 15 more9 hr
Nov 18, 4:28 PM CSTSevere Thunderstorm WatchSPCAlexander, Massac, Pulaski6 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

44 more counties

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordThe radar archive20242026

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.