Alert archive / Illinois / Mesoscale Discussions / 2026

Mesoscale Discussions in Illinois, September 2026

6 mesoscale discussions 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 mesoscale discussions reaches back to 2003.

Mesoscale Discussions by county

Each county as a circle sized by its count in September 2026. Tap one for its archive.

Mesoscale Discussions
6
Busiest day
September 5, 20262 mesoscale discussions

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.

IssuedProductOfficeCountiesLasted
Sep 4, 9:01 PM CDTMesoscale DiscussionSPCBoone, Cook, DeKalb, DuPage, Kane, Lake and 1 more3 hr
Sep 5, 3:01 PM CDTMesoscale DiscussionSPCClark, Coles, Crawford, Cumberland, Edgar, Edwards and 4 more119 min
Sep 8, 7:33 PM CDTMesoscale DiscussionSPCMercer, Rock Island117 min
Sep 10, 2:15 PM CDTMesoscale DiscussionSPCAlexander, Massac, Pulaski2 hr
Sep 15, 2:35 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Champaign and 40 more115 min
Sep 20, 6:38 PM CDTMesoscale DiscussionSPCBond, Christian, Clark, Clay, Clinton, Coles and 33 more2 hr

By county

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

46 more counties

Nearby

Alerts in force nowTornadoes on recordThe radar archive2025

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.