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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 9:01 PM CDT | Mesoscale Discussion | SPC | Boone, Cook, DeKalb, DuPage, Kane, Lake and 1 more | 3 hr |
| Sep 5, 3:01 PM CDT | Mesoscale Discussion | SPC | Clark, Coles, Crawford, Cumberland, Edgar, Edwards and 4 more | 119 min |
| Sep 8, 7:33 PM CDT | Mesoscale Discussion | SPC | Mercer, Rock Island | 117 min |
| Sep 10, 2:15 PM CDT | Mesoscale Discussion | SPC | Alexander, Massac, Pulaski | 2 hr |
| Sep 15, 2:35 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Champaign and 40 more | 115 min |
| Sep 20, 6:38 PM CDT | Mesoscale Discussion | SPC | Bond, Christian, Clark, Clay, Clinton, Coles and 33 more | 2 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Coles County3
- Clark County2
- Crawford County2
- Cumberland County2
- Edgar County2
- Edwards County2
- Jasper County2
- Lawrence County2
- Richland County2
- Wabash County2
- Bond County2
- Christian County2
- Douglas County2
- Fayette County2
- Jersey County2
- Macoupin County2
- Madison County2
- Montgomery County2
- Moultrie County2
- Shelby County2
- Boone County1
- Cook County1
- DeKalb County1
- DuPage County1
- Kane County1
- Lake County1
- McHenry County1
- Mercer County1
- Rock Island County1
- Alexander County1
- Massac County1
- Pulaski County1
- Adams County1
- Brown County1
- Calhoun County1
- Cass County1
- Champaign County1
- DeWitt County1
- Ford County1
- Fulton County1
46 more counties
- Greene County1
- Grundy County1
- Hancock County1
- Henderson County1
- Iroquois County1
- Kankakee County1
- Knox County1
- Livingston County1
- Logan County1
- McDonough County1
- McLean County1
- Macon County1
- Marshall County1
- Mason County1
- Menard County1
- Morgan County1
- Peoria County1
- Piatt County1
- Pike County1
- Putnam County1
- Sangamon County1
- Schuyler County1
- Scott County1
- Stark County1
- Tazewell County1
- Warren County1
- Woodford County1
- Clay County1
- Clinton County1
- Effingham County1
- Franklin County1
- Gallatin County1
- Hamilton County1
- Jackson County1
- Jefferson County1
- Marion County1
- Monroe County1
- Perry County1
- Randolph County1
- Saint Clair County1
- Saline County1
- Union County1
- Washington County1
- Wayne County1
- White County1
- Williamson 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.