Alert archive / Illinois / Mesoscale Discussions / 2026
Mesoscale Discussions in Illinois, May 2026
15 mesoscale discussions in May 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 May 2026. Tap one for its archive.
- Mesoscale Discussions
- 15
- Busiest day
- May 4, 20264 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 |
|---|---|---|---|---|
| May 3, 8:49 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 29 more | 116 min |
| May 4, 3:42 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 28 more | 2 hr |
| May 4, 6:29 PM CDT | Mesoscale Discussion | SPC | Bond, Christian, Clark, Clay, Clinton, Coles and 22 more | 3 hr |
| May 4, 6:34 PM CDT | Mesoscale Discussion | SPC | Adams, Hancock, Henderson, McDonough, Pike | 86 min |
| May 4, 9:31 PM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Coles, Crawford, Cumberland, DeWitt and 14 more | 119 min |
| May 15, 9:07 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Jo Daviess, Ogle, Stephenson, Winnebago | 113 min |
| May 16, 12:29 AM CDT | Mesoscale Discussion | SPC | Boone, McHenry, Stephenson, Winnebago | 91 min |
| May 16, 2:13 PM CDT | Mesoscale Discussion | SPC | Edwards, Franklin, Gallatin, Hamilton, Hardin, Jefferson and 10 more | 2 hr |
| May 16, 5:10 PM CDT | Mesoscale Discussion | SPC | Clay, Edwards, Richland, Wabash, Wayne | 65 min |
| May 18, 6:51 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Fulton, Greene and 15 more | 84 min |
| May 18, 8:40 AM CDT | Mesoscale Discussion | SPC | Cass, Champaign, Christian, Coles, Cumberland, DeWitt and 27 more | 2 hr |
| May 18, 11:38 AM CDT | Mesoscale Discussion | SPC | Lake | 67 min |
| May 19, 12:31 PM CDT | Mesoscale Discussion | SPC | Alexander, Clark, Clay, Crawford, Edwards, Franklin and 19 more | 119 min |
| May 31, 2:30 PM CDT | Mesoscale Discussion | SPC | Alexander, Pulaski, Union | 2 hr |
| May 31, 4:52 PM CDT | Mesoscale Discussion | SPC | Alexander, Johnson, Massac, Pope, Pulaski, Union | 113 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Wayne County5
- Richland County5
- Clay County4
- Coles County4
- Cumberland County4
- Jasper County4
- Jefferson County4
- Macoupin County4
- Moultrie County4
- Shelby County4
- Edwards County4
- Wabash County4
- Adams County3
- Cass County3
- Christian County3
- Effingham County3
- Greene County3
- Jersey County3
- Macon County3
- Madison County3
- Menard County3
- Montgomery County3
- Morgan County3
- Perry County3
- Pike County3
- Sangamon County3
- Boone County3
- Ford County3
- Iroquois County3
- Livingston County3
- McLean County3
- Stephenson County3
- Winnebago County3
- Clark County3
- Crawford County3
- Douglas County3
- Edgar County3
- Lawrence County3
- White County3
- Johnson County3
62 more counties
- Pope County3
- Alexander County3
- Pulaski County3
- Union County3
- Bond County2
- Brown County2
- Calhoun County2
- Clinton County2
- Fayette County2
- Marion County2
- Saint Clair County2
- Schuyler County2
- Scott County2
- Washington County2
- Carroll County2
- Grundy County2
- Kankakee County2
- Knox County2
- Lake County2
- McHenry County2
- Marshall County2
- Ogle County2
- Peoria County2
- Tazewell County2
- Warren County2
- Will County2
- Woodford County2
- Hancock County2
- Henderson County2
- McDonough County2
- Champaign County2
- DeWitt County2
- Piatt County2
- Vermilion County2
- Franklin County2
- Gallatin County2
- Hamilton County2
- Hardin County2
- Saline County2
- Williamson County2
- Mason County2
- Massac County2
- Monroe County1
- Randolph County1
- Bureau County1
- Cook County1
- DeKalb County1
- DuPage County1
- Henry County1
- Kane County1
- Kendall County1
- LaSalle County1
- Lee County1
- Mercer County1
- Putnam County1
- Rock Island County1
- Stark County1
- Whiteside County1
- Jo Daviess County1
- Fulton County1
- Logan County1
- Jackson 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.