Alert archive / Illinois / Mesoscale Discussions / 2026
Mesoscale Discussions in Illinois, August 2026
33 mesoscale discussions in August 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 August 2026. Tap one for its archive.
- Mesoscale Discussions
- 33
- Busiest day
- August 10, 20265 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 |
|---|---|---|---|---|
| Aug 7, 8:48 PM CDT | Mesoscale Discussion | SPC | Hancock | 87 min |
| Aug 9, 9:20 AM CDT | Mesoscale Discussion | SPC | McHenry | 85 min |
| Aug 9, 1:57 PM CDT | Mesoscale Discussion | SPC | Cook, DuPage | 93 min |
| Aug 9, 8:14 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 29 more | 2 hr |
| Aug 9, 10:53 PM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Cook, DeKalb, DuPage, Grundy and 18 more | 2 hr |
| Aug 10, 2:15 AM CDT | Mesoscale Discussion | SPC | Iroquois, Kankakee | 2 hr |
| Aug 10, 12:47 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, DuPage, Grundy and 14 more | 2 hr |
| Aug 10, 5:15 PM CDT | Mesoscale Discussion | SPC | Cook, DeKalb, DuPage, Grundy, Kane, Kankakee and 3 more | 2 hr |
| Aug 10, 9:07 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Jo Daviess, Lee, Ogle, Stephenson and 2 more | 113 min |
| Aug 11, 9:00 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 27 more | 2 hr |
| Aug 11, 2:28 PM CDT | Mesoscale Discussion | SPC | Champaign, Douglas, Edgar, Vermilion | 2 hr |
| Aug 11, 5:24 PM CDT | Mesoscale Discussion | SPC | Clark, Crawford | 2 hr |
| Aug 11, 8:04 PM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Cook, DeKalb, DuPage, Ford and 21 more | 2 hr |
| Aug 12, 9:04 AM CDT | Mesoscale Discussion | SPC | Bureau, Champaign, DeWitt, Douglas, Edgar, Ford and 20 more | 116 min |
| Aug 12, 12:12 PM CDT | Mesoscale Discussion | SPC | Cass, Champaign, Christian, Clark, Coles, Cumberland and 25 more | 63 min |
| Aug 12, 4:33 PM CDT | Mesoscale Discussion | SPC | Alexander, Clinton, Franklin, Gallatin, Hamilton, Hardin and 17 more | 117 min |
| Aug 13, 10:28 AM CDT | Mesoscale Discussion | SPC | Champaign, DeWitt, Ford, Fulton, Hancock, Henderson and 21 more | 3 hr |
| Aug 13, 3:22 PM CDT | Mesoscale Discussion | SPC | Edgar | 83 min |
| Aug 13, 11:03 PM CDT | Mesoscale Discussion | SPC | Bureau, Cass, Champaign, Clark, Coles, DeWitt and 33 more | 117 min |
| Aug 14, 11:42 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Fulton, Hancock, Henderson and 8 more | 2 hr |
| Aug 15, 4:02 PM CDT | Mesoscale Discussion | SPC | Adams, Hancock, Henderson | 118 min |
| Aug 16, 12:12 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Christian, Fulton, Hancock and 10 more | 93 min |
| Aug 16, 3:11 PM CDT | Mesoscale Discussion | SPC | Calhoun, Clinton, Jackson, Jersey, Macoupin, Madison and 5 more | 2 hr |
| Aug 16, 8:27 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clinton, Jackson, Jersey, Macoupin and 6 more | 93 min |
| Aug 18, 5:29 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Jo Daviess, McHenry, Ogle, Stephenson and 1 more | 2 hr |
| Aug 19, 4:52 PM CDT | Mesoscale Discussion | SPC | Champaign, DeWitt, Ford, Fulton, Grundy, Henderson and 14 more | 83 min |
| Aug 19, 8:52 PM CDT | Mesoscale Discussion | SPC | Alexander, Clay, Clinton, Edwards, Franklin, Gallatin and 21 more | 83 min |
| Aug 19, 11:04 PM CDT | Mesoscale Discussion | SPC | Alexander, Massac, Pope, Pulaski | 86 min |
| Aug 20, 1:49 AM CDT | Mesoscale Discussion | SPC | Alexander, Massac, Pulaski | 86 min |
| Aug 21, 2:22 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, Fulton, Grundy and 23 more | 113 min |
| Aug 21, 6:13 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, Kane, Kendall and 8 more | 2 hr |
| Aug 21, 11:43 PM CDT | Mesoscale Discussion | SPC | Cass, Champaign, DeWitt, Logan, McLean, Macon and 3 more | 92 min |
| Aug 26, 12:22 PM CDT | Mesoscale Discussion | SPC | Champaign, Douglas, Edgar, Ford, Iroquois, Kankakee and 2 more | 113 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Kankakee County11
- Grundy County10
- Marshall County10
- Putnam County10
- Stark County10
- Whiteside County10
- Woodford County10
- Bureau County9
- Carroll County9
- Kendall County9
- Knox County9
- LaSalle County9
- Lee County9
- Livingston County9
- Ogle County9
- Peoria County9
- DeKalb County8
- Fulton County8
- Henry County8
- Kane County8
- Stephenson County8
- Tazewell County8
- Winnebago County8
- Iroquois County8
- McLean County8
- Champaign County8
- Hancock County7
- DuPage County7
- Boone County7
- Henderson County7
- Jo Daviess County7
- McDonough County7
- Rock Island County7
- Will County7
- Ford County7
- Vermilion County7
- Mason County7
- Cook County6
- Mercer County6
- Warren County6
58 more counties
- Edgar County6
- DeWitt County6
- Piatt County6
- Menard County6
- McHenry County5
- Douglas County5
- Cass County5
- Logan County5
- Macon County5
- Schuyler County5
- Alexander County4
- Clinton County4
- Jackson County4
- Massac County4
- Monroe County4
- Perry County4
- Pulaski County4
- Randolph County4
- Saint Clair County4
- Washington County4
- Lake County3
- Clark County3
- Sangamon County3
- Madison County3
- Pope County3
- Adams County3
- Christian County2
- Coles County2
- Moultrie County2
- Franklin County2
- Gallatin County2
- Hamilton County2
- Hardin County2
- Jefferson County2
- Johnson County2
- Saline County2
- Union County2
- Wayne County2
- White County2
- Williamson County2
- Brown County2
- Morgan County2
- Pike County2
- Scott County2
- Calhoun County2
- Jersey County2
- Macoupin County2
- Crawford County1
- Cumberland County1
- Effingham County1
- Jasper County1
- Shelby County1
- Bond County1
- Clay County1
- Edwards County1
- Marion County1
- Richland County1
- Wabash 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.