Alert archive / Illinois / Mesoscale Discussions / 2021
Mesoscale Discussions in Illinois, August 2021
32 mesoscale discussions in August 2021. 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 2021. Tap one for its archive.
- Mesoscale Discussions
- 32
- Busiest day
- August 11, 20217 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 6, 3:23 PM CDT | Mesoscale Discussion | SPC | Boone, Champaign, Cook, DeKalb, DeWitt, DuPage and 20 more | 97 min |
| Aug 8, 11:40 AM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 18 more | 3 hr |
| Aug 8, 3:00 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 36 more | 2 hr |
| Aug 8, 5:47 PM CDT | Mesoscale Discussion | SPC | Alexander, Bond, Champaign, Christian, Clay, Clinton and 27 more | 88 min |
| Aug 9, 12:18 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Cook, DeKalb, DuPage, Grundy and 10 more | 2 hr |
| Aug 9, 5:53 PM CDT | Mesoscale Discussion | SPC | Bureau, Cook, DeKalb, DuPage, Grundy, Kane and 6 more | 67 min |
| Aug 9, 8:33 PM CDT | Mesoscale Discussion | SPC | Bureau, Knox, LaSalle, Livingston, Marshall, Peoria and 4 more | 87 min |
| Aug 10, 10:45 AM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Clinton, Greene and 9 more | 3 hr |
| Aug 10, 2:20 PM CDT | Mesoscale Discussion | SPC | Alexander, Bond, Clay, Clinton, Edwards, Franklin and 21 more | 2 hr |
| Aug 10, 3:10 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, DeKalb, Jo Daviess, Kane, Lake and 6 more | 2 hr |
| Aug 10, 5:51 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, DeKalb, DuPage, Jo Daviess, Kane and 7 more | 84 min |
| Aug 11, 1:20 AM CDT | Mesoscale Discussion | SPC | Bureau, Ford, Fulton, Grundy, Henry, Iroquois and 15 more | 115 min |
| Aug 11, 4:49 AM CDT | Mesoscale Discussion | SPC | Adams | 86 min |
| Aug 11, 6:26 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Fulton, Hancock, Henderson and 12 more | 2 hr |
| Aug 11, 8:34 AM CDT | Mesoscale Discussion | SPC | Bureau, Cook, DeKalb, DuPage, Ford, Grundy and 13 more | 86 min |
| Aug 11, 9:52 AM CDT | Mesoscale Discussion | SPC | Cook, DuPage, Grundy, Kane, Kankakee, Lake and 1 more | 83 min |
| Aug 11, 3:56 PM CDT | Mesoscale Discussion | SPC | Carroll, Hancock, Henderson, Henry, Jo Daviess, Mercer and 2 more | 3 hr |
| Aug 11, 5:40 PM CDT | Mesoscale Discussion | SPC | Carroll, Jo Daviess, Stephenson | 95 min |
| Aug 11, 7:35 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 20 more | 85 min |
| Aug 11, 11:06 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 15 more | 84 min |
| Aug 12, 3:16 AM CDT | Mesoscale Discussion | SPC | Bureau, Ford, Fulton, Grundy, Iroquois, Kankakee and 16 more | 119 min |
| Aug 12, 2:22 PM CDT | Mesoscale Discussion | SPC | Bond, Cass, Champaign, Christian, Clark, Clay and 26 more | 83 min |
| Aug 12, 6:06 PM CDT | Mesoscale Discussion | SPC | Calhoun, Jersey, Madison, Monroe, Saint Clair | 84 min |
| Aug 12, 7:20 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 11 more | 85 min |
| Aug 12, 9:55 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Johnson and 7 more | 95 min |
| Aug 23, 2:18 PM CDT | Mesoscale Discussion | SPC | Bond, Fayette, Greene, Jersey, Macoupin, Madison and 2 more | 117 min |
| Aug 24, 6:00 AM CDT | Mesoscale Discussion | SPC | Jo Daviess | 90 min |
| Aug 24, 3:09 PM CDT | Mesoscale Discussion | SPC | Boone, McHenry, Ogle, Stephenson, Winnebago | 66 min |
| Aug 24, 5:10 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, DeKalb, DuPage, Jo Daviess, Kane and 7 more | 2 hr |
| Aug 24, 8:14 PM CDT | Mesoscale Discussion | SPC | Grundy, Kankakee, Knox, Livingston, Marshall, Peoria and 2 more | 2 hr |
| Aug 25, 4:02 PM CDT | Mesoscale Discussion | SPC | Bureau, Champaign, Clark, Coles, DeWitt, Douglas and 28 more | 88 min |
| Aug 29, 1:18 PM CDT | Mesoscale Discussion | SPC | Bureau, Champaign, Cook, DeKalb, DuPage, Ford and 20 more | 87 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Grundy County12
- Kane County11
- LaSalle County11
- Lee County11
- Marshall County11
- Will County11
- DeKalb County10
- DuPage County10
- Putnam County10
- Woodford County10
- Kankakee County9
- Kendall County9
- Livingston County9
- McHenry County9
- Ogle County9
- Bureau County9
- Stark County9
- Boone County8
- Cook County8
- Lake County8
- Tazewell County8
- Peoria County8
- Carroll County8
- Knox County8
- Winnebago County7
- Bond County7
- Henry County7
- Ford County6
- Iroquois County6
- Logan County6
- McLean County6
- Jersey County6
- Mason County6
- Montgomery County6
- Saint Clair County6
- Jo Daviess County6
- Stephenson County6
- Whiteside County6
- Warren County6
- Champaign County5
62 more counties
- DeWitt County5
- Adams County5
- Clinton County5
- Greene County5
- Macoupin County5
- Madison County5
- Washington County5
- Fulton County5
- Rock Island County5
- Brown County4
- Calhoun County4
- Cass County4
- Christian County4
- Menard County4
- Monroe County4
- Morgan County4
- Schuyler County4
- Scott County4
- Fayette County4
- Jackson County4
- Jefferson County4
- Macon County4
- Moultrie County4
- Perry County4
- Piatt County4
- Alexander County4
- Franklin County4
- Hamilton County4
- Johnson County4
- Pulaski County4
- Saline County4
- Union County4
- Williamson County4
- Mercer County4
- Pike County3
- Randolph County3
- Sangamon County3
- Effingham County3
- McDonough County3
- Marion County3
- Shelby County3
- Clay County3
- Coles County3
- Douglas County3
- Wayne County3
- Gallatin County3
- Hardin County3
- Massac County3
- Pope County3
- White County3
- Vermilion County3
- Cumberland County2
- Jasper County2
- Richland County2
- Hancock County2
- Henderson County2
- Clark County2
- Edgar County2
- Edwards County1
- Wabash County1
- Crawford County1
- Lawrence County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
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. Rebuilt daily.