Alert archive / Illinois / Mesoscale Discussions / 2021
Mesoscale Discussions in Illinois, September 2021
4 mesoscale discussions in September 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 September 2021. Tap one for its archive.
- Mesoscale Discussions
- 4
- Busiest day
- September 7, 20213 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 7, 12:25 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 9 more | 65 min |
| Sep 7, 3:14 PM CDT | Mesoscale Discussion | SPC | DuPage, Ford, Grundy, Iroquois, Kankakee, Kendall and 11 more | 91 min |
| Sep 7, 5:25 PM CDT | Mesoscale Discussion | SPC | Champaign, Vermilion | 95 min |
| Sep 14, 3:18 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Champaign, Christian, Clinton, Coles and 28 more | 117 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- DuPage County2
- Kendall County2
- Ford County2
- Iroquois County2
- Kankakee County2
- Livingston County2
- McLean County2
- Champaign County2
- Vermilion County2
- Boone County1
- Bureau County1
- Carroll County1
- Cook County1
- DeKalb County1
- Kane County1
- Lake County1
- Lee County1
- McHenry County1
- Ogle County1
- Stephenson County1
- Whiteside County1
- Winnebago County1
- Grundy County1
- Knox County1
- LaSalle County1
- Marshall County1
- Peoria County1
- Putnam County1
- Stark County1
- Tazewell County1
- Will County1
- Woodford County1
- Bond County1
- Calhoun County1
- Christian County1
- Clinton County1
- Coles County1
- Cumberland County1
- DeWitt County1
- Douglas 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.