Alert archive / Illinois / Mesoscale Discussions / 2020
Mesoscale Discussions in Illinois, September 2020
6 mesoscale discussions in September 2020. 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 2020. Tap one for its archive.
- Mesoscale Discussions
- 6
- Busiest day
- September 6, 20202 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 6, 2:32 AM CDT | Mesoscale Discussion | SPC | Carroll, Henderson, Henry, Jo Daviess, Knox, Lee and 4 more | 88 min |
| Sep 6, 5:30 AM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Henry, Jo Daviess, Knox, Mercer and 5 more | 90 min |
| Sep 6, 9:32 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 13 more | 118 min |
| Sep 7, 3:59 PM CDT | Mesoscale Discussion | SPC | Coles, Douglas, Edgar, Moultrie | 2 hr |
| Sep 7, 7:14 PM CDT | Mesoscale Discussion | SPC | Fulton, Hancock, Henderson, McDonough, Warren | 2 hr |
| Sep 8, 3:01 PM CDT | Mesoscale Discussion | SPC | Calhoun, Christian, Greene, Jersey, Macoupin, Madison and 3 more | 119 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Carroll County3
- Henry County3
- Rock Island County3
- Whiteside County3
- Henderson County2
- Jo Daviess County2
- Knox County2
- Lee County2
- Mercer County2
- Warren County2
- Bureau County2
- Stark County2
- Peoria County1
- Stephenson County1
- Boone County1
- Cook County1
- DeKalb County1
- DuPage County1
- Kane County1
- Kendall County1
- Lake County1
- LaSalle County1
- McHenry County1
- Ogle County1
- Putnam County1
- Winnebago County1
- Coles County1
- Douglas County1
- Edgar County1
- Moultrie County1
- Fulton County1
- Hancock County1
- McDonough County1
- Calhoun County1
- Christian County1
- Greene County1
- Jersey County1
- Macoupin County1
- Madison County1
- Montgomery County1
2 more counties
Nearby
Alerts in force nowTornadoes on recordThe radar archive20192021
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.