Alert archive / Illinois / Mesoscale Discussions / 2020
Mesoscale Discussions in Illinois, December 2020
3 mesoscale discussions in December 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 December 2020. Tap one for its archive.
- Mesoscale Discussions
- 3
- Busiest day
- December 29, 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 |
|---|---|---|---|---|
| Dec 29, 2:17 PM CST | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, Henry, Jo Daviess and 7 more | 4 hr |
| Dec 29, 3:52 PM CST | Mesoscale Discussion | SPC | Cook, DuPage, Grundy, Kane, Kankakee, Kendall and 5 more | 4 hr |
| Dec 30, 1:15 AM CST | Mesoscale Discussion | SPC | Boone, Cook, DeKalb, DuPage, Kane, Kendall and 4 more | 6 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Boone County2
- DeKalb County2
- Ogle County2
- Winnebago County2
- Cook County2
- DuPage County2
- Kane County2
- Kendall County2
- Lake County2
- McHenry County2
- Bureau County1
- Carroll County1
- Henry County1
- Jo Daviess County1
- Lee County1
- Mercer County1
- Rock Island County1
- Stephenson County1
- Whiteside County1
- Grundy County1
- Kankakee County1
- LaSalle County1
- Livingston County1
- Will County1
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.