Alert archive / Illinois / Mesoscale Discussions / 2009
Mesoscale Discussions in Illinois, December 2009
6 mesoscale discussions in December 2009. 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 2009. Tap one for its archive.
- Mesoscale Discussions
- 6
- Busiest day
- December 9, 20092 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 8, 11:22 AM CST | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, DuPage, Hancock and 21 more | 5 hr |
| Dec 8, 6:00 PM CST | Mesoscale Discussion | SPC | Carroll, Jo Daviess, Stephenson, Winnebago | 5 hr |
| Dec 9, 10:22 AM CST | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, Henderson, Henry and 11 more | 4 hr |
| Dec 23, 6:44 AM CST | Mesoscale Discussion | SPC | Bureau, LaSalle, Lee, Rock Island, Whiteside | 4 hr |
| Dec 23, 12:21 PM CST | Mesoscale Discussion | SPC | Boone, Carroll, DeKalb, Jo Daviess, Kane, Lee and 5 more | 4 hr |
| Dec 23, 6:41 PM CST | Mesoscale Discussion | SPC | Boone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 9 more | 4 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Carroll County5
- Jo Daviess County5
- Lee County5
- Stephenson County5
- Winnebago County5
- Boone County4
- DeKalb County4
- McHenry County4
- Ogle County4
- Whiteside County4
- Bureau County3
- Kane County3
- Rock Island County3
- DuPage County2
- Henderson County2
- Henry County2
- Kendall County2
- Knox County2
- LaSalle County2
- Mercer County2
- Warren County2
- Hancock County1
- McDonough County1
- Marshall County1
- Peoria County1
- Putnam County1
- Stark County1
- Cook County1
- Lake County1
- Will County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive20082010
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.