Alert archive / Illinois / Winter Weather Advisories / 2021
Winter Weather Advisories in Illinois, December 2021
3 winter weather advisories in December 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 winter weather advisories reaches back to 2005.
Winter Weather Advisories by county
Each county as a circle sized by its count in December 2021. Tap one for its archive.
- Winter Weather Advisories
- 3
- Busiest day
- December 27, 20212 winter weather advisories
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 27, 2:03 PM CST | Winter Weather Advisory | LOT | Boone, Cook, DeKalb, DuPage, Grundy, Kane and 8 more | 28 hr |
| Dec 27, 2:57 PM CST | Winter Weather Advisory | DVN | Bureau, Carroll, Henry, Jo Daviess, Mercer, Putnam and 3 more | 27 hr |
| Dec 31, 11:01 AM CST | Winter Weather Advisory | DVN | Carroll, Henry, Jo Daviess, Mercer, Rock Island, Stephenson and 1 more | 10 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Carroll County2
- Henry County2
- Jo Daviess County2
- Mercer County2
- Rock Island County2
- Stephenson County2
- Whiteside County2
- Boone County1
- Cook County1
- DeKalb County1
- DuPage County1
- Grundy County1
- Kane County1
- Kendall County1
- Lake County1
- LaSalle County1
- Lee County1
- McHenry County1
- Ogle County1
- Will County1
- Winnebago County1
- Bureau County1
- Putnam 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. Warning verification from the Mesonet's Cow. Rebuilt daily.