Alert archive / Illinois / Dense Fog Advisories / 2021
Dense Fog Advisories in Illinois, February 2021
8 dense fog advisories in February 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 dense fog advisories reaches back to 2005.
Dense Fog Advisories by county
Each county as a circle sized by its count in February 2021. Tap one for its archive.
- Dense Fog Advisories
- 8
- Busiest day
- February 28, 20213 dense fog 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 |
|---|---|---|---|---|
| Feb 2, 2:51 PM CST | Dense Fog Advisory | LSX | Adams, Brown, Pike | 20 hr |
| Feb 3, 1:04 AM CST | Dense Fog Advisory | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 5 more | 10 hr |
| Feb 3, 5:47 AM CST | Dense Fog Advisory | LOT | Boone, DeKalb, Grundy, Kankakee, LaSalle, Lee and 4 more | 5 hr |
| Feb 26, 1:19 AM CST | Dense Fog Advisory | DVN | Jo Daviess | 4 hr |
| Feb 27, 5:30 AM CST | Dense Fog Advisory | LOT | Cook, DeKalb, DuPage, Ford, Grundy, Iroquois and 6 more | 6 hr |
| Feb 28, 6:13 AM CST | Dense Fog Advisory | DVN | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 6 hr |
| Feb 28, 6:29 AM CST | Dense Fog Advisory | LOT | Boone, Cook, DeKalb, DuPage, Grundy, Kane and 9 more | 6 hr |
| Feb 28, 6:57 AM CST | Dense Fog Advisory | ILX | Fulton, Knox, Marshall, Peoria, Schuyler, Stark | 3 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Jo Daviess County3
- DeKalb County3
- Grundy County3
- Kankakee County3
- LaSalle County3
- Will County3
- Bureau County2
- Carroll County2
- Hancock County2
- Henderson County2
- Henry County2
- Mercer County2
- Putnam County2
- Rock Island County2
- Stephenson County2
- Whiteside County2
- Boone County2
- Lee County2
- Livingston County2
- Ogle County2
- Winnebago County2
- Cook County2
- DuPage County2
- Kane County2
- Kendall County2
- Adams County1
- Brown County1
- Pike County1
- Ford County1
- Iroquois County1
- McDonough County1
- Warren County1
- Lake County1
- McHenry County1
- Fulton County1
- Knox County1
- Marshall County1
- Peoria County1
- Schuyler County1
- Stark 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.