Alert archive / Illinois / Dense Fog Advisories / 2021
Dense Fog Advisories in Illinois, March 2021
4 dense fog advisories in March 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 March 2021. Tap one for its archive.
- Dense Fog Advisories
- 4
- Busiest day
- March 16, 20214 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 |
|---|---|---|---|---|
| Mar 16, 12:22 AM CDT | Dense Fog Advisory | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 10 hr |
| Mar 16, 12:37 AM CDT | Dense Fog Advisory | DVN | Hancock, Henderson, McDonough, Mercer, Warren | 9 hr |
| Mar 16, 12:58 AM CDT | Dense Fog Advisory | LSX | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 9 hr |
| Mar 16, 1:22 AM CDT | Dense Fog Advisory | PAH | Edwards, Franklin, Gallatin, Hamilton, Jackson, Jefferson and 6 more | 9 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Cass County1
- Champaign County1
- Christian County1
- Clark County1
- Clay County1
- Coles County1
- Crawford County1
- Cumberland County1
- DeWitt County1
- Douglas County1
- Edgar County1
- Effingham County1
- Fulton County1
- Jasper County1
- Knox County1
- Lawrence County1
- Logan County1
- McLean County1
- Macon County1
- Marshall County1
- Mason County1
- Menard County1
- Morgan County1
- Moultrie County1
- Peoria County1
- Piatt County1
- Richland County1
- Sangamon County1
- Schuyler County1
- Scott County1
- Shelby County1
- Stark County1
- Tazewell County1
- Vermilion County1
- Woodford County1
- Hancock County1
- Henderson County1
- McDonough County1
- Mercer County1
- Warren County1
29 more counties
- Adams County1
- Bond County1
- Brown County1
- Calhoun County1
- Clinton County1
- Fayette County1
- Greene County1
- Jersey County1
- Macoupin County1
- Madison County1
- Marion County1
- Monroe County1
- Montgomery County1
- Pike County1
- Randolph County1
- Saint Clair County1
- Washington County1
- Edwards County1
- Franklin County1
- Gallatin County1
- Hamilton County1
- Jackson County1
- Jefferson County1
- Perry County1
- Saline County1
- Wabash County1
- Wayne County1
- White County1
- Williamson 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.