Alert archive / Illinois / Dense Fog Advisories / 2011
Dense Fog Advisories in Illinois, September 2011
10 dense fog advisories in September 2011. 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 September 2011. Tap one for its archive.
- Dense Fog Advisories
- 10
- Busiest day
- September 20, 20114 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 |
|---|---|---|---|---|
| Sep 19, 11:13 PM CDT | Dense Fog Advisory | LOT | DeKalb, DuPage, Ford, Grundy, Iroquois, Kane and 4 more | 11 hr |
| Sep 19, 11:28 PM CDT | Dense Fog Advisory | ILX | Cass, Champaign, Christian, Coles, Cumberland, DeWitt and 22 more | 11 hr |
| Sep 19, 11:52 PM CDT | Dense Fog Advisory | LSX | Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more | 9 hr |
| Sep 19, 11:57 PM CDT | Dense Fog Advisory | PAH | Alexander, Franklin, Hamilton, Jackson, Jefferson, Perry and 3 more | 6 hr |
| Sep 21, 5:06 AM CDT | Dense Fog Advisory | ILX | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 10 more | 4 hr |
| Sep 22, 11:34 PM CDT | Dense Fog Advisory | ILX | Champaign, Christian, Clark, Clay, Coles, Crawford and 16 more | 9 hr |
| Sep 22, 11:52 PM CDT | Dense Fog Advisory | LSX | Bond, Clinton, Fayette, Jersey, Macoupin, Madison and 6 more | 10 hr |
| Sep 25, 2:02 AM CDT | Dense Fog Advisory | ILX | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 10 more | 7 hr |
| Sep 25, 9:09 AM CDT | Dense Fog Advisory | ILX | Champaign, Christian, Clark, Coles, Cumberland, DeWitt and 10 more | 89 min |
| Sep 28, 2:59 AM CDT | Dense Fog Advisory | DVN | Carroll, Henry, Jo Daviess, Mercer, Rock Island, Whiteside | 8 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Champaign County5
- Coles County5
- Cumberland County5
- Douglas County5
- Edgar County5
- Effingham County5
- Moultrie County5
- Piatt County5
- Shelby County5
- Vermilion County5
- Clark County4
- Christian County3
- DeWitt County3
- Logan County3
- McLean County3
- Macon County3
- Clay County3
- Crawford County3
- Jasper County3
- Lawrence County3
- Richland County3
- Sangamon County2
- Bond County2
- Clinton County2
- Fayette County2
- Jersey County2
- Macoupin County2
- Madison County2
- Marion County2
- Monroe County2
- Montgomery County2
- Randolph County2
- Saint Clair County2
- Washington County2
- DeKalb County1
- DuPage County1
- Ford County1
- Grundy County1
- Iroquois County1
- Kane County1
33 more counties
- Kankakee County1
- Kendall County1
- LaSalle County1
- Livingston County1
- Cass County1
- Fulton County1
- Marshall County1
- Mason County1
- Menard County1
- Morgan County1
- Peoria County1
- Schuyler County1
- Scott County1
- Stark County1
- Tazewell County1
- Woodford County1
- Calhoun County1
- Greene County1
- Alexander County1
- Franklin County1
- Hamilton County1
- Jackson County1
- Jefferson County1
- Perry County1
- Union County1
- Wayne County1
- Williamson County1
- Carroll County1
- Henry County1
- Jo Daviess County1
- Mercer County1
- Rock Island County1
- Whiteside County1
Nearby
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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.