Alert archive / Illinois / Dense Fog Advisories

Dense Fog Advisories in Illinois, 2011

36 dense fog advisories in 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 2011. Tap one for its archive.

Dense Fog Advisories: 36
Busiest month: September10 dense fog advisories
Busiest day: September 20, 20114 dense fog advisories

Over time

By month

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
Jan 18, 3:49 AM CST	Dense Fog Advisory	PAH	Edwards, Franklin, Gallatin, Hamilton, Jefferson, Saline and 3 more	4 hr
Jan 25, 2:55 AM CST	Dense Fog Advisory	PAH	Massac, Pope	6 hr
Feb 16, 5:00 AM CST	Dense Fog Advisory	DVN	Carroll, Jo Daviess, Rock Island, Stephenson	8 hr
Feb 16, 8:25 PM CST	Dense Fog Advisory	DVN	Carroll, Jo Daviess, Stephenson, Whiteside	6 hr
Feb 16, 8:32 PM CST	Dense Fog Advisory	LOT	Boone, DeKalb, Kane, Lake, Lee, McHenry and 2 more	6 hr
Feb 23, 10:30 PM CST	Dense Fog Advisory	LSX	Adams, Brown, Pike	8 hr
Feb 26, 9:49 PM CST	Dense Fog Advisory	LSX	Adams, Brown, Pike	6 hr
Feb 27, 3:10 PM CST	Dense Fog Advisory	LSX	Adams, Brown, Pike	6 hr
Apr 7, 5:13 AM CDT	Dense Fog Advisory	LOT	Boone, DeKalb, DuPage, Grundy, Kane, Kankakee and 7 more	7 hr
May 8, 6:20 AM CDT	Dense Fog Advisory	ILX	Champaign, Christian, Clark, Clay, Coles, Crawford and 16 more	4 hr
May 19, 5:20 AM CDT	Dense Fog Advisory	LOT	Ford, Grundy, Iroquois, Kankakee, LaSalle, Livingston	5 hr
May 19, 5:24 AM CDT	Dense Fog Advisory	ILX	Champaign, Coles, DeWitt, Douglas, Edgar, McLean and 6 more	3 hr
May 19, 8:26 PM CDT	Dense Fog Advisory	LOT	Lake	14 hr
May 20, 11:54 PM CDT	Dense Fog Advisory	LOT	Lake	6 hr
May 29, 2:10 AM CDT	Dense Fog Advisory	LOT	Boone, DeKalb, DuPage, Kane, Lake, Lee and 3 more	7 hr
May 29, 5:05 AM CDT	Dense Fog Advisory	DVN	Bureau, Carroll, Henderson, Henry, Jo Daviess, Mercer and 5 more	4 hr
Jul 19, 10:53 AM CDT	Dense Fog Advisory	LOT	Lake	10 hr
Jul 25, 6:07 AM CDT	Dense Fog Advisory	PAH	Edwards, Franklin, Hamilton, Jefferson, Perry, Wabash and 2 more	2 hr
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
Nov 4, 10:14 PM CDT	Dense Fog Advisory	PAH	Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 9 more	13 hr
Nov 5, 6:12 AM CDT	Dense Fog Advisory	LSX	Calhoun, Clinton, Greene, Jersey, Macoupin, Madison and 5 more	5 hr
Nov 23, 4:53 AM CST	Dense Fog Advisory	DVN	Hancock, Henderson, McDonough, Mercer, Warren	7 hr
Nov 24, 9:38 PM CST	Dense Fog Advisory	PAH	Hardin, Massac, Pope	8 hr
Dec 14, 11:49 AM CST	Dense Fog Advisory	DVN	Jo Daviess	2 hr
Dec 20, 9:57 PM CST	Dense Fog Advisory	LOT	DeKalb, DuPage, Ford, Grundy, Iroquois, Kane and 4 more	12 hr
Dec 20, 10:01 PM CST	Dense Fog Advisory	ILX	Champaign, Christian, Clark, Clay, Coles, Crawford and 19 more	9 hr
Dec 20, 10:59 PM CST	Dense Fog Advisory	LSX	Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more	7 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

59 more counties

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record The radar archive 2010 2012

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.