Alert archive / Illinois / Dense Fog Advisories

Dense Fog Advisories in Illinois, 2022

60 dense fog advisories in 2022. 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 2022. Tap one for its archive.

Dense Fog Advisories: 60
Busiest month: December15 dense fog advisories
Busiest day: December 7, 20225 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 13, 3:47 PM CST	Dense Fog Advisory	LOT	DeKalb, Ford, Grundy, Iroquois, Kankakee, Kendall and 5 more	17 hr
Jan 13, 3:48 PM CST	Dense Fog Advisory	ILX	Cass, Champaign, Christian, Clark, Clay, Coles and 28 more	17 hr
Jan 13, 3:55 PM CST	Dense Fog Advisory	DVN	Bureau, Carroll, Henry, Putnam, Stephenson, Whiteside	11 hr
Jan 14, 5:08 AM CST	Dense Fog Advisory	PAH	Edwards, Franklin, Gallatin, Hamilton, Jefferson, Saline and 3 more	5 hr
Jan 16, 8:26 AM CST	Dense Fog Advisory	DVN	Hancock, Henderson, Mercer, Rock Island	97 min
Feb 21, 8:16 AM CST	Dense Fog Advisory	LOT	Cook, Will	4 hr
Feb 22, 12:59 AM CST	Dense Fog Advisory	LOT	Cook, DeKalb, DuPage, Grundy, Kane, Kendall and 5 more	9 hr
Apr 5, 4:10 AM CDT	Dense Fog Advisory	LOT	Cook, DuPage, Kendall, Lake, Will	11 hr
Apr 12, 1:17 AM CDT	Dense Fog Advisory	LSX	Monroe, Randolph	8 hr
Apr 12, 1:46 AM CDT	Dense Fog Advisory	PAH	Jackson	7 hr
May 19, 1:56 AM CDT	Dense Fog Advisory	LOT	Cook, DeKalb, DuPage, Ford, Grundy, Iroquois and 7 more	7 hr
May 19, 2:04 AM CDT	Dense Fog Advisory	ILX	Champaign, Coles, DeWitt, Douglas, Edgar, McLean and 6 more	6 hr
May 27, 8:22 PM CDT	Dense Fog Advisory	ILX	Cass, Champaign, Christian, Clay, Coles, Cumberland and 19 more	13 hr
May 28, 2:19 AM CDT	Dense Fog Advisory	DVN	Putnam	7 hr
Jun 6, 11:37 PM CDT	Dense Fog Advisory	PAH	Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 9 more	8 hr
Jun 7, 1:17 AM CDT	Dense Fog Advisory	LSX	Bond, Clinton, Jersey, Madison, Marion, Monroe and 3 more	7 hr
Jun 9, 2:48 AM CDT	Dense Fog Advisory	LOT	Boone, McHenry, Winnebago	5 hr
Jun 11, 3:33 AM CDT	Dense Fog Advisory	LOT	DeKalb, Grundy, Kane, Kendall, LaSalle, Lee and 2 more	4 hr
Jun 12, 3:39 AM CDT	Dense Fog Advisory	LOT	Boone, McHenry, Winnebago	5 hr
Jun 12, 3:51 AM CDT	Dense Fog Advisory	DVN	Jo Daviess, Stephenson	5 hr
Jul 2, 4:03 AM CDT	Dense Fog Advisory	LOT	Cook, Iroquois, Kankakee, Will	4 hr
Aug 5, 7:39 AM CDT	Dense Fog Advisory	ILX	Cass, Champaign, Christian, DeWitt, Fulton, Logan and 12 more	81 min
Aug 6, 6:47 AM CDT	Dense Fog Advisory	ILX	Champaign, Clark, Clay, Coles, Crawford, Cumberland and 10 more	2 hr
Aug 16, 11:38 PM CDT	Dense Fog Advisory	PAH	Alexander, Franklin, Jackson, Johnson, Massac, Perry and 5 more	8 hr
Aug 18, 5:52 AM CDT	Dense Fog Advisory	LOT	Cook, Kankakee, Will	3 hr
Aug 21, 1:18 AM CDT	Dense Fog Advisory	ILX	Cass, Champaign, DeWitt, Fulton, Knox, Logan and 12 more	9 hr
Aug 21, 1:19 AM CDT	Dense Fog Advisory	LOT	DeKalb, Ford, Grundy, Iroquois, Kane, Kankakee and 5 more	8 hr
Aug 21, 1:27 AM CDT	Dense Fog Advisory	DVN	Bureau, Carroll, Henry, Jo Daviess, McDonough, Mercer and 5 more	7 hr
Sep 3, 3:28 AM CDT	Dense Fog Advisory	LSX	Adams, Brown, Pike	5 hr
Sep 6, 2:27 AM CDT	Dense Fog Advisory	ILX	Knox	5 hr
Sep 6, 2:31 AM CDT	Dense Fog Advisory	DVN	Hancock, Henderson, Henry, McDonough, Mercer, Rock Island and 1 more	6 hr
Sep 7, 4:27 AM CDT	Dense Fog Advisory	LOT	Boone, DeKalb, Kane, McHenry	5 hr
Sep 15, 2:36 AM CDT	Dense Fog Advisory	LOT	Cook, DeKalb, DuPage, Ford, Grundy, Iroquois and 8 more	6 hr
Sep 15, 3:44 AM CDT	Dense Fog Advisory	DVN	Bureau, Carroll, Jo Daviess, Putnam, Stephenson, Whiteside	5 hr
Sep 24, 3:02 AM CDT	Dense Fog Advisory	DVN	Hancock, Henderson, McDonough, Warren	7 hr
Oct 30, 7:26 PM CDT	Dense Fog Advisory	ILX	Cass, Champaign, Christian, Coles, DeWitt, Douglas and 18 more	15 hr
Oct 31, 3:07 AM CDT	Dense Fog Advisory	LOT	Cook, Ford, Grundy, Iroquois, Kankakee, Livingston and 1 more	9 hr
Oct 31, 8:16 PM CDT	Dense Fog Advisory	ILX	Champaign, Christian, Clark, Clay, Coles, Crawford and 16 more	15 hr
Oct 31, 8:28 PM CDT	Dense Fog Advisory	LSX	Bond, Clinton, Fayette, Macoupin, Madison, Marion and 5 more	13 hr
Oct 31, 9:01 PM CDT	Dense Fog Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	13 hr
Oct 31, 9:17 PM CDT	Dense Fog Advisory	LOT	Cook, DuPage, Ford, Iroquois, Kankakee, Livingston and 1 more	13 hr
Nov 25, 6:33 PM CST	Dense Fog Advisory	LSX	Bond, Clinton, Fayette, Madison, Marion, Monroe and 3 more	14 hr
Nov 25, 6:36 PM CST	Dense Fog Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	13 hr
Nov 25, 6:38 PM CST	Dense Fog Advisory	ILX	Clark, Clay, Crawford, Cumberland, Effingham, Jasper and 2 more	14 hr
Nov 28, 3:47 AM CST	Dense Fog Advisory	LOT	Boone, DeKalb, Lee, McHenry, Ogle, Winnebago	4 hr
Dec 5, 10:55 PM CST	Dense Fog Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	10 hr
Dec 6, 12:36 AM CST	Dense Fog Advisory	ILX	Champaign, Christian, Clark, Clay, Coles, Crawford and 14 more	9 hr
Dec 6, 3:15 AM CST	Dense Fog Advisory	LSX	Bond, Clinton, Fayette, Jersey, Macoupin, Madison and 6 more	7 hr
Dec 6, 9:33 PM CST	Dense Fog Advisory	LSX	Randolph	12 hr
Dec 6, 10:34 PM CST	Dense Fog Advisory	PAH	Alexander, Franklin, Jackson, Jefferson, Johnson, Massac and 4 more	10 hr
Dec 7, 1:02 AM CST	Dense Fog Advisory	LOT	Boone, Cook, DeKalb, DuPage, Kane, Kendall and 6 more	9 hr
Dec 7, 3:36 AM CST	Dense Fog Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	8 hr
Dec 7, 3:42 AM CST	Dense Fog Advisory	ILX	Christian, Coles, DeWitt, Douglas, Fulton, Knox and 11 more	8 hr
Dec 7, 10:06 PM CST	Dense Fog Advisory	DVN	Hancock, Henderson, McDonough, Warren	8 hr
Dec 7, 10:31 PM CST	Dense Fog Advisory	ILX	Cass, Christian, DeWitt, Fulton, Knox, Logan and 13 more	8 hr
Dec 9, 1:30 AM CST	Dense Fog Advisory	PAH	Alexander, Franklin, Jackson, Johnson, Massac, Perry and 4 more	8 hr
Dec 9, 8:08 PM CST	Dense Fog Advisory	PAH	Alexander, Hardin, Massac, Pope, Pulaski	9 hr
Dec 9, 8:46 PM CST	Dense Fog Advisory	ILX	Champaign, DeWitt, Douglas, Edgar, Fulton, Knox and 11 more	15 hr
Dec 9, 9:31 PM CST	Dense Fog Advisory	DVN	Bureau, Henderson, Henry, Mercer, Putnam, Rock Island and 1 more	14 hr
Dec 10, 8:40 PM CST	Dense Fog Advisory	LOT	Cook, Ford, Iroquois, Kankakee, Will	6 hr

By county

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

60 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 2021 2023

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.