Dense Fog Advisories in Illinois, 2015

Dense Fog Advisories by county

Each county as a circle sized by its count in 2015. Tap one for its archive.

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
Mar 10, 1:05 AM CDT	Dense Fog Advisory	LOT	Boone, DeKalb, DuPage, Grundy, Kane, Kendall and 6 more	12 hr
Mar 10, 1:42 AM CDT	Dense Fog Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	10 hr
Mar 10, 7:05 PM CDT	Dense Fog Advisory	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	14 hr
Mar 10, 7:10 PM CDT	Dense Fog Advisory	DVN	Carroll, Jo Daviess, Stephenson, Whiteside	7 hr
Mar 10, 7:54 PM CDT	Dense Fog Advisory	ILX	Champaign, Christian, Clark, Clay, Coles, Crawford and 18 more	16 hr
Mar 10, 8:14 PM CDT	Dense Fog Advisory	PAH	Edwards, Franklin, Gallatin, Hamilton, Jackson, Jefferson and 6 more	13 hr
Mar 10, 9:40 PM CDT	Dense Fog Advisory	LSX	Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more	13 hr
Mar 11, 9:14 AM CDT	Dense Fog Advisory	PAH	Edwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more	3 hr
Mar 12, 3:58 AM CDT	Dense Fog Advisory	PAH	Franklin, Gallatin, Hamilton, Hardin, Jackson, Jefferson and 8 more	4 hr
Mar 12, 5:25 AM CDT	Dense Fog Advisory	LSX	Monroe, Randolph, Saint Clair, Washington	4 hr
Mar 13, 10:50 PM CDT	Dense Fog Advisory	ILX	Champaign, Christian, Coles, DeWitt, Douglas, Edgar and 10 more	8 hr
Mar 13, 11:01 PM CDT	Dense Fog Advisory	LOT	Ford, Iroquois, Kankakee, Livingston	7 hr
Apr 7, 6:48 AM CDT	Dense Fog Advisory	ILX	Cass, Champaign, Christian, Coles, DeWitt, Douglas and 21 more	4 hr
Apr 8, 5:34 PM CDT	Dense Fog Advisory	LOT	Lake	15 hr
Apr 17, 2:01 AM CDT	Dense Fog Advisory	LOT	Ford, Iroquois, Kankakee, Livingston	7 hr
Apr 17, 2:05 AM CDT	Dense Fog Advisory	ILX	Champaign, Clark, Clay, Coles, Crawford, Cumberland and 10 more	7 hr
May 5, 2:40 PM CDT	Dense Fog Advisory	LOT	Lake	20 hr
May 9, 6:39 AM CDT	Dense Fog Advisory	ILX	Cass, Christian, DeWitt, Logan, McLean, Macon and 7 more	2 hr
May 10, 6:48 PM CDT	Dense Fog Advisory	LOT	Lake	13 hr
Jun 21, 1:45 AM CDT	Dense Fog Advisory	DVN	Carroll, Jo Daviess, Stephenson	7 hr
Jun 29, 4:31 AM CDT	Dense Fog Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	4 hr
Aug 8, 2:34 AM CDT	Dense Fog Advisory	PAH	Edwards, Gallatin, Hamilton, Hardin, Massac, Pope and 4 more	6 hr
Aug 8, 2:54 AM CDT	Dense Fog Advisory	ILX	Clark, Clay, Crawford, Cumberland, Effingham, Jasper and 2 more	6 hr
Aug 10, 4:42 AM CDT	Dense Fog Advisory	ILX	Cass, Champaign, DeWitt, Fulton, Knox, Logan and 12 more	4 hr
Aug 10, 4:47 AM CDT	Dense Fog Advisory	LOT	Ford, Grundy, Iroquois, Kankakee, LaSalle, Lee and 1 more	5 hr
Aug 10, 5:03 AM CDT	Dense Fog Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	3 hr
Aug 23, 5:35 AM CDT	Dense Fog Advisory	PAH	Edwards, Gallatin, Hamilton, Hardin, Saline, Wabash and 2 more	2 hr
Aug 23, 7:11 AM CDT	Dense Fog Advisory	LSX	Bond, Clinton, Fayette, Marion, Montgomery, Washington	109 min
Aug 30, 12:40 AM CDT	Dense Fog Advisory	DVN	Hancock, Henderson, Henry, McDonough, Mercer, Rock Island and 1 more	10 hr
Aug 30, 7:14 PM CDT	Dense Fog Advisory	DVN	Carroll, Henderson, Henry, Jo Daviess, Mercer, Rock Island and 2 more	11 hr
Aug 31, 12:50 AM CDT	Dense Fog Advisory	LOT	Boone, DeKalb, DuPage, Grundy, Kane, Kankakee and 6 more	8 hr
Sep 10, 3:45 AM CDT	Dense Fog Advisory	ILX	Clark, Clay, Crawford, Cumberland, Effingham, Jasper and 2 more	4 hr
Oct 7, 1:48 AM CDT	Dense Fog Advisory	LOT	Ford, Iroquois, Kankakee, Livingston	7 hr
Oct 7, 2:18 AM CDT	Dense Fog Advisory	ILX	Champaign, Clark, Coles, Cumberland, DeWitt, Douglas and 6 more	7 hr
Nov 1, 3:48 AM CST	Dense Fog Advisory	LSX	Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more	4 hr
Nov 1, 5:58 AM CST	Dense Fog Advisory	ILX	Cass, Champaign, Christian, Clark, Clay, Coles and 26 more	3 hr
Nov 1, 11:06 PM CST	Dense Fog Advisory	ILX	Clay, Crawford, Effingham, Jasper, Lawrence, Richland	8 hr
Nov 1, 11:07 PM CST	Dense Fog Advisory	LSX	Bond, Clinton, Fayette, Macoupin, Madison, Marion and 5 more	11 hr
Nov 1, 11:19 PM CST	Dense Fog Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	10 hr
Nov 2, 6:58 AM CST	Dense Fog Advisory	ILX	Champaign, Christian, Clark, Clay, Coles, Crawford and 12 more	3 hr
Nov 2, 7:59 PM CST	Dense Fog Advisory	ILX	Cass, Champaign, Christian, Clark, Clay, Coles and 29 more	14 hr
Nov 2, 8:37 PM CST	Dense Fog Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	14 hr
Nov 2, 8:43 PM CST	Dense Fog Advisory	LSX	Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more	13 hr
Nov 3, 1:31 AM CST	Dense Fog Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, McDonough and 5 more	8 hr
Nov 3, 3:43 AM CST	Dense Fog Advisory	LOT	DeKalb, Ford, Grundy, Iroquois, Kane, Kankakee and 5 more	6 hr
Nov 3, 7:08 PM CST	Dense Fog Advisory	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	15 hr
Nov 3, 7:16 PM CST	Dense Fog Advisory	ILX	Cass, Champaign, Christian, Clark, Clay, Coles and 29 more	15 hr
Nov 3, 7:16 PM CST	Dense Fog Advisory	LSX	Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more	15 hr
Nov 3, 7:26 PM CST	Dense Fog Advisory	PAH	Edwards, Franklin, Gallatin, Hamilton, Jackson, Jefferson and 6 more	11 hr
Nov 3, 7:31 PM CST	Dense Fog Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	10 hr
Nov 10, 2:12 AM CST	Dense Fog Advisory	ILX	Clark, Coles, Crawford, Cumberland, Edgar, Jasper and 3 more	7 hr
Nov 10, 2:36 AM CST	Dense Fog Advisory	PAH	Alexander, Edwards, Gallatin, Hardin, Massac, Pope and 3 more	7 hr
Dec 4, 1:52 AM CST	Dense Fog Advisory	ILX	Champaign, Christian, Clark, Clay, Coles, Crawford and 14 more	11 hr
Dec 4, 1:59 AM CST	Dense Fog Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Jackson and 11 more	7 hr
Dec 4, 2:00 AM CST	Dense Fog Advisory	LSX	Bond, Clinton, Fayette, Marion, Montgomery, Randolph and 1 more	8 hr
Dec 4, 5:53 PM CST	Dense Fog Advisory	ILX	Cass, Champaign, Christian, Clark, Clay, Coles and 28 more	18 hr
Dec 4, 7:12 PM CST	Dense Fog Advisory	LSX	Bond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more	15 hr
Dec 4, 8:01 PM CST	Dense Fog Advisory	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	16 hr
Dec 4, 8:16 PM CST	Dense Fog Advisory	PAH	Edwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more	15 hr
Dec 5, 2:17 AM CST	Dense Fog Advisory	DVN	Bureau, Carroll, Henry, Putnam, Stephenson, Whiteside	7 hr
Dec 6, 9:18 PM CST	Dense Fog Advisory	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	24 hr
Dec 6, 9:24 PM CST	Dense Fog Advisory	ILX	Cass, Champaign, Christian, Clark, Coles, Cumberland and 21 more	23 hr
Dec 6, 9:33 PM CST	Dense Fog Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	17 hr
Dec 8, 3:03 AM CST	Dense Fog Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	4 hr
Dec 11, 3:03 AM CST	Dense Fog Advisory	ILX	Clark, Clay, Crawford, Cumberland, Effingham, Jasper and 2 more	8 hr
Dec 11, 3:55 AM CST	Dense Fog Advisory	LSX	Bond, Clinton, Fayette, Madison, Marion, Monroe and 3 more	7 hr
Dec 11, 7:00 AM CST	Dense Fog Advisory	PAH	Edwards, Franklin, Jackson, Jefferson, Perry, Wabash and 1 more	4 hr
Dec 11, 9:53 PM CST	Dense Fog Advisory	DVN	Bureau, Carroll, Henderson, Henry, Jo Daviess, Mercer and 5 more	14 hr
Dec 12, 4:22 AM CST	Dense Fog Advisory	LOT	Boone, DeKalb, Ford, Iroquois, Kane, Kankakee and 7 more	25 hr
Dec 12, 7:07 AM CST	Dense Fog Advisory	ILX	Champaign, DeWitt, Fulton, Knox, Logan, McLean and 8 more	4 hr
Dec 22, 7:07 PM CST	Dense Fog Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	5 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 2014 2016

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.