Alert archive / Illinois / Dense Fog Advisories / 2021

Dense Fog Advisories in Illinois, January 2021

17 dense fog advisories in January 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 January 2021. Tap one for its archive.

Dense Fog Advisories: 17
Busiest day: January 2, 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
Jan 2, 2:33 PM CST	Dense Fog Advisory	LSX	Adams, Brown, Pike	21 hr
Jan 2, 2:49 PM CST	Dense Fog Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	21 hr
Jan 2, 3:04 PM CST	Dense Fog Advisory	LOT	Boone, DeKalb, Grundy, Kane, Kendall, LaSalle and 5 more	20 hr
Jan 2, 3:49 PM CST	Dense Fog Advisory	ILX	Cass, Fulton, Knox, Logan, McLean, Marshall and 10 more	18 hr
Jan 3, 1:55 PM CST	Dense Fog Advisory	LSX	Adams, Brown, Calhoun, Fayette, Greene, Jersey and 7 more	30 hr
Jan 3, 2:22 PM CST	Dense Fog Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	28 hr
Jan 3, 2:38 PM CST	Dense Fog Advisory	ILX	Cass, Champaign, Christian, Clark, Coles, Cumberland and 24 more	32 hr
Jan 3, 3:37 PM CST	Dense Fog Advisory	LOT	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 11 more	29 hr
Jan 4, 5:30 AM CST	Dense Fog Advisory	PAH	Jackson	5 hr
Jan 5, 3:18 PM CST	Dense Fog Advisory	LOT	Boone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more	19 hr
Jan 5, 3:27 PM CST	Dense Fog Advisory	ILX	Cass, Champaign, Christian, Coles, DeWitt, Douglas and 21 more	17 hr
Jan 5, 3:41 PM CST	Dense Fog Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	18 hr
Jan 5, 7:17 PM CST	Dense Fog Advisory	LSX	Adams, Brown, Fayette, Greene, Macoupin, Montgomery and 1 more	13 hr
Jan 6, 2:32 PM CST	Dense Fog Advisory	ILX	Fulton, Knox, Peoria, Stark	7 hr
Jan 6, 2:37 PM CST	Dense Fog Advisory	DVN	Carroll, Hancock, Henderson, Henry, Jo Daviess, McDonough and 5 more	13 hr
Jan 15, 10:33 PM CST	Dense Fog Advisory	LOT	Cook, Grundy, Kankakee, Kendall, Will	4 hr
Jan 25, 9:24 PM CST	Dense Fog Advisory	PAH	Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more	12 hr

By county

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

52 more counties

Nearby

Alerts in force now Tornadoes on record The radar archive 2020 2022

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.