Weather alerts in Illinois, December 2020

43 weather alerts in December 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.

Weather alerts by county

Each county as a circle sized by its count in December 2020. Tap one for its archive.

Alerts: 43
Warnings: 7
Watches: 5
Advisories: 27
Busiest day: December 28, 20207 alerts

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
Nov 30, 11:51 PM CST	Small Craft Advisory	LOT		33 hr
Dec 3, 2:46 PM CST	Small Craft Advisory	LOT		14 hr
Dec 4, 4:36 AM CST	Small Craft Advisory	LOT		34 hr
Dec 4, 8:21 AM CST	Dense Fog Advisory	PAH	Alexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more	86 min
Dec 10, 3:16 PM CST	Lakeshore Flood Watch	LOT	Cook, Lake	24 hr
Dec 10, 3:26 PM CST	Gale Watch	LOT		12 hr
Dec 10, 3:26 PM CST	Small Craft Advisory	LOT		69 hr
Dec 11, 2:08 AM CST	Winter Weather Advisory	DVN	Jo Daviess, Stephenson	36 hr
Dec 11, 3:35 AM CST	Lakeshore Flood Warning	LOT	Cook, Lake	41 hr
Dec 11, 3:47 AM CST	Gale Warning	LOT		35 hr
Dec 11, 2:47 PM CST	Lakeshore Flood Advisory	LOT	Cook	42 hr
Dec 11, 8:39 PM CST	Winter Weather Advisory	LOT	Boone, Winnebago	17 hr
Dec 12, 1:53 AM CST	Winter Storm Warning	DVN	Jo Daviess	12 hr
Dec 12, 3:12 PM CST	River Flood Advisory	LOT	DuPage, Will	12 hr
Dec 13, 3:02 PM CST	Small Craft Advisory	LOT		31 hr
Dec 15, 2:45 PM CST	Small Craft Advisory	LOT		31 hr
Dec 17, 9:00 PM CST	Small Craft Advisory	LOT		36 hr
Dec 20, 2:42 PM CST	Small Craft Advisory	LOT		60 hr
Dec 21, 11:32 AM CST	Wind Advisory	DVN	Jo Daviess	5 hr
Dec 22, 3:11 AM CST	Gale Watch	LOT		12 hr
Dec 22, 3:11 AM CST	Small Craft Advisory	LOT		24 hr
Dec 22, 3:38 PM CST	Gale Warning	LOT		38 hr
Dec 23, 2:32 AM CST	Wind Advisory	LOT	Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more	25 hr
Dec 23, 3:05 AM CST	Wind Advisory	ILX	Cass, Champaign, Christian, Clark, Clay, Coles and 29 more	24 hr
Dec 23, 3:15 AM CST	Wind Advisory	LSX	Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more	21 hr
Dec 23, 3:34 AM CST	Wind Advisory	PAH	Franklin, Jackson, Jefferson, Perry, Wayne	20 hr
Dec 23, 3:43 AM CST	Wind Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	23 hr
Dec 24, 2:50 AM CST	Small Craft Advisory	LOT		54 hr
Dec 27, 3:57 AM CST	Small Craft Advisory	LOT		47 hr
Dec 28, 3:19 AM CST	Winter Storm Watch	DVN	Carroll, Henry, Jo Daviess, Mercer, Rock Island, Stephenson and 1 more	17 hr
Dec 28, 3:31 AM CST	Winter Storm Watch	LOT	Boone, Ogle, Winnebago	12 hr
Dec 28, 3:02 PM CST	Winter Weather Advisory	ILX	Cass, Fulton, Knox, Marshall, Mason, Morgan and 6 more	37 hr
Dec 28, 3:04 PM CST	Winter Storm Warning	LOT	Boone, Cook, DeKalb, Kane, Lake, Lee and 3 more	42 hr
Dec 28, 3:04 PM CST	Winter Weather Advisory	LOT	Cook, DeKalb, DuPage, Grundy, Kane, Kankakee and 7 more	39 hr
Dec 28, 3:15 PM CST	Winter Storm Warning	DVN	Bureau, Carroll, Henderson, Henry, Jo Daviess, Mercer and 5 more	38 hr
Dec 28, 3:15 PM CST	Winter Weather Advisory	DVN	Bureau, Hancock, Henderson, Henry, McDonough, Mercer and 2 more	38 hr
Dec 28, 7:31 PM CST	Winter Weather Advisory	LSX	Adams, Brown, Greene, Pike	25 hr
Dec 29, 3:33 AM CST	Gale Warning	LOT		25 hr
Dec 29, 3:33 AM CST	Small Craft Advisory	LOT		47 hr
Dec 29, 2:17 PM CST	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, Henry, Jo Daviess and 7 more	4 hr
Dec 29, 3:52 PM CST	Mesoscale Discussion	SPC	Cook, DuPage, Grundy, Kane, Kankakee, Kendall and 5 more	4 hr
Dec 29, 6:05 PM CST	Special Weather Statement	DVN	Carroll, Rock Island, Whiteside	85 min
Dec 30, 1:15 AM CST	Mesoscale Discussion	SPC	Boone, Cook, DeKalb, DuPage, Kane, Kendall and 4 more	6 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

Product	Alerts
Severe storms
Mesoscale Discussion	3
Special Weather Statement	1
Flooding
River Flood Advisory	1
Winter
Winter Storm Warning	3
Winter Storm Watch	2
Winter Weather Advisory	6
Wind and dust
Wind Advisory	6
Fog and smoke
Dense Fog Advisory	1
Coast and beach
Lakeshore Flood Warning	1
Lakeshore Flood Watch	1
Lakeshore Flood Advisory	1
Marine
Gale Warning	3
Gale Watch	2
Small Craft Advisory	12

By county

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

55 more counties

Nearby

Alerts in force now Tornadoes on record The radar archive 2019 2021

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. Rebuilt daily.