Weather alerts in Cook County, Illinois, 2021

182 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Cook County and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Alerts: 182
Warnings: 50
Watches: 20
Advisories: 62
Busiest month: June44 alerts
Busiest day: June 26, 202112 alerts

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	Lasted
Jan 3, 3:37 PM CST	Dense Fog Advisory	LOT	29 hr
Jan 15, 10:33 PM CST	Dense Fog Advisory	LOT	4 hr
Jan 24, 3:05 AM CST	Winter Storm Watch	LOT	12 hr
Jan 24, 2:55 PM CST	Winter Storm Warning	LOT	48 hr
Jan 24, 2:55 PM CST	Winter Weather Advisory	LOT	48 hr
Jan 24, 3:08 PM CST	Lakeshore Flood Advisory	LOT	45 hr
Jan 27, 2:37 AM CST	Winter Weather Advisory	LOT	11 hr
Jan 29, 3:23 AM CST	Winter Storm Watch	LOT	24 hr
Jan 29, 2:38 PM CST	Winter Storm Warning	LOT	51 hr
Jan 29, 2:43 PM CST	Lakeshore Flood Advisory	LOT	60 hr
Feb 3, 2:29 PM CST	Winter Weather Advisory	LOT	46 hr
Feb 5, 2:24 PM CST	Winter Weather Advisory	LOT	31 hr
Feb 6, 3:34 AM CST	Wind Chill Advisory	LOT	32 hr
Feb 8, 11:13 AM CST	Winter Weather Advisory	LOT	16 hr
Feb 11, 4:10 PM CST	Winter Weather Advisory	LOT	12 hr
Feb 13, 3:33 AM CST	Wind Chill Advisory	LOT	56 hr
Feb 14, 3:59 AM CST	Winter Storm Watch	LOT	10 hr
Feb 14, 2:19 PM CST	Winter Storm Warning	LOT	49 hr
Feb 15, 2:52 PM CST	Mesoscale Discussion	SPC	6 hr
Feb 27, 5:30 AM CST	Dense Fog Advisory	LOT	6 hr
Feb 28, 6:29 AM CST	Dense Fog Advisory	LOT	6 hr
Mar 10, 3:25 AM CST	Wind Advisory	LOT	23 hr
Mar 17, 3:39 AM CDT	Lakeshore Flood Advisory	LOT	46 hr
Mar 17, 2:35 PM CDT	Wind Advisory	LOT	28 hr
Mar 25, 3:29 AM CDT	Wind Advisory	LOT	23 hr
Mar 25, 3:42 AM CDT	Lakeshore Flood Advisory	LOT	33 hr
Mar 29, 2:56 AM CDT	Wind Advisory	LOT	22 hr
Apr 5, 4:25 AM CDT	Special Weather Statement	LOT	50 min
Apr 7, 3:20 PM CDT	Special Weather Statement	LOT	40 min
Apr 19, 3:45 AM CDT	Freeze Watch	LOT	11 hr
Apr 19, 2:58 PM CDT	Freeze Warning	LOT	42 hr
Apr 21, 3:22 AM CDT	Freeze Warning	LOT	29 hr
Apr 29, 6:37 PM CDT	Severe Thunderstorm Warning	LOT	38 min
Apr 29, 6:44 PM CDT	Special Weather Statement	LOT	46 min
Apr 30, 2:50 PM CDT	Wind Advisory	LOT	28 hr
May 7, 2:07 PM CDT	Frost Advisory	LOT	18 hr
May 9, 9:28 AM CDT	Areal Flood Advisory	LOT	6 hr
May 9, 10:43 AM CDT	River Flood Advisory	LOT	5 hr
May 9, 10:43 AM CDT	River Flood Advisory	LOT	21 hr
May 10, 2:23 PM CDT	Frost Advisory	LOT	18 hr
May 11, 2:11 PM CDT	Frost Advisory	LOT	17 hr
May 24, 1:43 AM CDT	Dense Fog Advisory	LOT	4 hr
May 26, 9:19 PM CDT	Beach Hazards Statement	LOT	3 days
Jun 11, 1:07 PM CDT	Special Weather Statement	LOT	113 min
Jun 12, 1:23 PM CDT	Special Weather Statement	LOT	112 min
Jun 12, 1:26 PM CDT	Mesoscale Discussion	SPC	3 hr
Jun 12, 1:52 PM CDT	Severe Thunderstorm Warning	LOT	68 min
Jun 12, 2:26 PM CDT	Severe Thunderstorm Warning	LOT	41 min
Jun 12, 2:37 PM CDT	Areal Flood Advisory	LOT	3 hr
Jun 13, 2:06 PM CDT	Beach Hazards Statement	LOT	31 hr
Jun 15, 2:54 AM CDT	Beach Hazards Statement	LOT	28 hr
Jun 18, 4:34 AM CDT	Special Weather Statement	LOT	41 min
Jun 20, 10:57 AM CDT	Mesoscale Discussion	SPC	2 hr
Jun 20, 9:40 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 20, 10:40 PM CDT	Severe Thunderstorm Warning	LOT	50 min
Jun 20, 10:46 PM CDT	Tornado Warning	LOT	20 min
Jun 20, 10:56 PM CDT	Severe Thunderstorm Warning	LOT	79 min
Jun 20, 11:05 PM CDT	Tornado Warning	LOT	40 min
Jun 20, 11:08 PM CDT	Areal Flood Advisory	LOT	4 hr
Jun 20, 11:15 PM CDT	Tornado Warning	LOT	30 min
Jun 20, 11:30 PM CDT	Severe Thunderstorm Warning	LOT	30 min
Jun 24, 2:19 PM CDT	Flash Flood Watch	LOT	54 hr
Jun 25, 8:47 AM CDT	River Flood Warning	LOT	13 hr
Jun 26, 11:49 AM CDT	Tornado Warning	LOT	26 min
Jun 26, 12:05 PM CDT	Tornado Watch	SPC	9 hr
Jun 26, 12:18 PM CDT	Flash Flood Warning	LOT	6 hr
Jun 26, 12:34 PM CDT	Severe Thunderstorm Warning	LOT	41 min
Jun 26, 12:59 PM CDT	Severe Thunderstorm Warning	LOT	11 min
Jun 26, 1:26 PM CDT	Severe Thunderstorm Warning	LOT	34 min
Jun 26, 2:08 PM CDT	Tornado Warning Tornado observed	LOT	25 min
Jun 26, 2:43 PM CDT	Areal Flood Advisory	LOT	6 hr
Jun 26, 3:50 PM CDT	Flash Flood Warning	LOT	6 hr
Jun 26, 4:26 PM CDT	River Flood Warning	LOT	28 hr
Jun 26, 4:26 PM CDT	Tornado Warning	LOT	34 min
Jun 26, 6:23 PM CDT	Areal Flood Advisory	LOT	7 hr
Jun 26, 8:31 PM CDT	River Flood Warning	LOT	22 hr
Jun 26, 9:38 PM CDT	Areal Flood Advisory	LOT	9 hr
Jun 28, 3:01 AM CDT	Flash Flood Watch	LOT	40 hr
Jun 28, 1:49 PM CDT	Areal Flood Advisory	LOT	3 hr
Jun 28, 2:43 PM CDT	Severe Thunderstorm Warning	LOT	40 min
Jun 29, 8:03 AM CDT	Areal Flood Advisory	LOT	3 hr
Jun 29, 1:34 PM CDT	River Flood Warning	LOT	5 hr
Jun 29, 1:36 PM CDT	River Flood Advisory	LOT	15 hr
Jun 29, 8:05 PM CDT	Special Weather Statement	LOT	40 min
Jun 30, 4:01 AM CDT	Beach Hazards Statement	LOT	59 hr
Jun 30, 3:54 PM CDT	Areal Flood Advisory	LOT	3 hr
Jun 30, 4:48 PM CDT	River Flood Advisory	LOT	3 hr
Jul 7, 2:02 PM CDT	Mesoscale Discussion	SPC	88 min
Jul 8, 2:58 AM CDT	Beach Hazards Statement	LOT	37 hr
Jul 10, 11:06 AM CDT	Beach Hazards Statement	LOT	40 hr
Jul 14, 2:01 PM CDT	Mesoscale Discussion	SPC	119 min
Jul 19, 3:52 PM CDT	Beach Hazards Statement	LOT	44 hr
Jul 24, 3:00 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 24, 3:32 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 24, 3:54 PM CDT	Severe Thunderstorm Warning	LOT	51 min
Jul 24, 4:26 PM CDT	Severe Thunderstorm Warning	LOT	49 min
Jul 24, 5:01 PM CDT	Severe Thunderstorm Warning	LOT	59 min
Jul 24, 5:21 PM CDT	Mesoscale Discussion	SPC	114 min
Jul 28, 4:32 AM CDT	Special Weather Statement	LOT	43 min
Jul 28, 4:50 AM CDT	Severe Thunderstorm Warning	LOT	25 min
Jul 28, 3:44 PM CDT	Beach Hazards Statement	LOT	51 hr
Jul 29, 12:32 AM CDT	Mesoscale Discussion	SPC	88 min
Jul 29, 1:00 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 29, 1:34 AM CDT	Mesoscale Discussion	SPC	86 min
Jul 29, 2:14 AM CDT	Severe Thunderstorm Warning	LOT	76 min
Jul 29, 2:58 AM CDT	Severe Thunderstorm Warning	LOT	77 min
Jul 29, 3:18 AM CDT	Mesoscale Discussion	SPC	87 min
Jul 31, 2:51 AM CDT	Beach Hazards Statement	LOT	52 hr
Aug 6, 3:23 PM CDT	Mesoscale Discussion	SPC	97 min
Aug 6, 4:06 PM CDT	Special Weather Statement	LOT	39 min
Aug 9, 12:18 PM CDT	Mesoscale Discussion	SPC	2 hr
Aug 9, 2:43 PM CDT	Tornado Watch	SPC	9 hr
Aug 9, 2:46 PM CDT	Heat Advisory	LOT	28 hr
Aug 9, 5:53 PM CDT	Mesoscale Discussion	SPC	67 min
Aug 9, 7:18 PM CDT	Severe Thunderstorm Warning	LOT	42 min
Aug 10, 3:07 PM CDT	Heat Advisory	LOT	28 hr
Aug 10, 3:47 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 10, 6:34 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	86 min
Aug 10, 6:55 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	95 min
Aug 11, 8:34 AM CDT	Mesoscale Discussion	SPC	86 min
Aug 11, 8:52 AM CDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 11, 9:40 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	65 min
Aug 11, 9:52 AM CDT	Mesoscale Discussion	SPC	83 min
Aug 11, 7:35 PM CDT	Mesoscale Discussion	SPC	85 min
Aug 11, 8:22 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 11, 9:43 PM CDT	Severe Thunderstorm Warning	LOT	26 min
Aug 11, 11:06 PM CDT	Mesoscale Discussion	SPC	84 min
Aug 12, 2:55 AM CDT	Severe Thunderstorm Warning	LOT	50 min
Aug 19, 11:27 AM CDT	Special Weather Statement	LOT	33 min
Aug 19, 1:46 PM CDT	Areal Flood Advisory	LOT	119 min
Aug 20, 5:23 AM CDT	Dense Fog Advisory	LOT	3 hr
Aug 21, 10:08 AM CDT	Beach Hazards Statement	LOT	39 hr
Aug 24, 3:19 AM CDT	Heat Advisory	LOT	17 hr
Aug 24, 3:55 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Aug 24, 6:13 PM CDT	Beach Hazards Statement	LOT	4 hr
Aug 24, 6:19 PM CDT	Areal Flood Advisory	LOT	17 min
Aug 24, 6:36 PM CDT	Flash Flood Warning	LOT	3 hr
Aug 24, 7:08 PM CDT	Severe Thunderstorm Warning	LOT	67 min
Aug 24, 8:43 PM CDT	Areal Flood Advisory	LOT	4 hr
Aug 25, 5:42 PM CDT	Severe Thunderstorm Warning	LOT	33 min
Aug 25, 6:23 PM CDT	Areal Flood Advisory	LOT	3 hr
Aug 25, 6:29 PM CDT	Severe Thunderstorm Warning	LOT	31 min
Aug 25, 7:21 PM CDT	Flash Flood Warning	LOT	3 hr
Aug 25, 8:34 PM CDT	Areal Flood Advisory	LOT	3 hr
Aug 25, 9:15 PM CDT	Flash Flood Warning	LOT	4 hr
Aug 26, 5:30 PM CDT	Special Weather Statement	LOT	30 min
Aug 29, 1:18 PM CDT	Mesoscale Discussion	SPC	87 min
Aug 29, 4:23 PM CDT	Special Weather Statement	LOT	22 min
Aug 30, 7:06 PM CDT	Beach Hazards Statement	LOT	63 hr
Sep 7, 12:25 PM CDT	Mesoscale Discussion	SPC	65 min
Sep 7, 1:12 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Sep 7, 1:41 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	49 min
Sep 7, 3:28 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	62 min
Sep 17, 2:53 PM CDT	Beach Hazards Statement	LOT	28 hr
Sep 20, 2:39 PM CDT	Beach Hazards Statement	LOT	4 days
Sep 21, 3:40 AM CDT	Lakeshore Flood Advisory	LOT	54 hr
Sep 27, 3:10 AM CDT	Beach Hazards Statement	LOT	34 hr
Oct 3, 3:26 PM CDT	Areal Flood Advisory	LOT	5 hr
Oct 8, 5:52 AM CDT	Dense Fog Advisory	LOT	3 hr
Oct 8, 9:45 PM CDT	Dense Fog Advisory	LOT	6 hr
Oct 11, 12:37 PM CDT	Mesoscale Discussion	SPC	113 min
Oct 11, 3:10 PM CDT	Tornado Watch	SPC	6 hr
Oct 11, 5:47 PM CDT	Areal Flood Advisory	LOT	3 hr
Oct 11, 6:09 PM CDT	Mesoscale Discussion	SPC	96 min
Oct 13, 12:21 AM CDT	Dense Fog Advisory	LOT	8 hr
Oct 22, 1:29 PM CDT	Frost Advisory	LOT	19 hr
Oct 23, 12:46 PM CDT	Flash Flood Watch	LOT	38 hr
Oct 23, 2:51 PM CDT	Lakeshore Flood Advisory	LOT	56 hr
Oct 23, 9:57 PM CDT	River Flood Watch	LOT	12 hr
Oct 24, 3:10 AM CDT	Wind Advisory	LOT	36 hr
Oct 24, 10:08 AM CDT	River Flood Warning	LOT	53 hr
Oct 25, 6:02 AM CDT	River Flood Warning	LOT	26 hr
Oct 28, 9:08 PM CDT	Lakeshore Flood Advisory	LOT	34 hr
Nov 12, 2:28 PM CST	Special Weather Statement	LOT	47 min
Dec 5, 1:54 PM CST	Wind Advisory	LOT	22 hr
Dec 10, 2:56 AM CST	Wind Advisory	LOT	36 hr
Dec 14, 3:19 AM CST	High Wind Watch	LOT	24 hr
Dec 14, 2:25 PM CST	Wind Advisory	LOT	30 hr
Dec 15, 3:09 AM CST	High Wind Warning	LOT	30 hr
Dec 27, 8:11 AM CST	Dense Fog Advisory	LOT	4 hr
Dec 27, 2:03 PM CST	Winter Weather Advisory	LOT	28 hr
Dec 28, 8:59 AM CST	Mesoscale Discussion	SPC	5 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
Severe Thunderstorm Warning	27
Tornado Warning	6
Severe Thunderstorm Watch	8
Tornado Watch	3
Mesoscale Discussion	22
Special Weather Statement	13
Flooding
Flash Flood Warning	5
River Flood Warning	6
Flash Flood Watch	3
River Flood Watch	1
Areal Flood Advisory	16
River Flood Advisory	4
Winter
Winter Storm Warning	3
Winter Storm Watch	3
Winter Weather Advisory	7
Heat
Heat Advisory	3
Cold
Freeze Warning	2
Freeze Watch	1
Frost Advisory	4
Wind Chill Advisory	2
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	9
Fog and smoke
Dense Fog Advisory	10
Coast and beach
Lakeshore Flood Advisory	7
Beach Hazards Statement	15

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast 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. Rebuilt daily.