Weather alerts in Cook County, Illinois, 2020

200 weather alerts in 2020, 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 2020. Tap one for its archive.

Alerts: 200
Warnings: 59
Watches: 15
Advisories: 73
Busiest month: May43 alerts
Busiest day: May 15, 202010 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 11, 7:37 AM CST	River Flood Warning	LOT	26 hr
Jan 11, 8:37 AM CST	River Flood Advisory	LOT	22 hr
Jan 11, 3:10 PM CST	Mesoscale Discussion	SPC	4 hr
Feb 13, 4:06 AM CST	Special Weather Statement	LOT	54 min
Mar 5, 4:13 AM CST	Lakeshore Flood Warning	LOT	41 hr
Mar 5, 4:13 AM CST	Lakeshore Flood Advisory	LOT	41 hr
Mar 5, 2:10 PM CST	Wind Advisory	LOT	22 hr
Mar 9, 2:50 AM CDT	Lakeshore Flood Advisory	LOT	40 hr
Mar 19, 6:41 AM CDT	Dense Fog Advisory	LOT	3 hr
Mar 19, 3:59 PM CDT	Lakeshore Flood Advisory	LOT	39 hr
Mar 25, 4:39 AM CDT	Dense Fog Advisory	LOT	6 hr
Mar 28, 9:10 AM CDT	River Flood Advisory	LOT	70 hr
Mar 28, 2:43 PM CDT	Wind Advisory	LOT	29 hr
Mar 28, 11:41 PM CDT	Special Weather Statement	LOT	19 min
Mar 29, 4:58 AM CDT	River Flood Warning	LOT	30 hr
Apr 1, 10:43 PM CDT	Dense Fog Advisory	LOT	10 hr
Apr 6, 11:03 PM CDT	Mesoscale Discussion	SPC	2 hr
Apr 7, 3:06 PM CDT	Mesoscale Discussion	SPC	114 min
Apr 7, 5:26 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 7, 5:59 PM CDT	Mesoscale Discussion	SPC	91 min
Apr 7, 7:22 PM CDT	Mesoscale Discussion	SPC	83 min
Apr 7, 8:17 PM CDT	Severe Thunderstorm Warning	LOT	28 min
Apr 7, 8:17 PM CDT	Severe Thunderstorm Warning	LOT	45 min
Apr 7, 8:40 PM CDT	Severe Thunderstorm Warning	LOT	50 min
Apr 7, 9:13 PM CDT	Areal Flood Advisory	LOT	3 hr
Apr 8, 4:37 PM CDT	Severe Thunderstorm Warning	LOT	23 min
Apr 8, 4:59 PM CDT	Special Weather Statement	LOT	16 min
Apr 9, 3:18 AM CDT	Wind Advisory	LOT	16 hr
Apr 12, 3:57 AM CDT	Wind Advisory	LOT	36 hr
Apr 15, 5:22 AM CDT	Winter Weather Advisory	LOT	5 hr
Apr 16, 3:28 AM CDT	Winter Weather Advisory	LOT	32 hr
Apr 20, 8:12 PM CDT	Special Weather Statement	LOT	63 min
Apr 28, 4:51 PM CDT	Mesoscale Discussion	SPC	114 min
Apr 29, 3:19 AM CDT	Lakeshore Flood Warning	LOT	46 hr
Apr 29, 3:19 AM CDT	Lakeshore Flood Advisory	LOT	12 hr
Apr 29, 3:55 AM CDT	Flood Watch	LOT	26 hr
Apr 29, 9:54 AM CDT	River Flood Warning	LOT	7 days
Apr 29, 10:47 AM CDT	River Flood Advisory	LOT	6 days
Apr 29, 10:47 AM CDT	River Flood Advisory	LOT	12 hr
Apr 29, 8:22 PM CDT	Wind Advisory	LOT	19 hr
Apr 29, 8:48 PM CDT	Areal Flood Advisory	LOT	7 hr
Apr 29, 8:52 PM CDT	River Flood Warning	LOT	30 hr
Apr 29, 10:39 PM CDT	River Flood Warning	LOT	38 hr
Apr 29, 10:53 PM CDT	River Flood Advisory	LOT	15 hr
Apr 30, 3:48 AM CDT	Areal Flood Advisory	LOT	6 hr
May 7, 3:33 AM CDT	Freeze Watch	LOT	24 hr
May 7, 3:26 PM CDT	Lakeshore Flood Advisory	LOT	28 hr
May 8, 3:56 AM CDT	Freeze Warning	LOT	27 hr
May 8, 4:00 AM CDT	Lakeshore Flood Warning	LOT	18 hr
May 11, 2:45 PM CDT	Frost Advisory	LOT	17 hr
May 14, 10:12 AM CDT	River Flood Advisory	LOT	51 hr
May 14, 12:06 PM CDT	Flash Flood Watch	LOT	17 hr
May 14, 3:11 PM CDT	River Flood Advisory	LOT	52 hr
May 14, 6:15 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
May 14, 10:47 PM CDT	Areal Flood Advisory	LOT	4 hr
May 14, 11:09 PM CDT	Flash Flood Warning	LOT	5 hr
May 15, 12:11 AM CDT	Flash Flood Warning	LOT	4 hr
May 15, 12:57 AM CDT	Special Weather Statement	LOT	48 min
May 15, 4:05 AM CDT	Areal Flood Warning	LOT	6 hr
May 15, 4:43 AM CDT	River Flood Warning	LOT	11 days
May 15, 4:43 AM CDT	River Flood Warning	LOT	64 hr
May 15, 4:48 AM CDT	River Flood Advisory	LOT	49 hr
May 15, 10:41 AM CDT	Areal Flood Advisory	LOT	6 hr
May 15, 11:07 AM CDT	River Flood Advisory	LOT	20 hr
May 16, 2:47 PM CDT	Flash Flood Watch	LOT	32 hr
May 16, 3:06 PM CDT	Lakeshore Flood Advisory	LOT	4 days
May 16, 7:48 PM CDT	River Flood Advisory	LOT	68 hr
May 16, 8:20 PM CDT	River Flood Warning	LOT	6 days
May 17, 5:43 AM CDT	River Flood Warning	LOT	4 days
May 17, 2:14 PM CDT	Areal Flood Advisory	LOT	3 hr
May 17, 3:29 PM CDT	Areal Flood Advisory	LOT	94 min
May 17, 4:32 PM CDT	Flash Flood Warning	LOT	6 hr
May 17, 6:48 PM CDT	Flash Flood Warning Considerable damage threat	LOT	3 hr
May 17, 9:25 PM CDT	River Flood Warning	LOT	31 hr
May 17, 9:50 PM CDT	River Flood Advisory	LOT	15 hr
May 17, 10:10 PM CDT	Areal Flood Warning	LOT	30 hr
May 18, 10:39 PM CDT	River Flood Advisory	LOT	6 hr
May 23, 11:58 AM CDT	River Flood Advisory	LOT	70 hr
May 23, 12:33 PM CDT	Tornado Watch	SPC	8 hr
May 23, 2:51 PM CDT	Mesoscale Discussion	SPC	84 min
May 23, 3:02 PM CDT	Tornado Warning	LOT	43 min
May 23, 3:55 PM CDT	Severe Thunderstorm Warning	LOT	50 min
May 23, 4:37 PM CDT	Areal Flood Advisory	LOT	3 hr
May 23, 4:53 PM CDT	Flash Flood Warning	LOT	6 hr
May 23, 6:57 PM CDT	Severe Thunderstorm Warning	LOT	79 min
May 23, 7:37 PM CDT	Areal Flood Advisory	LOT	3 hr
May 23, 11:57 PM CDT	River Flood Advisory	LOT	7 hr
May 24, 12:38 AM CDT	River Flood Advisory	LOT	16 hr
Jun 5, 12:26 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 8, 3:36 PM CDT	Beach Hazards Statement	LOT	33 hr
Jun 9, 2:33 AM CDT	Wind Advisory	LOT	21 hr
Jun 9, 3:01 PM CDT	Severe Thunderstorm Warning	LOT	29 min
Jun 9, 3:20 PM CDT	Severe Thunderstorm Warning	LOT	25 min
Jun 9, 6:20 PM CDT	Mesoscale Discussion	SPC	115 min
Jun 9, 7:25 PM CDT	Severe Thunderstorm Warning	LOT	50 min
Jun 9, 7:47 PM CDT	Tornado Warning	LOT	18 min
Jun 10, 8:14 AM CDT	Severe Thunderstorm Warning	LOT	76 min
Jun 10, 9:35 AM CDT	Areal Flood Advisory	LOT	115 min
Jun 11, 3:08 PM CDT	Beach Hazards Statement	LOT	66 hr
Jun 20, 5:00 PM CDT	Special Weather Statement	LOT	30 min
Jun 20, 8:20 PM CDT	Severe Thunderstorm Warning	LOT	25 min
Jun 21, 2:40 PM CDT	Areal Flood Advisory	LOT	2 hr
Jun 22, 12:48 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 22, 1:12 PM CDT	Severe Thunderstorm Warning	LOT	63 min
Jun 22, 1:36 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 22, 4:16 PM CDT	Special Weather Statement	LOT	29 min
Jun 22, 4:19 PM CDT	Severe Thunderstorm Warning	LOT	41 min
Jun 22, 4:51 PM CDT	Flash Flood Warning	LOT	105 min
Jun 22, 4:51 PM CDT	Severe Thunderstorm Warning	LOT	39 min
Jun 22, 5:24 PM CDT	Severe Thunderstorm Warning	LOT	33 min
Jun 22, 7:49 PM CDT	Areal Flood Advisory	LOT	3 hr
Jun 26, 1:38 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 26, 6:06 PM CDT	Mesoscale Discussion	SPC	84 min
Jun 26, 6:34 PM CDT	Severe Thunderstorm Warning	LOT	56 min
Jun 26, 6:41 PM CDT	Areal Flood Advisory	LOT	3 hr
Jun 26, 7:12 PM CDT	Flash Flood Warning	LOT	3 hr
Jun 26, 7:49 PM CDT	Special Weather Statement	LOT	26 min
Jun 26, 7:52 PM CDT	Areal Flood Advisory	LOT	3 hr
Jun 26, 8:22 PM CDT	Severe Thunderstorm Warning	LOT	53 min
Jun 29, 3:20 PM CDT	Severe Thunderstorm Warning	LOT	25 min
Jun 29, 3:33 PM CDT	Areal Flood Advisory	LOT	3 hr
Jun 29, 4:11 PM CDT	Severe Thunderstorm Warning	LOT	64 min
Jun 29, 4:31 PM CDT	Areal Flood Advisory	LOT	119 min
Jun 29, 6:30 PM CDT	Areal Flood Advisory	LOT	2 hr
Jun 29, 7:03 PM CDT	Areal Flood Advisory	LOT	57 min
Jun 30, 1:10 AM CDT	Special Weather Statement	LOT	50 min
Jul 7, 6:16 PM CDT	Special Weather Statement	LOT	14 min
Jul 7, 9:29 PM CDT	Special Weather Statement	LOT	31 min
Jul 7, 10:00 PM CDT	Areal Flood Advisory	LOT	3 hr
Jul 9, 2:51 PM CDT	Mesoscale Discussion	SPC	114 min
Jul 11, 3:58 PM CDT	Beach Hazards Statement	LOT	39 hr
Jul 15, 9:42 PM CDT	Beach Hazards Statement	LOT	17 hr
Jul 17, 3:36 AM CDT	Heat Advisory	LOT	40 hr
Jul 19, 5:28 AM CDT	Special Weather Statement	LOT	62 min
Jul 19, 8:44 AM CDT	Areal Flood Advisory	LOT	6 hr
Jul 19, 8:52 AM CDT	Special Weather Statement	LOT	38 min
Jul 19, 10:12 AM CDT	Mesoscale Discussion	SPC	93 min
Jul 19, 10:32 AM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 19, 11:38 AM CDT	Severe Thunderstorm Warning	LOT	22 min
Jul 26, 8:45 PM CDT	Special Weather Statement	LOT	60 min
Jul 29, 3:33 PM CDT	Beach Hazards Statement	LOT	57 hr
Aug 2, 3:25 AM CDT	Beach Hazards Statement	LOT	3 days
Aug 2, 3:16 PM CDT	Lakeshore Flood Advisory	LOT	54 hr
Aug 2, 4:38 PM CDT	Special Weather Statement	LOT	37 min
Aug 2, 5:14 PM CDT	Areal Flood Advisory	LOT	2 hr
Aug 2, 5:14 PM CDT	Special Weather Statement	LOT	31 min
Aug 10, 10:42 AM CDT	Mesoscale Discussion	SPC	93 min
Aug 10, 11:26 AM CDT	Severe Thunderstorm Watch PDS	SPC	7 hr
Aug 10, 1:36 PM CDT	Mesoscale Discussion	SPC	114 min
Aug 10, 2:03 PM CDT	Beach Hazards Statement	LOT	23 hr
Aug 10, 2:56 PM CDT	Severe Thunderstorm Warning	LOT	49 min
Aug 10, 3:32 PM CDT	Severe Thunderstorm Warning	LOT	43 min
Aug 10, 3:36 PM CDT	Mesoscale Discussion	SPC	84 min
Aug 10, 3:43 PM CDT	Tornado Warning	LOT	26 min
Aug 10, 4:23 PM CDT	High Wind Warning	LOT	90 min
Aug 15, 4:40 PM CDT	Mesoscale Discussion	SPC	95 min
Aug 17, 3:41 AM CDT	Beach Hazards Statement	LOT	48 hr
Aug 23, 4:44 PM CDT	Severe Thunderstorm Warning	LOT	46 min
Aug 23, 5:24 PM CDT	Areal Flood Advisory	LOT	2 hr
Aug 23, 7:35 PM CDT	Severe Thunderstorm Warning	LOT	23 min
Aug 23, 7:52 PM CDT	Areal Flood Advisory	LOT	113 min
Aug 25, 3:53 AM CDT	Severe Thunderstorm Warning	LOT	54 min
Aug 25, 4:39 AM CDT	Special Weather Statement	LOT	36 min
Aug 28, 3:16 AM CDT	Beach Hazards Statement	LOT	59 hr
Aug 31, 3:01 PM CDT	Beach Hazards Statement	LOT	25 hr
Sep 5, 3:25 AM CDT	Beach Hazards Statement	LOT	19 hr
Sep 6, 3:44 PM CDT	Beach Hazards Statement	LOT	6 days
Sep 6, 9:32 PM CDT	Mesoscale Discussion	SPC	118 min
Sep 7, 3:34 PM CDT	Lakeshore Flood Advisory	LOT	48 hr
Sep 16, 3:05 AM CDT	Beach Hazards Statement	LOT	66 hr
Sep 16, 3:15 PM CDT	Lakeshore Flood Advisory	LOT	30 hr
Oct 4, 3:46 AM CDT	Frost Advisory	LOT	28 hr
Oct 12, 2:00 PM CDT	Special Weather Statement	LOT	45 min
Oct 14, 3:33 AM CDT	Wind Advisory	LOT	15 hr
Oct 14, 3:44 AM CDT	Red Flag Warning	LOT	15 hr
Oct 14, 7:41 PM CDT	Freeze Watch	LOT	7 hr
Oct 15, 2:35 AM CDT	Freeze Warning	LOT	30 hr
Oct 16, 2:40 PM CDT	Wind Advisory	LOT	28 hr
Oct 16, 2:52 PM CDT	Fire Weather Watch	LOT	12 hr
Oct 16, 2:52 PM CDT	Red Flag Warning	LOT	29 hr
Oct 22, 6:29 AM CDT	Areal Flood Advisory	LOT	3 hr
Oct 28, 3:07 PM CDT	Lakeshore Flood Advisory	LOT	43 hr
Oct 31, 10:44 AM CDT	Wind Advisory	LOT	30 hr
Nov 10, 2:58 AM CST	Wind Advisory	LOT	24 hr
Nov 10, 1:28 PM CST	Mesoscale Discussion	SPC	92 min
Nov 10, 2:05 PM CST	Tornado Watch	SPC	6 hr
Nov 10, 4:38 PM CST	Severe Thunderstorm Warning	LOT	82 min
Nov 10, 4:54 PM CST	Severe Thunderstorm Warning	LOT	81 min
Nov 10, 5:03 PM CST	Mesoscale Discussion	SPC	57 min
Nov 14, 3:04 AM CST	Wind Advisory	LOT	41 hr
Nov 18, 2:15 PM CST	Wind Advisory	LOT	26 hr
Nov 28, 9:41 PM CST	Lakeshore Flood Advisory	LOT	56 hr
Dec 10, 3:16 PM CST	Lakeshore Flood Watch	LOT	24 hr
Dec 11, 3:35 AM CST	Lakeshore Flood Warning	LOT	41 hr
Dec 11, 2:47 PM CST	Lakeshore Flood Advisory	LOT	42 hr
Dec 23, 2:32 AM CST	Wind Advisory	LOT	25 hr
Dec 28, 3:04 PM CST	Winter Storm Warning	LOT	42 hr
Dec 28, 3:04 PM CST	Winter Weather Advisory	LOT	39 hr
Dec 29, 3:52 PM CST	Mesoscale Discussion	SPC	4 hr
Dec 30, 1:15 AM CST	Mesoscale Discussion	SPC	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
Severe Thunderstorm Warning	27
Tornado Warning	3
Severe Thunderstorm Watch	6
Tornado Watch	2
Mesoscale Discussion	22
Special Weather Statement	18
Flooding
Areal Flood Warning	2
Flash Flood Warning	7
River Flood Warning	10
Flash Flood Watch	2
Flood Watch	1
Areal Flood Advisory	24
River Flood Advisory	15
Winter
Winter Storm Warning	1
Winter Weather Advisory	3
Heat
Heat Advisory	1
Cold
Freeze Warning	2
Freeze Watch	2
Frost Advisory	2
Wind and dust
High Wind Warning	1
Wind Advisory	13
Fire
Red Flag Warning	2
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	3
Coast and beach
Lakeshore Flood Warning	4
Lakeshore Flood Watch	1
Lakeshore Flood Advisory	12
Beach Hazards Statement	13

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast 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.