Alert archive / Illinois / Iroquois County

Weather alerts in Iroquois County, Illinois, 2011

196 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Iroquois County and its neighbors

Each county as a circle sized by its count in 2011. Tap one for its archive.

Alerts: 196
Warnings: 57
Watches: 32
Advisories: 47
Busiest month: May50 alerts
Busiest day: May 25, 201113 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

0 of 5 tornado warnings covering Iroquois County in 2011 had a tornado report inside them.

Iroquois County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	0	100%	0
Severe thunderstorm warnings	35	19	46%	14	71%	23 min
Flash flood warnings	3	1	67%	1	100%	58 min

Each office's whole area, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Chicago, IL: tornado warnings	25	5	80%	16	25%	12 min
NWS Chicago, IL: severe thunderstorm warnings	177	94	47%	506	76%	32 min
NWS Chicago, IL: flash flood warnings	30	8	73%	19	68%	88 min

An office's figures cover every county it serves, including across state lines.

Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.

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 10, 3:29 AM CST	Winter Weather Advisory	LOT	41 hr
Jan 19, 2:50 PM CST	Wind Chill Advisory	LOT	44 hr
Jan 24, 2:20 AM CST	Freezing Rain Advisory	LOT	9 hr
Jan 30, 5:26 AM CST	Winter Storm Watch	LOT	6 hr
Jan 30, 11:34 AM CST	Blizzard Watch	LOT	28 hr
Jan 31, 3:20 PM CST	Blizzard Warning	LOT	48 hr
Feb 1, 3:36 PM CST	Mesoscale Discussion	SPC	6 hr
Feb 2, 4:31 AM CST	Wind Chill Watch	LOT	11 hr
Feb 2, 3:26 PM CST	Wind Chill Advisory	LOT	19 hr
Feb 9, 3:09 PM CST	Wind Chill Advisory	LOT	19 hr
Feb 17, 9:35 AM CST	River Flood Advisory	LOT	43 hr
Feb 20, 4:35 AM CST	Mesoscale Discussion	SPC	6 hr
Feb 23, 3:14 PM CST	Winter Storm Watch	LOT	13 hr
Feb 24, 4:12 AM CST	Winter Storm Warning	LOT	27 hr
Feb 24, 4:12 AM CST	Winter Weather Advisory	LOT	27 hr
Feb 24, 5:20 PM CST	Mesoscale Discussion	SPC	6 hr
Feb 24, 9:41 PM CST	Mesoscale Discussion	SPC	6 hr
Feb 27, 10:04 AM CST	River Flood Warning	LOT	24 hr
Feb 27, 10:04 AM CST	River Flood Warning	LOT	24 hr
Feb 27, 1:23 PM CST	Special Weather Statement	LOT	22 min
Feb 27, 3:02 PM CST	Special Weather Statement	LOT	28 min
Feb 27, 3:37 PM CST	Winter Weather Advisory	LOT	12 hr
Feb 28, 10:16 AM CST	River Flood Advisory	LOT	17 hr
Mar 4, 3:39 PM CST	Flood Watch	LOT	12 hr
Mar 5, 5:46 AM CST	River Flood Advisory	LOT	23 hr
Mar 23, 3:20 PM CDT	Mesoscale Discussion	SPC	85 min
Apr 3, 12:21 PM CDT	Wind Advisory	LOT	6 hr
Apr 10, 10:49 PM CDT	Special Weather Statement	LOT	56 min
Apr 10, 11:03 PM CDT	Mesoscale Discussion	SPC	87 min
Apr 10, 11:42 PM CDT	Special Weather Statement	LOT	63 min
Apr 11, 12:09 AM CDT	Severe Thunderstorm Warning	LOT	36 min
Apr 11, 12:21 AM CDT	Severe Thunderstorm Warning	LOT	39 min
Apr 11, 12:45 AM CDT	Severe Thunderstorm Warning	LOT	45 min
Apr 15, 4:12 AM CDT	Wind Advisory	LOT	16 hr
Apr 19, 7:45 PM CDT	Severe Thunderstorm Warning	LOT	60 min
Apr 19, 8:15 PM CDT	Severe Thunderstorm Warning	LOT	60 min
Apr 19, 9:36 PM CDT	River Flood Advisory	LOT	48 hr
Apr 22, 1:43 PM CDT	Areal Flood Warning	LOT	8 hr
Apr 22, 7:31 PM CDT	Mesoscale Discussion	SPC	59 min
Apr 22, 9:23 PM CDT	River Flood Advisory	LOT	13 hr
Apr 22, 9:23 PM CDT	River Flood Advisory	LOT	13 hr
Apr 23, 10:24 AM CDT	River Flood Warning	LOT	11 days
Apr 23, 10:24 AM CDT	River Flood Warning	LOT	19 hr
Apr 25, 9:15 AM CDT	River Flood Warning	LOT	4 days
Apr 26, 12:26 PM CDT	Mesoscale Discussion	SPC	94 min
Apr 26, 2:02 PM CDT	Tornado Watch	SPC	7 hr
Apr 26, 3:53 PM CDT	Flood Watch	LOT	39 hr
Apr 27, 10:46 AM CDT	River Flood Advisory	LOT	3 days
Apr 27, 10:33 PM CDT	Areal Flood Warning	LOT	12 hr
May 7, 2:32 PM CDT	Mesoscale Discussion	SPC	118 min
May 7, 2:59 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 7, 3:28 PM CDT	Severe Thunderstorm Warning	LOT	32 min
May 7, 3:49 PM CDT	Severe Thunderstorm Warning	LOT	41 min
May 7, 4:06 PM CDT	Tornado Warning	LOT	39 min
May 7, 4:32 PM CDT	Severe Thunderstorm Warning	LOT	58 min
May 11, 5:56 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
May 14, 11:15 AM CDT	Areal Flood Advisory	LOT	4 hr
May 19, 5:20 AM CDT	Dense Fog Advisory	LOT	5 hr
May 22, 2:04 PM CDT	Tornado Watch	SPC	9 hr
May 22, 3:00 PM CDT	Severe Thunderstorm Warning	LOT	60 min
May 22, 3:28 PM CDT	Severe Thunderstorm Warning	LOT	77 min
May 22, 4:12 PM CDT	Severe Thunderstorm Warning	LOT	78 min
May 22, 4:16 PM CDT	Mesoscale Discussion	SPC	119 min
May 22, 4:38 PM CDT	Severe Thunderstorm Warning	LOT	67 min
May 22, 4:47 PM CDT	Flash Flood Warning	LOT	5 hr
May 22, 5:08 PM CDT	Flash Flood Warning	LOT	4 hr
May 22, 9:32 PM CDT	Areal Flood Warning	LOT	3 hr
May 22, 9:35 PM CDT	Mesoscale Discussion	SPC	55 min
May 24, 1:11 PM CDT	Mesoscale Discussion	SPC	94 min
May 25, 4:58 AM CDT	Mesoscale Discussion	SPC	92 min
May 25, 5:46 AM CDT	Tornado Watch	SPC	7 hr
May 25, 6:20 AM CDT	Special Weather Statement	LOT	40 min
May 25, 7:09 AM CDT	Special Weather Statement	LOT	36 min
May 25, 7:48 AM CDT	Mesoscale Discussion	SPC	87 min
May 25, 8:24 AM CDT	Severe Thunderstorm Warning	LOT	66 min
May 25, 8:33 AM CDT	Mesoscale Discussion	SPC	87 min
May 25, 8:59 AM CDT	Tornado Warning	LOT	21 min
May 25, 9:58 AM CDT	River Flood Watch	LOT	25 hr
May 25, 9:58 AM CDT	River Flood Watch	LOT	19 hr
May 25, 1:57 PM CDT	Flash Flood Watch	LOT	9 hr
May 25, 2:31 PM CDT	Tornado Watch	SPC	7 hr
May 25, 5:48 PM CDT	Mesoscale Discussion	SPC	117 min
May 25, 7:01 PM CDT	Severe Thunderstorm Warning	LOT	59 min
May 25, 7:06 PM CDT	Areal Flood Advisory	LOT	6 hr
May 25, 7:37 PM CDT	Severe Thunderstorm Warning	LOT	53 min
May 25, 7:50 PM CDT	Severe Thunderstorm Warning	LOT	70 min
May 26, 4:56 AM CDT	River Flood Warning	LOT	16 hr
May 26, 10:25 AM CDT	River Flood Warning	LOT	11 hr
May 27, 9:45 AM CDT	River Flood Advisory	LOT	10 hr
May 27, 9:45 AM CDT	River Flood Advisory	LOT	10 hr
May 28, 3:42 PM CDT	Mesoscale Discussion	SPC	93 min
May 29, 8:53 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
May 29, 11:51 AM CDT	Areal Flood Advisory	LOT	4 hr
May 29, 11:59 AM CDT	Mesoscale Discussion	SPC	61 min
May 29, 12:43 PM CDT	Severe Thunderstorm Warning	LOT	77 min
May 29, 4:01 PM CDT	River Flood Advisory	LOT	55 hr
May 31, 12:59 PM CDT	Mesoscale Discussion	SPC	3 hr
May 31, 2:33 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
May 31, 6:26 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 4, 1:27 PM CDT	Mesoscale Discussion	SPC	63 min
Jun 4, 2:08 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 4, 4:37 PM CDT	Severe Thunderstorm Warning	LOT	68 min
Jun 4, 5:45 PM CDT	Severe Thunderstorm Warning	LOT	75 min
Jun 4, 5:47 PM CDT	Areal Flood Advisory	LOT	6 hr
Jun 4, 7:42 PM CDT	Severe Thunderstorm Warning	LOT	48 min
Jun 4, 8:22 PM CDT	Areal Flood Advisory	LOT	6 hr
Jun 4, 8:31 PM CDT	Severe Thunderstorm Warning	LOT	44 min
Jun 9, 5:46 AM CDT	Mesoscale Discussion	SPC	59 min
Jun 9, 5:00 PM CDT	Severe Thunderstorm Warning	LOT	60 min
Jun 9, 5:09 PM CDT	Tornado Warning	LOT	39 min
Jun 10, 10:20 AM CDT	River Flood Watch	LOT	23 hr
Jun 15, 4:35 AM CDT	Areal Flood Advisory	LOT	5 hr
Jun 15, 5:39 AM CDT	Severe Thunderstorm Warning	LOT	66 min
Jun 20, 4:08 AM CDT	Mesoscale Discussion	SPC	67 min
Jun 20, 5:43 AM CDT	Severe Thunderstorm Warning	LOT	62 min
Jun 20, 6:29 AM CDT	Areal Flood Advisory	LOT	6 hr
Jun 20, 6:46 AM CDT	Severe Thunderstorm Warning	LOT	59 min
Jun 20, 1:04 PM CDT	Mesoscale Discussion	SPC	56 min
Jun 21, 11:45 AM CDT	Mesoscale Discussion	SPC	3 hr
Jun 21, 4:56 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 21, 5:42 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 21, 6:44 PM CDT	Special Weather Statement	LOT	31 min
Jun 21, 6:47 PM CDT	Special Weather Statement	LOT	28 min
Jun 21, 7:17 PM CDT	Special Weather Statement	LOT
Jun 21, 7:23 PM CDT	Special Weather Statement	LOT	67 min
Jun 27, 12:05 AM CDT	Special Weather Statement	LOT	55 min
Jun 30, 8:15 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 30, 10:15 PM CDT	Mesoscale Discussion	SPC	60 min
Jul 1, 7:02 AM CDT	Severe Thunderstorm Warning	LOT	28 min
Jul 1, 7:43 AM CDT	Severe Thunderstorm Warning	LOT	48 min
Jul 2, 1:06 PM CDT	Mesoscale Discussion	SPC	54 min
Jul 2, 2:50 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 2, 6:17 PM CDT	Mesoscale Discussion	SPC	58 min
Jul 7, 5:24 PM CDT	Special Weather Statement	LOT	36 min
Jul 10, 2:45 PM CDT	Mesoscale Discussion	SPC	2 hr
Jul 11, 4:17 AM CDT	Heat Advisory	LOT	15 hr
Jul 11, 7:10 AM CDT	Mesoscale Discussion	SPC	95 min
Jul 11, 7:50 AM CDT	Mesoscale Discussion	SPC	55 min
Jul 11, 5:16 PM CDT	Mesoscale Discussion	SPC	59 min
Jul 17, 3:40 PM CDT	Heat Advisory	LOT	60 hr
Jul 19, 2:26 AM CDT	Excessive Heat Watch	LOT	14 hr
Jul 19, 2:26 AM CDT	Excessive Heat Warning	LOT	5 days
Jul 21, 4:06 AM CDT	Excessive Heat Watch	LOT	24 hr
Jul 22, 3:50 AM CDT	Excessive Heat Watch	LOT	24 hr
Jul 23, 2:18 PM CDT	Mesoscale Discussion	SPC	87 min
Jul 23, 8:57 PM CDT	Areal Flood Advisory	LOT	4 hr
Jul 23, 9:18 PM CDT	Severe Thunderstorm Warning	LOT	57 min
Jul 24, 8:16 AM CDT	Severe Thunderstorm Warning	LOT	59 min
Jul 26, 1:11 PM CDT	Mesoscale Discussion	SPC	94 min
Jul 27, 12:12 PM CDT	Heat Advisory	LOT	7 hr
Jul 28, 4:04 AM CDT	Heat Advisory	LOT	17 hr
Jul 29, 7:48 AM CDT	Special Weather Statement	LOT	27 min
Jul 29, 8:02 AM CDT	Flash Flood Warning	LOT	5 hr
Aug 1, 3:32 AM CDT	Heat Advisory	LOT	16 hr
Aug 2, 3:38 AM CDT	Heat Advisory	LOT	20 hr
Aug 2, 5:22 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Aug 2, 10:52 PM CDT	Severe Thunderstorm Warning	LOT	68 min
Aug 2, 11:15 PM CDT	Severe Thunderstorm Warning	LOT	41 min
Aug 2, 11:25 PM CDT	Mesoscale Discussion	SPC	95 min
Aug 3, 12:08 AM CDT	Severe Thunderstorm Warning	LOT	52 min
Aug 8, 5:23 PM CDT	Mesoscale Discussion	SPC	67 min
Aug 8, 5:38 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Aug 8, 7:27 PM CDT	Mesoscale Discussion	SPC	93 min
Aug 8, 7:29 PM CDT	Tornado Warning	LOT	34 min
Aug 9, 12:17 PM CDT	Mesoscale Discussion	SPC	58 min
Aug 13, 11:45 AM CDT	Mesoscale Discussion	SPC	60 min
Aug 13, 12:12 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Aug 13, 3:29 PM CDT	Mesoscale Discussion	SPC	91 min
Aug 13, 4:19 PM CDT	Special Weather Statement	LOT	41 min
Aug 13, 4:24 PM CDT	Severe Thunderstorm Warning	LOT	66 min
Aug 20, 2:10 PM CDT	Severe Thunderstorm Warning	LOT	50 min
Aug 24, 3:46 PM CDT	Mesoscale Discussion	SPC	89 min
Aug 24, 6:08 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Sep 2, 4:02 AM CDT	Heat Advisory	LOT	15 hr
Sep 3, 12:24 PM CDT	Mesoscale Discussion	SPC	66 min
Sep 3, 3:05 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 3, 5:02 PM CDT	Mesoscale Discussion	SPC	58 min
Sep 19, 11:13 PM CDT	Dense Fog Advisory	LOT	11 hr
Sep 28, 3:37 PM CDT	Wind Advisory	LOT	45 hr
Oct 1, 3:48 PM CDT	Frost Advisory	LOT	16 hr
Oct 19, 3:56 AM CDT	Wind Advisory	LOT	24 hr
Oct 21, 2:01 PM CDT	Frost Advisory	LOT	18 hr
Oct 27, 2:48 PM CDT	Frost Advisory	LOT	16 hr
Oct 28, 3:42 PM CDT	Freeze Warning	LOT	17 hr
Oct 29, 3:19 PM CDT	Frost Advisory	LOT	17 hr
Nov 9, 12:27 PM CST	Wind Advisory	LOT	4 hr
Nov 12, 4:08 PM CST	Wind Advisory	LOT	26 hr
Nov 14, 11:24 AM CST	Mesoscale Discussion	SPC	96 min
Nov 14, 11:41 AM CST	Tornado Watch	SPC	7 hr
Nov 14, 11:52 AM CST	Special Weather Statement	LOT	23 min
Nov 14, 12:01 PM CST	Tornado Warning	LOT	44 min
Nov 18, 10:20 AM CST	Wind Advisory	LOT	7 hr
Nov 18, 11:10 AM CST	Red Flag Warning	LOT	6 hr
Nov 28, 12:23 PM CST	Flood Watch	LOT	27 hr
Dec 15, 10:54 AM CST	River Flood Advisory	LOT	23 hr
Dec 20, 9:57 PM CST	Dense Fog Advisory	LOT	12 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	34
Tornado Warning	5
Severe Thunderstorm Watch	13
Tornado Watch	5
Mesoscale Discussion	45
Special Weather Statement	15
Flooding
Areal Flood Warning	3
Flash Flood Warning	3
River Flood Warning	7
Flash Flood Watch	1
Flood Watch	3
River Flood Watch	3
Areal Flood Advisory	8
River Flood Advisory	11
Winter
Blizzard Warning	1
Winter Storm Warning	1
Blizzard Watch	1
Winter Storm Watch	2
Freezing Rain Advisory	1
Winter Weather Advisory	3
Heat
Excessive Heat Warning	1
Excessive Heat Watch	3
Heat Advisory	7
Cold
Freeze Warning	1
Wind Chill Watch	1
Frost Advisory	4
Wind Chill Advisory	3
Wind and dust
Wind Advisory	7
Fire
Red Flag Warning	1
Fog and smoke
Dense Fog Advisory	3

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2010 2012

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.