Alert archive / Illinois / Grundy County

Weather alerts in Grundy County, Illinois, 2010

205 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Grundy County and its neighbors

Each county as a circle sized by its count in 2010. Tap one for its archive.

Alerts: 205
Warnings: 48
Watches: 34
Advisories: 74
Busiest month: June75 alerts
Busiest day: June 23, 201012 alerts

Over time

By month

Warning verification

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

2 of 5 tornado warnings covering Grundy County in 2010 had a tornado report inside them.

Grundy County, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	2	60%	0
Severe thunderstorm warnings	30	18	40%	11	73%	22 min
Flash flood warnings	3	3	0%	0

Each office's whole area, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Chicago, IL: tornado warnings	32	10	69%	35	63%	26 min
NWS Chicago, IL: severe thunderstorm warnings	122	70	43%	394	72%	31 min
NWS Chicago, IL: flash flood warnings	31	14	55%	51	84%	102 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 1, 3:17 PM CST	Wind Chill Advisory	LOT	19 hr
Jan 3, 2:50 AM CST	Wind Chill Advisory	LOT	7 hr
Jan 3, 10:10 AM CST	River Flood Warning	LOT	72 hr
Jan 5, 1:34 PM CST	Winter Storm Watch	LOT	23 hr
Jan 6, 9:50 AM CST	River Flood Advisory	LOT	48 hr
Jan 6, 12:51 PM CST	Winter Storm Warning	LOT	3 days
Jan 7, 3:48 PM CST	Winter Weather Advisory	LOT	17 hr
Jan 9, 2:35 PM CST	Wind Chill Advisory	LOT	18 hr
Jan 16, 8:16 PM CST	Freezing Fog Advisory	LOT	15 hr
Jan 17, 3:21 PM CST	Freezing Fog Advisory	LOT	21 hr
Jan 17, 8:22 PM CST	River Flood Advisory	LOT	38 hr
Jan 18, 8:36 PM CST	Freezing Fog Advisory	LOT	8 hr
Jan 20, 4:00 AM CST	Freezing Rain Advisory	LOT	26 hr
Jan 20, 10:34 AM CST	Mesoscale Discussion	SPC	4 hr
Jan 23, 3:26 PM CST	Dense Fog Advisory	LOT	9 hr
Jan 23, 9:33 PM CST	River Flood Advisory	LOT	38 hr
Jan 25, 3:46 PM CST	Winter Weather Advisory	LOT	17 hr
Feb 7, 1:17 PM CST	Winter Storm Watch	LOT	15 hr
Feb 8, 3:53 AM CST	Winter Storm Warning	LOT	53 hr
Feb 8, 3:53 AM CST	Winter Weather Advisory	LOT	11 hr
Feb 9, 3:17 AM CST	Blizzard Watch	LOT	12 hr
Feb 10, 4:14 AM CST	Winter Weather Advisory	LOT	10 hr
Feb 21, 12:16 PM CST	Winter Weather Advisory	LOT	20 hr
Mar 7, 9:37 PM CST	Dense Fog Advisory	LOT	12 hr
Mar 8, 6:05 PM CST	Dense Fog Advisory	LOT	18 hr
Mar 13, 10:26 AM CST	River Flood Advisory	LOT	58 hr
Mar 13, 4:58 PM CST	River Flood Advisory	LOT	35 hr
Mar 17, 2:53 AM CDT	Dense Fog Advisory	LOT	8 hr
Apr 4, 11:02 AM CDT	Mesoscale Discussion	SPC	88 min
Apr 5, 3:53 AM CDT	Dense Fog Advisory	LOT	4 hr
Apr 6, 4:44 AM CDT	Severe Thunderstorm Watch	SPC	4 hr
Apr 7, 2:47 PM CDT	Severe Thunderstorm Warning	LOT	43 min
Apr 15, 10:03 AM CDT	Red Flag Warning	LOT	10 hr
Apr 17, 2:24 AM CDT	Frost Advisory	LOT	27 hr
Apr 27, 11:16 AM CDT	Frost Advisory	LOT	21 hr
Apr 29, 3:26 AM CDT	Wind Advisory	LOT	16 hr
Apr 30, 12:41 PM CDT	Mesoscale Discussion	SPC	64 min
Apr 30, 1:05 PM CDT	Tornado Watch	SPC	9 hr
Apr 30, 7:32 PM CDT	Mesoscale Discussion	SPC	58 min
Apr 30, 7:54 PM CDT	Severe Thunderstorm Warning	LOT	35 min
May 5, 3:29 PM CDT	Red Flag Warning	LOT	6 hr
May 8, 4:10 AM CDT	Frost Advisory	LOT	28 hr
May 12, 3:13 PM CDT	Flood Watch	LOT	24 hr
May 12, 11:21 PM CDT	Severe Thunderstorm Warning	LOT	24 min
May 13, 4:33 AM CDT	Areal Flood Advisory	LOT	5 hr
May 13, 6:34 AM CDT	Mesoscale Discussion	SPC	26 min
May 13, 7:42 AM CDT	Severe Thunderstorm Warning	LOT	48 min
May 13, 10:32 PM CDT	River Flood Advisory	LOT	7 hr
May 22, 1:06 AM CDT	Dense Fog Advisory	LOT	9 hr
Jun 1, 12:32 AM CDT	Dense Fog Advisory	LOT	8 hr
Jun 1, 3:46 PM CDT	Flash Flood Watch	LOT	23 hr
Jun 2, 1:23 AM CDT	Severe Thunderstorm Warning	LOT	67 min
Jun 2, 1:31 AM CDT	Mesoscale Discussion	SPC	89 min
Jun 2, 2:07 AM CDT	Areal Flood Advisory	LOT	6 hr
Jun 2, 2:31 AM CDT	Severe Thunderstorm Warning	LOT	59 min
Jun 2, 2:48 AM CDT	Flash Flood Warning	LOT	12 hr
Jun 4, 1:43 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 4, 4:36 PM CDT	Flash Flood Watch	LOT	32 hr
Jun 4, 4:54 PM CDT	Mesoscale Discussion	SPC	66 min
Jun 4, 5:29 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 4, 9:53 PM CDT	Mesoscale Discussion	SPC	67 min
Jun 5, 9:53 AM CDT	River Flood Advisory	LOT	14 hr
Jun 5, 11:24 AM CDT	River Flood Advisory	LOT	24 hr
Jun 5, 6:29 PM CDT	Mesoscale Discussion	SPC	61 min
Jun 5, 7:37 PM CDT	Tornado Watch	SPC	6 hr
Jun 5, 8:35 PM CDT	Tornado Warning	LOT	40 min
Jun 5, 8:46 PM CDT	Tornado Warning	LOT	44 min
Jun 5, 9:05 PM CDT	Areal Flood Advisory	LOT	73 min
Jun 5, 9:14 PM CDT	Tornado Warning	LOT	46 min
Jun 5, 9:20 PM CDT	Mesoscale Discussion	SPC	115 min
Jun 5, 9:23 PM CDT	Tornado Warning	LOT	52 min
Jun 5, 9:43 PM CDT	Severe Thunderstorm Warning	LOT	32 min
Jun 5, 9:59 PM CDT	Severe Thunderstorm Warning	LOT	46 min
Jun 5, 10:29 PM CDT	Areal Flood Advisory	LOT	3 hr
Jun 5, 10:54 PM CDT	Flash Flood Warning	LOT	3 hr
Jun 11, 12:38 PM CDT	Mesoscale Discussion	SPC	2 hr
Jun 12, 12:50 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 12, 2:28 PM CDT	Severe Thunderstorm Warning	LOT	47 min
Jun 12, 3:10 PM CDT	Areal Flood Advisory	LOT	6 hr
Jun 12, 3:12 PM CDT	Severe Thunderstorm Warning	LOT	48 min
Jun 15, 8:44 PM CDT	River Flood Advisory	LOT	13 hr
Jun 18, 2:33 AM CDT	Mesoscale Discussion	SPC	27 min
Jun 18, 12:14 PM CDT	Mesoscale Discussion	SPC	61 min
Jun 18, 12:29 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 18, 2:48 PM CDT	Severe Thunderstorm Warning	LOT	42 min
Jun 18, 3:18 PM CDT	Severe Thunderstorm Warning	LOT	72 min
Jun 18, 3:52 PM CDT	Severe Thunderstorm Warning	LOT	68 min
Jun 18, 4:16 PM CDT	Areal Flood Advisory	LOT	3 hr
Jun 18, 5:06 PM CDT	Mesoscale Discussion	SPC	54 min
Jun 18, 5:47 PM CDT	Flash Flood Watch	LOT	9 hr
Jun 18, 7:38 PM CDT	Mesoscale Discussion	SPC	97 min
Jun 18, 8:05 PM CDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 18, 9:01 PM CDT	Severe Thunderstorm Warning	LOT	59 min
Jun 18, 9:53 PM CDT	Areal Flood Advisory	LOT	3 hr
Jun 18, 11:01 PM CDT	Areal Flood Advisory	LOT	2 hr
Jun 21, 6:26 AM CDT	Special Weather Statement	LOT	64 min
Jun 21, 6:48 AM CDT	Severe Thunderstorm Warning	LOT	42 min
Jun 21, 7:04 AM CDT	Severe Thunderstorm Warning	LOT	41 min
Jun 21, 4:36 PM CDT	Tornado Watch	SPC	5 hr
Jun 21, 7:00 PM CDT	Mesoscale Discussion	SPC	60 min
Jun 21, 8:51 PM CDT	Severe Thunderstorm Warning	LOT	54 min
Jun 21, 9:25 PM CDT	River Flood Advisory	LOT	4 days
Jun 21, 9:50 PM CDT	Severe Thunderstorm Warning	LOT	32 min
Jun 21, 9:51 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 21, 10:15 PM CDT	River Flood Advisory	LOT	55 hr
Jun 22, 9:01 PM CDT	Flash Flood Watch	LOT	25 hr
Jun 23, 3:38 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 23, 8:31 AM CDT	Mesoscale Discussion	SPC	59 min
Jun 23, 8:42 AM CDT	Areal Flood Advisory	LOT	5 hr
Jun 23, 1:01 PM CDT	Mesoscale Discussion	SPC	59 min
Jun 23, 2:10 PM CDT	Tornado Watch	SPC	7 hr
Jun 23, 5:29 PM CDT	Severe Thunderstorm Warning	LOT	61 min
Jun 23, 5:39 PM CDT	Severe Thunderstorm Warning	LOT	66 min
Jun 23, 5:56 PM CDT	Mesoscale Discussion	SPC	94 min
Jun 23, 6:28 PM CDT	Severe Thunderstorm Warning	LOT	62 min
Jun 23, 6:33 PM CDT	Tornado Warning	LOT	27 min
Jun 23, 6:48 PM CDT	Severe Thunderstorm Warning	LOT	42 min
Jun 23, 7:10 PM CDT	Flash Flood Warning	LOT	3 hr
Jun 23, 9:20 PM CDT	River Flood Advisory	LOT	20 hr
Jun 23, 10:13 PM CDT	River Flood Warning	LOT	24 hr
Jun 24, 10:52 PM CDT	River Flood Advisory	LOT	56 hr
Jun 26, 1:52 AM CDT	Mesoscale Discussion	SPC	83 min
Jun 26, 4:00 AM CDT	Special Weather Statement	LOT	30 min
Jun 26, 4:34 AM CDT	Areal Flood Advisory	LOT	119 min
Jul 12, 1:25 AM CDT	Dense Fog Advisory	LOT	6 hr
Jul 15, 3:30 AM CDT	Heat Advisory	LOT	16 hr
Jul 15, 11:57 AM CDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 15, 2:47 PM CDT	Mesoscale Discussion	SPC	118 min
Jul 22, 2:47 PM CDT	Heat Advisory	LOT	28 hr
Jul 23, 4:35 AM CDT	Flash Flood Watch	LOT	31 hr
Jul 23, 2:30 PM CDT	Mesoscale Discussion	SPC	90 min
Jul 23, 3:01 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 23, 4:57 PM CDT	Severe Thunderstorm Warning	LOT	48 min
Jul 23, 5:39 PM CDT	Severe Thunderstorm Warning	LOT	55 min
Jul 23, 5:51 PM CDT	Severe Thunderstorm Warning	LOT	54 min
Jul 23, 6:04 PM CDT	Areal Flood Advisory	LOT	3 hr
Jul 24, 11:09 AM CDT	River Flood Advisory	LOT	10 hr
Jul 24, 1:21 PM CDT	Mesoscale Discussion	SPC	54 min
Jul 24, 1:53 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 24, 3:37 PM CDT	Mesoscale Discussion	SPC	83 min
Jul 24, 10:03 PM CDT	Special Weather Statement	LOT	57 min
Jul 28, 1:25 PM CDT	Mesoscale Discussion	SPC	95 min
Jul 28, 2:23 PM CDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 28, 3:32 PM CDT	Special Weather Statement	LOT	43 min
Jul 28, 4:04 PM CDT	Special Weather Statement	LOT	41 min
Jul 31, 10:49 PM CDT	Dense Fog Advisory	LOT	12 hr
Aug 3, 4:39 AM CDT	Areal Flood Advisory	LOT	6 hr
Aug 3, 4:55 AM CDT	Mesoscale Discussion	SPC	95 min
Aug 3, 11:16 AM CDT	Areal Flood Warning	LOT	4 hr
Aug 3, 3:39 PM CDT	Flash Flood Watch	LOT	23 hr
Aug 4, 1:05 AM CDT	Mesoscale Discussion	SPC	85 min
Aug 4, 1:57 AM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 4, 3:42 AM CDT	Mesoscale Discussion	SPC	63 min
Aug 4, 5:37 AM CDT	Severe Thunderstorm Warning	LOT	38 min
Aug 4, 6:15 AM CDT	Areal Flood Advisory	LOT	4 hr
Aug 4, 6:19 AM CDT	Severe Thunderstorm Warning	LOT	56 min
Aug 11, 3:37 PM CDT	Heat Advisory	LOT	51 hr
Aug 13, 2:14 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 13, 7:08 PM CDT	Special Weather Statement	LOT	37 min
Aug 20, 1:58 PM CDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 20, 5:20 PM CDT	Mesoscale Discussion	SPC	85 min
Sep 5, 11:31 PM CDT	Special Weather Statement	LOT	44 min
Sep 6, 1:04 AM CDT	Special Weather Statement	LOT	86 min
Sep 21, 1:31 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 21, 2:31 PM CDT	Severe Thunderstorm Warning	LOT	44 min
Sep 21, 3:40 PM CDT	Mesoscale Discussion	SPC	95 min
Sep 21, 7:31 PM CDT	Mesoscale Discussion	SPC	59 min
Oct 3, 1:36 PM CDT	Frost Advisory	LOT	17 hr
Oct 4, 3:30 PM CDT	Frost Advisory	LOT	16 hr
Oct 12, 2:30 AM CDT	Dense Fog Advisory	LOT	7 hr
Oct 20, 1:33 PM CDT	Red Flag Warning	LOT	5 hr
Oct 21, 3:43 PM CDT	Frost Advisory	LOT	16 hr
Oct 24, 3:39 PM CDT	High Wind Watch	LOT	24 hr
Oct 24, 7:56 PM CDT	Special Weather Statement	LOT	34 min
Oct 25, 4:38 AM CDT	High Wind Warning	LOT	39 hr
Oct 25, 3:36 PM CDT	Wind Advisory	LOT	13 hr
Oct 26, 2:21 AM CDT	Mesoscale Discussion	SPC	114 min
Oct 26, 3:28 AM CDT	Tornado Watch	SPC	8 hr
Oct 26, 5:57 AM CDT	Special Weather Statement	LOT	33 min
Oct 26, 6:00 AM CDT	Mesoscale Discussion	SPC	2 hr
Oct 26, 7:13 PM CDT	Wind Advisory	LOT	24 hr
Oct 29, 9:41 PM CDT	Fire Weather Watch	LOT	12 hr
Nov 22, 7:44 AM CST	Special Weather Statement	LOT	61 min
Nov 22, 11:23 AM CST	Tornado Watch	SPC	7 hr
Nov 22, 2:10 PM CST	Mesoscale Discussion	SPC	95 min
Nov 22, 3:37 PM CST	Severe Thunderstorm Warning	LOT	38 min
Nov 22, 4:12 PM CST	Severe Thunderstorm Warning	LOT	48 min
Nov 22, 4:55 PM CST	Special Weather Statement	LOT	35 min
Nov 24, 9:51 AM CST	Winter Weather Advisory	LOT	5 hr
Nov 24, 11:35 AM CST	Mesoscale Discussion	SPC	5 hr
Nov 25, 12:07 AM CST	Dense Fog Advisory	LOT	9 hr
Dec 3, 2:28 AM CST	Winter Weather Advisory	LOT	50 hr
Dec 10, 3:58 PM CST	Winter Storm Watch	LOT	23 hr
Dec 10, 10:08 PM CST	Dense Fog Advisory	LOT	7 hr
Dec 11, 1:07 PM CST	Winter Storm Warning	LOT	26 hr
Dec 12, 2:48 PM CST	Wind Chill Advisory	LOT	20 hr
Dec 12, 2:48 PM CST	Winter Weather Advisory	LOT	9 hr
Dec 15, 4:11 AM CST	Winter Weather Advisory	LOT	28 hr
Dec 19, 3:50 PM CST	Winter Weather Advisory	LOT	42 hr
Dec 21, 2:43 PM CST	Dense Fog Advisory	LOT	8 hr
Dec 21, 10:49 PM CST	Freezing Fog Advisory	LOT	4 hr
Dec 23, 12:59 AM CST	Dense Fog Advisory	LOT	8 hr
Dec 23, 2:41 PM CST	Winter Weather Advisory	LOT	33 hr
Dec 29, 12:07 AM CST	Freezing Fog Advisory	LOT	9 hr
Dec 31, 12:48 PM CST	Special Weather Statement	LOT	42 min

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	30
Tornado Warning	5
Severe Thunderstorm Watch	15
Tornado Watch	6
Mesoscale Discussion	36
Special Weather Statement	13
Flooding
Areal Flood Warning	1
Flash Flood Warning	3
River Flood Warning	2
Flash Flood Watch	6
Flood Watch	1
Areal Flood Advisory	13
River Flood Advisory	14
Winter
Winter Storm Warning	3
Blizzard Watch	1
Winter Storm Watch	3
Freezing Rain Advisory	1
Winter Weather Advisory	11
Heat
Heat Advisory	3
Cold
Frost Advisory	6
Wind Chill Advisory	4
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	3
Fire
Red Flag Warning	3
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	14
Freezing Fog Advisory	5

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2009 2011

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.