Alert archive / Pennsylvania / Westmoreland County

Weather alerts in Westmoreland County, Pennsylvania, 2011

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

Westmoreland County and its neighbors

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

Alerts: 248
Warnings: 67
Watches: 48
Advisories: 35
Busiest month: July49 alerts
Busiest day: March 23, 201111 alerts

Over time

By month

Warning verification

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

1 of 2 tornado warnings covering Westmoreland County in 2011 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 8 minutes after it went out.

Westmoreland County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	1	50%	1	100%	8 min
Severe thunderstorm warnings	40	32	20%	50	92%	22 min
Flash flood warnings	0			0

Each office's whole area, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Pittsburgh, PA: tornado warnings	9	1	89%	1	100%	8 min
NWS Pittsburgh, PA: severe thunderstorm warnings	231	161	30%	428	83%	22 min
NWS Pittsburgh, PA: flash flood warnings	21	11	48%	23	91%	81 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 6, 10:40 PM EST	Special Weather Statement	PBZ	110 min
Jan 7, 7:09 AM EST	Special Weather Statement	PBZ	51 min
Jan 7, 8:54 PM EST	Winter Weather Advisory	PBZ	39 hr
Jan 9, 2:36 PM EST	Winter Storm Watch	PBZ	25 hr
Jan 10, 3:19 PM EST	Winter Weather Advisory	PBZ	3 days
Jan 17, 2:20 PM EST	Winter Weather Advisory	PBZ	20 hr
Jan 19, 2:40 PM EST	Winter Weather Advisory	PBZ	37 hr
Jan 21, 3:23 AM EST	Winter Weather Advisory	PBZ	15 hr
Jan 25, 8:58 PM EST	Winter Storm Warning	PBZ	24 hr
Jan 25, 8:58 PM EST	Winter Weather Advisory	PBZ	24 hr
Jan 26, 7:30 AM EST	Mesoscale Discussion	SPC	5 hr
Jan 27, 7:03 AM EST	Special Weather Statement	PBZ	57 min
Jan 30, 3:30 PM EST	Winter Storm Watch	PBZ	19 hr
Jan 31, 10:55 AM EST	Winter Storm Warning	PBZ	41 hr
Feb 1, 12:12 AM EST	Mesoscale Discussion	SPC	5 hr
Feb 1, 3:07 PM EST	Wind Advisory	PBZ	24 hr
Feb 2, 8:45 AM EST	Special Weather Statement	PBZ	60 min
Feb 2, 2:40 PM EST	Wind Advisory	PBZ	5 hr
Feb 4, 3:46 PM EST	Winter Weather Advisory	PBZ	30 hr
Feb 7, 3:45 PM EST	Winter Weather Advisory	PBZ	20 hr
Feb 8, 3:33 PM EST	Wind Chill Advisory	PBZ	18 hr
Feb 9, 3:32 PM EST	Wind Chill Advisory	PBZ	18 hr
Feb 13, 2:39 PM EST	Wind Advisory	PBZ	28 hr
Feb 18, 2:54 PM EST	Wind Advisory	PBZ	24 hr
Feb 21, 3:54 AM EST	Winter Storm Watch	PBZ	8 hr
Feb 21, 12:08 PM EST	Winter Storm Warning	PBZ	18 hr
Feb 21, 12:08 PM EST	Winter Weather Advisory	PBZ	16 hr
Feb 21, 5:58 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 23, 10:29 AM EST	Flood Watch	PBZ	50 hr
Feb 23, 11:20 AM EST	River Flood Watch	PBZ	47 hr
Feb 23, 11:20 AM EST	River Flood Watch	PBZ	47 hr
Feb 24, 10:56 AM EST	River Flood Watch	PBZ	11 hr
Feb 27, 2:59 AM EST	Flood Watch	PBZ	36 hr
Feb 27, 9:34 PM EST	Severe Thunderstorm Warning	PBZ	41 min
Feb 27, 10:03 PM EST	Special Weather Statement	PBZ	57 min
Feb 28, 5:47 AM EST	Tornado Watch	SPC	5 hr
Feb 28, 6:01 AM EST	Severe Thunderstorm Warning	PBZ	29 min
Feb 28, 6:32 AM EST	Special Weather Statement	PBZ	28 min
Feb 28, 6:46 AM EST	Areal Flood Warning	PBZ	11 hr
Feb 28, 7:24 AM EST	Severe Thunderstorm Warning	PBZ	51 min
Feb 28, 8:14 AM EST	Areal Flood Warning	PBZ	10 hr
Feb 28, 10:34 PM EST	River Flood Warning	PBZ	11 hr
Mar 4, 3:47 AM EST	Flood Watch	PBZ	54 hr
Mar 4, 10:39 PM EST	River Flood Watch	PBZ	13 hr
Mar 4, 10:39 PM EST	River Flood Watch	PBZ	13 hr
Mar 4, 10:39 PM EST	River Flood Watch	PBZ	13 hr
Mar 6, 10:05 AM EST	River Flood Warning	PBZ	19 hr
Mar 6, 2:41 PM EST	Winter Weather Advisory	PBZ	6 hr
Mar 6, 5:37 PM EST	Special Weather Statement	PBZ	113 min
Mar 8, 2:21 PM EST	Flood Watch	PBZ	52 hr
Mar 8, 9:53 PM EST	River Flood Watch	PBZ	38 hr
Mar 8, 9:53 PM EST	River Flood Watch	PBZ	38 hr
Mar 8, 9:53 PM EST	River Flood Watch	PBZ	30 hr
Mar 8, 9:53 PM EST	River Flood Watch	PBZ	13 hr
Mar 9, 2:41 PM EST	Winter Storm Watch	PBZ	25 hr
Mar 10, 11:18 AM EST	River Flood Warning	PBZ	11 hr
Mar 10, 11:18 AM EST	River Flood Warning	PBZ	11 hr
Mar 10, 3:51 PM EST	Winter Weather Advisory	PBZ	26 hr
Mar 21, 4:03 AM EDT	Special Weather Statement	PBZ	57 min
Mar 21, 5:16 PM EDT	Special Weather Statement	PBZ	44 min
Mar 21, 6:05 PM EDT	Special Weather Statement	PBZ	55 min
Mar 21, 6:25 PM EDT	Special Weather Statement	PBZ	65 min
Mar 21, 7:28 PM EDT	Severe Thunderstorm Warning	PBZ	32 min
Mar 23, 1:13 PM EDT	Tornado Watch	SPC	7 hr
Mar 23, 3:45 PM EDT	Severe Thunderstorm Warning	PBZ	60 min
Mar 23, 3:54 PM EDT	Mesoscale Discussion	SPC	96 min
Mar 23, 4:25 PM EDT	Severe Thunderstorm Warning	PBZ	65 min
Mar 23, 4:34 PM EDT	Severe Thunderstorm Warning	PBZ	56 min
Mar 23, 4:37 PM EDT	Tornado Warning	PBZ	23 min
Mar 23, 4:54 PM EDT	Tornado Warning	PBZ	36 min
Mar 23, 4:55 PM EDT	Severe Thunderstorm Warning	PBZ	65 min
Mar 23, 5:14 PM EDT	Severe Thunderstorm Warning	PBZ	47 min
Mar 23, 5:22 PM EDT	Severe Thunderstorm Warning	PBZ	42 min
Mar 23, 5:26 PM EDT	Severe Thunderstorm Warning	PBZ	39 min
Apr 3, 6:25 PM EDT	Special Weather Statement	PBZ	35 min
Apr 3, 7:04 PM EDT	Special Weather Statement	PBZ	11 min
Apr 3, 7:51 PM EDT	Special Weather Statement	PBZ	24 min
Apr 4, 10:59 AM EDT	Special Weather Statement	PBZ	2 hr
Apr 4, 2:55 PM EDT	Special Weather Statement	PBZ	65 min
Apr 4, 3:33 PM EDT	Severe Thunderstorm Warning	PBZ	42 min
Apr 4, 4:12 PM EDT	Mesoscale Discussion	SPC	63 min
Apr 4, 4:21 PM EDT	Special Weather Statement	PBZ	39 min
Apr 4, 6:00 PM EDT	Mesoscale Discussion	SPC	90 min
Apr 11, 12:48 PM EDT	Special Weather Statement	PBZ	57 min
Apr 15, 3:30 AM EDT	Wind Advisory	PBZ	35 hr
Apr 16, 9:32 AM EDT	High Wind Warning	PBZ	4 hr
Apr 16, 4:01 PM EDT	Wind Advisory	PBZ	27 hr
Apr 20, 2:22 AM EDT	Severe Thunderstorm Watch	SPC	3 hr
Apr 20, 3:20 AM EDT	Mesoscale Discussion	SPC	85 min
Apr 20, 4:57 AM EDT	Special Weather Statement	PBZ	63 min
Apr 21, 2:55 PM EDT	Flash Flood Watch	PBZ	53 hr
Apr 25, 1:52 PM EDT	Mesoscale Discussion	SPC	83 min
Apr 25, 2:47 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 25, 6:00 PM EDT	Mesoscale Discussion	SPC	60 min
Apr 26, 1:18 PM EDT	Mesoscale Discussion	SPC	57 min
Apr 26, 1:49 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 26, 2:20 PM EDT	Special Weather Statement	PBZ	40 min
Apr 26, 3:50 PM EDT	Severe Thunderstorm Warning	PBZ	40 min
Apr 26, 4:12 PM EDT	Mesoscale Discussion	SPC	63 min
Apr 26, 4:28 PM EDT	Severe Thunderstorm Warning	PBZ	47 min
Apr 26, 4:44 PM EDT	Severe Thunderstorm Warning	PBZ	46 min
Apr 27, 10:09 AM EDT	Flash Flood Watch	PBZ	18 hr
Apr 27, 1:24 PM EDT	Mesoscale Discussion	SPC	96 min
Apr 27, 3:10 PM EDT	Tornado Watch	SPC	7 hr
Apr 27, 3:18 PM EDT	Special Weather Statement	PBZ	57 min
Apr 27, 4:06 PM EDT	Special Weather Statement	PBZ	54 min
Apr 27, 4:32 PM EDT	Severe Thunderstorm Warning	PBZ	58 min
Apr 28, 5:22 AM EDT	Wind Advisory	PBZ	6 hr
May 4, 4:04 PM EDT	Frost Advisory	PBZ	17 hr
May 12, 8:07 PM EDT	Special Weather Statement	PBZ	53 min
May 12, 8:42 PM EDT	Areal Flood Warning	PBZ	3 hr
May 12, 8:51 PM EDT	Special Weather Statement	PBZ	54 min
May 13, 3:34 PM EDT	Special Weather Statement	PBZ	56 min
May 13, 3:49 PM EDT	Areal Flood Warning	PBZ	6 hr
May 13, 3:52 PM EDT	Flood Watch	PBZ	6 hr
May 14, 4:10 AM EDT	Flash Flood Watch	PBZ	20 hr
May 15, 6:28 PM EDT	Special Weather Statement	PBZ	47 min
May 15, 7:54 PM EDT	Areal Flood Advisory	PBZ	6 hr
May 18, 2:41 AM EDT	Flood Watch	PBZ	16 hr
May 18, 7:25 AM EDT	Special Weather Statement	PBZ	50 min
May 18, 11:55 AM EDT	Mesoscale Discussion	SPC	65 min
May 18, 12:55 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
May 18, 1:51 PM EDT	Special Weather Statement	PBZ	54 min
May 18, 2:12 PM EDT	Areal Flood Warning	PBZ	4 hr
May 18, 3:08 PM EDT	Mesoscale Discussion	SPC	67 min
May 18, 6:01 PM EDT	Mesoscale Discussion	SPC	89 min
May 23, 10:33 AM EDT	Mesoscale Discussion	SPC	87 min
May 24, 12:10 AM EDT	Special Weather Statement	PBZ	35 min
May 26, 4:20 PM EDT	Severe Thunderstorm Warning	PBZ	40 min
May 26, 4:53 PM EDT	Severe Thunderstorm Warning	PBZ	52 min
May 26, 4:56 PM EDT	Severe Thunderstorm Warning	PBZ	50 min
May 26, 5:40 PM EDT	Severe Thunderstorm Warning	PBZ	33 min
May 26, 5:49 PM EDT	Mesoscale Discussion	SPC	56 min
May 26, 6:06 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
May 27, 7:30 PM EDT	Special Weather Statement	PBZ	60 min
Jun 4, 2:51 PM EDT	Special Weather Statement	PBZ	54 min
Jun 4, 6:13 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 5, 1:39 AM EDT	Special Weather Statement	PBZ	51 min
Jun 9, 10:36 AM EDT	Mesoscale Discussion	SPC	84 min
Jun 9, 11:33 AM EDT	Mesoscale Discussion	SPC	57 min
Jun 9, 12:53 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 9, 3:11 PM EDT	Special Weather Statement	PBZ	49 min
Jun 9, 3:28 PM EDT	Severe Thunderstorm Warning	PBZ	62 min
Jun 10, 2:20 PM EDT	Special Weather Statement	PBZ	55 min
Jun 10, 2:30 PM EDT	Areal Flood Advisory	PBZ	3 hr
Jun 10, 2:52 PM EDT	Special Weather Statement	PBZ	53 min
Jun 16, 5:53 PM EDT	Special Weather Statement	PBZ	52 min
Jun 16, 6:01 PM EDT	Mesoscale Discussion	SPC	89 min
Jun 19, 1:55 PM EDT	Flash Flood Watch	PBZ	15 hr
Jun 19, 11:40 PM EDT	Areal Flood Warning	PBZ	4 hr
Jun 20, 1:31 AM EDT	Special Weather Statement	PBZ	119 min
Jun 23, 12:33 PM EDT	Mesoscale Discussion	SPC	117 min
Jun 23, 4:54 PM EDT	Special Weather Statement	PBZ	66 min
Jun 23, 5:10 PM EDT	Special Weather Statement	PBZ	50 min
Jun 28, 1:19 PM EDT	Mesoscale Discussion	SPC	86 min
Jul 4, 3:44 PM EDT	Special Weather Statement	PBZ	31 min
Jul 4, 5:35 PM EDT	Areal Flood Warning	PBZ	3 hr
Jul 7, 2:14 PM EDT	Special Weather Statement	PBZ	61 min
Jul 7, 3:00 PM EDT	Special Weather Statement	PBZ	30 min
Jul 7, 4:08 PM EDT	Special Weather Statement	PBZ	22 min
Jul 7, 5:20 PM EDT	Areal Flood Warning	PBZ	2 hr
Jul 11, 2:16 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 11, 3:43 PM EDT	Mesoscale Discussion	SPC	92 min
Jul 11, 4:16 PM EDT	Severe Thunderstorm Warning	PBZ	44 min
Jul 11, 5:00 PM EDT	Severe Thunderstorm Warning	PBZ	60 min
Jul 11, 5:14 PM EDT	Severe Thunderstorm Warning	PBZ	61 min
Jul 11, 5:54 PM EDT	Mesoscale Discussion	SPC	96 min
Jul 18, 1:18 PM EDT	Mesoscale Discussion	SPC	117 min
Jul 18, 3:29 PM EDT	Severe Thunderstorm Warning	PBZ	46 min
Jul 18, 3:57 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 18, 5:22 PM EDT	Severe Thunderstorm Warning	PBZ	38 min
Jul 20, 11:32 AM EDT	Excessive Heat Warning	PBZ	30 hr
Jul 20, 11:32 AM EDT	Heat Advisory	PBZ	30 hr
Jul 21, 3:34 PM EDT	Heat Advisory	PBZ	26 hr
Jul 22, 3:17 PM EDT	Mesoscale Discussion	SPC	58 min
Jul 22, 5:19 PM EDT	Severe Thunderstorm Warning	PBZ	41 min
Jul 22, 5:19 PM EDT	Mesoscale Discussion	SPC	56 min
Jul 22, 5:37 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Jul 22, 5:48 PM EDT	Severe Thunderstorm Warning	PBZ	42 min
Jul 22, 6:15 PM EDT	Areal Flood Warning	PBZ	4 hr
Jul 22, 6:26 PM EDT	Special Weather Statement	PBZ	64 min
Jul 22, 8:13 PM EDT	Mesoscale Discussion	SPC	62 min
Jul 25, 8:58 AM EDT	Special Weather Statement	PBZ	62 min
Jul 25, 9:56 AM EDT	Special Weather Statement	PBZ	49 min
Jul 25, 10:44 AM EDT	Special Weather Statement	PBZ	61 min
Jul 25, 11:31 AM EDT	Areal Flood Advisory	PBZ	3 hr
Jul 25, 11:37 AM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 25, 6:03 PM EDT	Special Weather Statement	PBZ	27 min
Jul 25, 6:39 PM EDT	Areal Flood Warning	PBZ	3 hr
Jul 28, 4:03 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 28, 4:19 PM EDT	Special Weather Statement	PBZ	41 min
Jul 28, 4:28 PM EDT	Severe Thunderstorm Warning	PBZ	47 min
Jul 28, 5:20 PM EDT	Severe Thunderstorm Warning	PBZ	40 min
Jul 28, 6:16 PM EDT	Severe Thunderstorm Warning	PBZ	59 min
Jul 28, 7:02 PM EDT	Mesoscale Discussion	SPC	58 min
Jul 28, 7:10 PM EDT	Areal Flood Advisory	PBZ	3 hr
Jul 28, 7:12 PM EDT	Severe Thunderstorm Warning	PBZ	33 min
Jul 28, 7:15 PM EDT	Special Weather Statement	PBZ	30 min
Jul 28, 7:43 PM EDT	Severe Thunderstorm Warning	PBZ	23 min
Jul 28, 8:47 PM EDT	Special Weather Statement	PBZ	58 min
Jul 29, 2:06 PM EDT	Mesoscale Discussion	SPC	84 min
Jul 29, 4:39 PM EDT	Special Weather Statement	PBZ	51 min
Jul 29, 4:40 PM EDT	Mesoscale Discussion	SPC	95 min
Jul 29, 4:50 PM EDT	Severe Thunderstorm Warning	PBZ	40 min
Aug 1, 3:22 PM EDT	Severe Thunderstorm Warning	PBZ	38 min
Aug 1, 4:13 PM EDT	Special Weather Statement	PBZ	32 min
Aug 9, 12:38 PM EDT	Special Weather Statement	PBZ	52 min
Aug 19, 10:33 AM EDT	Severe Thunderstorm Warning	PBZ	57 min
Aug 19, 3:56 PM EDT	Severe Thunderstorm Warning	PBZ	64 min
Aug 19, 4:48 PM EDT	Severe Thunderstorm Warning	PBZ	57 min
Aug 19, 4:52 PM EDT	Flash Flood Watch	PBZ	3 hr
Aug 19, 5:04 PM EDT	Special Weather Statement	PBZ	26 min
Aug 21, 3:46 PM EDT	Special Weather Statement	PBZ	44 min
Aug 21, 4:13 PM EDT	Severe Thunderstorm Warning	PBZ	62 min
Aug 24, 11:48 PM EDT	Mesoscale Discussion	SPC	87 min
Aug 25, 12:42 AM EDT	Severe Thunderstorm Watch	SPC	5 hr
Aug 25, 2:31 AM EDT	Mesoscale Discussion	SPC	119 min
Sep 1, 2:04 PM EDT	Special Weather Statement	PBZ	56 min
Sep 3, 6:41 PM EDT	Severe Thunderstorm Warning	PBZ	19 min
Sep 4, 1:33 PM EDT	Mesoscale Discussion	SPC	87 min
Sep 5, 3:49 PM EDT	Flash Flood Watch	PBZ	36 hr
Sep 5, 10:29 PM EDT	River Flood Watch	PBZ	24 hr
Sep 5, 10:29 PM EDT	River Flood Watch	PBZ	24 hr
Sep 5, 10:29 PM EDT	River Flood Watch	PBZ	35 hr
Sep 5, 10:29 PM EDT	River Flood Watch	PBZ	24 hr
Sep 10, 5:35 PM EDT	Special Weather Statement	PBZ	55 min
Sep 23, 9:57 PM EDT	Dense Fog Advisory	PBZ	11 hr
Oct 14, 2:53 PM EDT	Wind Advisory	PBZ	28 hr
Oct 22, 4:12 AM EDT	Frost Advisory	PBZ	29 hr
Oct 22, 4:12 AM EDT	Freeze Warning	PBZ	29 hr
Oct 28, 3:57 AM EDT	Winter Storm Watch	PBZ	9 hr
Oct 28, 6:48 AM EDT	Dense Fog Advisory	PBZ	2 hr
Oct 28, 12:38 PM EDT	Winter Storm Warning	PBZ	25 hr
Oct 28, 12:38 PM EDT	Winter Weather Advisory	PBZ	25 hr
Oct 29, 11:43 PM EDT	Dense Fog Advisory	PBZ	11 hr
Nov 14, 8:41 PM EST	Mesoscale Discussion	SPC	2 hr
Nov 14, 9:48 PM EST	Special Weather Statement	PBZ	57 min
Nov 22, 11:05 AM EST	Flood Watch	PBZ	13 hr
Nov 22, 9:07 PM EST	Areal Flood Warning	PBZ	6 hr
Nov 23, 7:27 AM EST	River Flood Warning	PBZ	20 hr
Nov 23, 7:27 AM EST	River Flood Warning	PBZ	20 hr
Dec 6, 4:02 PM EST	Winter Storm Warning	PBZ	29 hr
Dec 7, 2:35 AM EST	Winter Weather Advisory	PBZ	17 hr
Dec 15, 6:19 PM EST	Special Weather Statement	PBZ	86 min
Dec 21, 3:49 PM EST	Special Weather Statement	PBZ	26 min
Dec 21, 4:18 PM EST	Special Weather Statement	PBZ	42 min
Dec 21, 5:06 PM EST	Special Weather Statement	PBZ	24 min
Dec 27, 4:21 AM EST	Winter Weather Advisory	PBZ	24 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	40
Tornado Warning	2
Severe Thunderstorm Watch	13
Tornado Watch	3
Mesoscale Discussion	35
Special Weather Statement	63
Flooding
Areal Flood Warning	11
River Flood Warning	6
Flash Flood Watch	6
Flood Watch	7
River Flood Watch	14
Areal Flood Advisory	4
Winter
Winter Storm Warning	5
Winter Storm Watch	5
Winter Weather Advisory	14
Heat
Excessive Heat Warning	1
Heat Advisory	2
Cold
Freeze Warning	1
Frost Advisory	2
Wind Chill Advisory	2
Wind and dust
High Wind Warning	1
Wind Advisory	8
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.