Alert archive / Delaware / New Castle County

Weather alerts in New Castle County, Delaware, 2010

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

New Castle County and its neighbors

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

Alerts: 250
Warnings: 70
Watches: 41
Advisories: 53
Busiest month: July48 alerts
Busiest day: July 14, 20109 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 2 tornado warnings covering New Castle County in 2010 had a tornado report inside them.

New Castle County, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	0	100%	0
Severe thunderstorm warnings	25	17	32%	16	88%	28 min
Flash flood warnings	4	1	75%	3	100%	29 min

Each office's whole area, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Philadelphia/Mount Holly: tornado warnings	12	1	92%	4	25%	1 min
NWS Philadelphia/Mount Holly: severe thunderstorm warnings	183	107	42%	252	82%	29 min
NWS Philadelphia/Mount Holly: flash flood warnings	14	2	86%	15	60%	45 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 2, 10:45 AM EST	Wind Advisory	PHI	32 hr
Jan 7, 3:31 PM EST	Winter Weather Advisory	PHI	17 hr
Jan 23, 3:38 PM EST	Flood Watch	PHI	49 hr
Jan 24, 11:17 AM EST	Coastal Flood Advisory	PHI	29 hr
Jan 24, 3:13 PM EST	Wind Advisory	PHI	22 hr
Jan 25, 9:42 AM EST	Severe Thunderstorm Warning	PHI	63 min
Jan 25, 9:56 AM EST	Areal Flood Advisory	PHI	4 hr
Jan 25, 10:43 AM EST	River Flood Warning	PHI	6 hr
Jan 30, 4:16 AM EST	Winter Storm Warning	PHI	23 hr
Jan 30, 4:16 AM EST	Winter Weather Advisory	PHI	20 hr
Feb 2, 11:07 AM EST	Winter Weather Advisory	PHI	20 hr
Feb 4, 3:23 AM EST	Winter Storm Watch	PHI	10 hr
Feb 4, 1:43 PM EST	Winter Storm Warning	PHI	51 hr
Feb 5, 6:58 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 5, 11:53 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 6, 12:03 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 8, 3:45 AM EST	Winter Storm Watch	PHI	24 hr
Feb 8, 3:51 PM EST	Winter Storm Warning	PHI	54 hr
Feb 9, 7:04 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 10, 4:33 AM EST	Blizzard Warning	PHI	19 hr
Feb 10, 7:27 AM EST	Mesoscale Discussion	SPC	5 hr
Feb 10, 12:20 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 23, 3:30 PM EST	Winter Storm Watch	PHI	24 hr
Feb 24, 3:16 PM EST	Winter Storm Warning	PHI	48 hr
Feb 25, 11:17 AM EST	Wind Advisory	PHI	24 hr
Mar 2, 12:11 PM EST	Coastal Flood Advisory	PHI	42 hr
Mar 11, 3:42 PM EST	Flood Watch	PHI	59 hr
Mar 12, 2:35 AM EST	Wind Advisory	PHI	46 hr
Mar 12, 3:23 PM EST	Coastal Flood Advisory	PHI	41 hr
Mar 13, 10:06 AM EST	Areal Flood Advisory	PHI	8 hr
Mar 13, 2:50 PM EST	River Flood Warning	PHI	8 hr
Mar 13, 4:06 PM EST	River Flood Warning	PHI	6 hr
Mar 13, 4:10 PM EST	River Flood Warning	PHI	6 hr
Mar 13, 6:04 PM EST	Areal Flood Warning	PHI	8 hr
Mar 13, 11:10 PM EST	Coastal Flood Advisory	PHI	3 days
Mar 14, 3:23 PM EDT	Coastal Flood Advisory	PHI	63 hr
Mar 26, 9:40 PM EDT	Coastal Flood Advisory	PHI	11 hr
Mar 27, 3:39 PM EDT	Flood Watch	PHI	3 days
Mar 28, 4:13 AM EDT	Coastal Flood Advisory	PHI	68 hr
Mar 29, 12:56 AM EDT	Areal Flood Advisory	PHI	4 hr
Mar 29, 1:28 AM EDT	Flash Flood Warning	PHI	4 hr
Mar 29, 2:15 AM EDT	River Flood Warning	PHI	5 hr
Mar 30, 1:51 PM EDT	Areal Flood Warning	PHI	8 hr
Apr 1, 11:42 PM EDT	Coastal Flood Advisory	PHI	6 hr
Apr 8, 9:25 PM EDT	Severe Thunderstorm Warning	PHI	37 min
Apr 10, 10:50 AM EDT	Red Flag Warning	PHI	8 hr
Apr 16, 7:41 PM EDT	Severe Thunderstorm Warning	PHI	34 min
Apr 26, 4:10 AM EDT	Coastal Flood Advisory	PHI	23 hr
Apr 27, 2:34 PM EDT	Fire Weather Watch	PHI	14 hr
Apr 28, 4:12 AM EDT	Fire Weather Watch	PHI	16 hr
Apr 28, 4:12 AM EDT	Red Flag Warning	PHI	16 hr
Apr 28, 7:55 PM EDT	Red Flag Warning	PHI	24 hr
May 8, 4:15 AM EDT	Wind Advisory	PHI	25 hr
May 8, 2:02 PM EDT	Red Flag Warning	PHI	6 hr
May 8, 7:59 PM EDT	Fire Weather Watch	PHI	8 hr
May 9, 4:02 AM EDT	Red Flag Warning	PHI	16 hr
May 9, 3:57 PM EDT	Fire Weather Watch	PHI	12 hr
May 10, 4:17 AM EDT	Red Flag Warning	PHI	16 hr
May 10, 2:32 PM EDT	Frost Advisory	PHI	17 hr
May 14, 3:43 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
May 14, 6:35 PM EDT	Severe Thunderstorm Warning	PHI	55 min
May 14, 6:35 PM EDT	Mesoscale Discussion	SPC	55 min
May 14, 7:00 PM EDT	Severe Thunderstorm Warning	PHI	60 min
May 14, 7:08 PM EDT	Severe Thunderstorm Warning	PHI	67 min
May 14, 7:27 PM EDT	Severe Thunderstorm Warning	PHI	63 min
May 14, 9:05 PM EDT	Special Weather Statement	PHI	55 min
May 14, 9:06 PM EDT	Special Weather Statement	PHI	54 min
May 14, 9:57 PM EDT	Severe Thunderstorm Warning	PHI	48 min
May 27, 11:28 AM EDT	Mesoscale Discussion	SPC	92 min
May 27, 1:23 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
May 27, 4:13 PM EDT	Mesoscale Discussion	SPC	62 min
May 27, 7:56 PM EDT	Severe Thunderstorm Warning	PHI	34 min
May 27, 8:08 PM EDT	Mesoscale Discussion	SPC	97 min
May 27, 8:38 PM EDT	Severe Thunderstorm Warning	PHI	37 min
May 27, 11:46 PM EDT	Coastal Flood Advisory	PHI	4 hr
May 28, 1:11 AM EDT	Areal Flood Advisory	PHI	3 hr
Jun 1, 5:32 PM EDT	Special Weather Statement	PHI	43 min
Jun 3, 11:27 AM EDT	Mesoscale Discussion	SPC	93 min
Jun 3, 1:32 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 3, 3:36 PM EDT	Mesoscale Discussion	SPC	54 min
Jun 3, 6:28 PM EDT	Mesoscale Discussion	SPC	62 min
Jun 4, 2:39 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 4, 4:24 PM EDT	Mesoscale Discussion	SPC	66 min
Jun 4, 7:03 PM EDT	Mesoscale Discussion	SPC	57 min
Jun 6, 11:42 AM EDT	Mesoscale Discussion	SPC	63 min
Jun 6, 12:40 PM EDT	Tornado Watch	SPC	6 hr
Jun 6, 2:38 PM EDT	Mesoscale Discussion	SPC	67 min
Jun 13, 12:58 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 13, 9:45 PM EDT	Coastal Flood Statement	PHI	4 hr
Jun 21, 3:00 PM EDT	Excessive Heat Watch	PHI	37 hr
Jun 22, 4:38 AM EDT	Excessive Heat Warning	PHI	60 hr
Jun 22, 5:06 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Jun 22, 5:15 PM EDT	Special Weather Statement	PHI	60 min
Jun 22, 5:29 PM EDT	Special Weather Statement	PHI	46 min
Jun 22, 5:41 PM EDT	Severe Thunderstorm Warning	PHI	49 min
Jun 22, 6:29 PM EDT	Severe Thunderstorm Warning	PHI	46 min
Jun 22, 6:59 PM EDT	Mesoscale Discussion	SPC	61 min
Jun 22, 7:48 PM EDT	Special Weather Statement	PHI	42 min
Jun 22, 8:14 PM EDT	Special Weather Statement	PHI	61 min
Jun 24, 12:16 PM EDT	Mesoscale Discussion	SPC	89 min
Jun 24, 12:28 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 24, 2:56 PM EDT	Severe Thunderstorm Warning	PHI	64 min
Jun 24, 3:07 PM EDT	Mesoscale Discussion	SPC	53 min
Jun 24, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	61 min
Jun 24, 4:18 PM EDT	Severe Thunderstorm Warning	PHI	57 min
Jun 25, 1:38 PM EDT	Excessive Heat Watch	PHI	26 hr
Jun 26, 3:36 PM EDT	Excessive Heat Warning	PHI	51 hr
Jun 28, 1:12 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 28, 1:48 PM EDT	Special Weather Statement	PHI	87 min
Jun 28, 2:40 PM EDT	Special Weather Statement	PHI	95 min
Jun 28, 3:53 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 30, 4:12 AM EDT	Red Flag Warning	PHI	16 hr
Jul 1, 3:55 AM EDT	Red Flag Warning	PHI	16 hr
Jul 4, 3:21 PM EDT	Excessive Heat Watch	PHI	12 hr
Jul 5, 3:00 AM EDT	Excessive Heat Warning	PHI	65 hr
Jul 7, 3:33 AM EDT	Excessive Heat Watch	PHI	24 hr
Jul 7, 12:55 PM EDT	Red Flag Warning	PHI	9 hr
Jul 8, 3:26 AM EDT	Excessive Heat Warning	PHI	12 hr
Jul 10, 7:30 AM EDT	Areal Flood Advisory	PHI	6 hr
Jul 10, 9:00 AM EDT	Areal Flood Advisory	PHI	6 hr
Jul 13, 3:33 AM EDT	Special Weather Statement	PHI	57 min
Jul 13, 4:46 AM EDT	Special Weather Statement	PHI	59 min
Jul 13, 6:07 AM EDT	Areal Flood Advisory	PHI	113 min
Jul 13, 6:20 AM EDT	Flash Flood Warning	PHI	115 min
Jul 13, 6:30 AM EDT	Tornado Warning	PHI	45 min
Jul 13, 2:48 PM EDT	Flash Flood Watch	PHI	19 hr
Jul 13, 3:08 PM EDT	Excessive Heat Watch	PHI	63 hr
Jul 13, 9:52 PM EDT	Special Weather Statement	PHI	68 min
Jul 14, 1:44 AM EDT	Special Weather Statement	PHI	61 min
Jul 14, 2:40 AM EDT	Areal Flood Advisory	PHI	3 hr
Jul 14, 2:52 AM EDT	Flash Flood Warning	PHI	3 hr
Jul 14, 10:15 AM EDT	Flash Flood Watch	PHI	9 hr
Jul 14, 12:47 PM EDT	Areal Flood Advisory	PHI	3 hr
Jul 14, 12:52 PM EDT	Areal Flood Advisory	PHI	3 hr
Jul 14, 2:11 PM EDT	Flash Flood Warning	PHI	109 min
Jul 14, 4:03 PM EDT	Areal Flood Warning	PHI	79 min
Jul 16, 4:00 AM EDT	Excessive Heat Watch	PHI	36 hr
Jul 16, 4:00 AM EDT	Heat Advisory	PHI	16 hr
Jul 16, 4:07 PM EDT	Heat Advisory	PHI	23 hr
Jul 17, 2:04 AM EDT	Special Weather Statement	PHI	86 min
Jul 19, 9:14 AM EDT	Special Weather Statement	PHI	61 min
Jul 19, 6:22 PM EDT	Severe Thunderstorm Warning	PHI	53 min
Jul 19, 6:52 PM EDT	Special Weather Statement	PHI	68 min
Jul 19, 7:39 PM EDT	Mesoscale Discussion	SPC	96 min
Jul 20, 1:12 PM EDT	Special Weather Statement	PHI	63 min
Jul 20, 9:03 PM EDT	Special Weather Statement	PHI	57 min
Jul 21, 1:32 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 21, 3:41 PM EDT	Mesoscale Discussion	SPC	64 min
Jul 22, 2:06 PM EDT	Excessive Heat Watch	PHI	25 hr
Jul 23, 3:24 PM EDT	Excessive Heat Warning	PHI	48 hr
Jul 23, 6:23 PM EDT	Mesoscale Discussion	SPC	67 min
Jul 25, 10:48 AM EDT	Mesoscale Discussion	SPC	27 min
Jul 25, 11:29 AM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 25, 12:50 PM EDT	Mesoscale Discussion	SPC	55 min
Jul 25, 2:25 PM EDT	Severe Thunderstorm Warning	PHI	80 min
Jul 25, 2:45 PM EDT	Tornado Warning	PHI	30 min
Jul 25, 3:22 PM EDT	Severe Thunderstorm Warning	PHI	53 min
Jul 25, 3:25 PM EDT	Mesoscale Discussion	SPC	65 min
Jul 29, 11:54 AM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 29, 2:28 PM EDT	Special Weather Statement	PHI	92 min
Aug 4, 2:56 PM EDT	Heat Advisory	PHI	29 hr
Aug 4, 8:36 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Aug 4, 10:08 PM EDT	Special Weather Statement	PHI	52 min
Aug 4, 10:17 PM EDT	Special Weather Statement	PHI	43 min
Aug 4, 10:47 PM EDT	Special Weather Statement	PHI	28 min
Aug 9, 2:45 PM EDT	Heat Advisory	PHI	29 hr
Aug 12, 4:02 AM EDT	Coastal Flood Advisory	PHI	35 hr
Aug 12, 7:56 AM EDT	Special Weather Statement	PHI	2 hr
Aug 12, 8:31 AM EDT	Special Weather Statement	PHI	59 min
Aug 12, 9:27 AM EDT	Areal Flood Advisory	PHI	3 hr
Aug 12, 3:10 PM EDT	Areal Flood Advisory	PHI	3 hr
Aug 13, 2:54 PM EDT	Coastal Flood Statement	PHI	16 hr
Aug 16, 2:01 PM EDT	Mesoscale Discussion	SPC	89 min
Aug 16, 9:52 PM EDT	Special Weather Statement	PHI	113 min
Aug 22, 2:32 PM EDT	Special Weather Statement	PHI	58 min
Aug 22, 3:29 PM EDT	Special Weather Statement	PHI	61 min
Sep 4, 4:19 AM EDT	Red Flag Warning	PHI	13 hr
Sep 7, 4:27 AM EDT	Fire Weather Watch	PHI	11 hr
Sep 7, 3:42 PM EDT	Red Flag Warning	PHI	27 hr
Sep 14, 11:00 AM EDT	Red Flag Warning	PHI	7 hr
Sep 16, 4:36 PM EDT	Severe Thunderstorm Warning	PHI	54 min
Sep 16, 4:37 PM EDT	Mesoscale Discussion	SPC	53 min
Sep 22, 3:10 PM EDT	Mesoscale Discussion	SPC	65 min
Sep 22, 3:43 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Sep 22, 4:46 PM EDT	Mesoscale Discussion	SPC	59 min
Sep 22, 7:14 PM EDT	Mesoscale Discussion	SPC	61 min
Sep 22, 8:30 PM EDT	Special Weather Statement	PHI	45 min
Sep 22, 9:10 PM EDT	Severe Thunderstorm Warning	PHI	65 min
Sep 27, 1:03 PM EDT	Mesoscale Discussion	SPC	87 min
Sep 28, 7:33 AM EDT	Special Weather Statement	PHI	57 min
Sep 28, 8:00 AM EDT	Mesoscale Discussion	SPC	2 hr
Sep 28, 8:47 AM EDT	Special Weather Statement	PHI	58 min
Sep 28, 9:26 AM EDT	Special Weather Statement	PHI	64 min
Sep 28, 10:17 AM EDT	Special Weather Statement	PHI	58 min
Sep 28, 10:22 AM EDT	Severe Thunderstorm Warning	PHI	53 min
Sep 28, 11:15 AM EDT	Severe Thunderstorm Warning	PHI	45 min
Sep 28, 1:50 PM EDT	Mesoscale Discussion	SPC	55 min
Sep 29, 3:52 AM EDT	Flood Watch	PHI	49 hr
Sep 29, 3:19 PM EDT	Coastal Flood Advisory	PHI	30 hr
Sep 29, 3:24 PM EDT	Wind Advisory	PHI	38 hr
Sep 30, 4:55 AM EDT	Tornado Watch	SPC	8 hr
Sep 30, 8:25 AM EDT	Mesoscale Discussion	SPC	95 min
Sep 30, 10:49 AM EDT	Mesoscale Discussion	SPC	116 min
Sep 30, 12:39 PM EDT	Tornado Watch	SPC	6 hr
Sep 30, 1:48 PM EDT	Areal Flood Warning	PHI	6 hr
Sep 30, 1:51 PM EDT	Coastal Flood Warning	PHI	5 hr
Sep 30, 3:16 PM EDT	Mesoscale Discussion	SPC	119 min
Sep 30, 7:50 PM EDT	Areal Flood Warning	PHI	16 hr
Oct 1, 12:01 AM EDT	Mesoscale Discussion	SPC	89 min
Oct 1, 12:40 AM EDT	Special Weather Statement	PHI	65 min
Oct 1, 12:49 AM EDT	River Flood Warning	PHI	14 hr
Oct 1, 1:08 AM EDT	River Flood Warning	PHI	14 hr
Oct 1, 1:22 AM EDT	Special Weather Statement	PHI	53 min
Oct 1, 2:08 AM EDT	River Flood Warning	PHI	12 hr
Oct 1, 2:23 AM EDT	River Flood Warning	PHI	23 hr
Oct 3, 4:23 AM EDT	Coastal Flood Advisory	PHI	43 hr
Oct 4, 4:30 AM EDT	Coastal Flood Advisory	PHI	15 hr
Oct 11, 11:10 PM EDT	Special Weather Statement	PHI	65 min
Oct 27, 11:54 AM EDT	Mesoscale Discussion	SPC	66 min
Oct 27, 12:13 PM EDT	Tornado Watch	SPC	8 hr
Oct 27, 2:01 PM EDT	Special Weather Statement	PHI	59 min
Oct 29, 3:24 PM EDT	Frost Advisory	PHI	13 hr
Oct 31, 3:48 AM EDT	Freeze Watch	PHI	11 hr
Oct 31, 3:03 PM EDT	Frost Advisory	PHI	17 hr
Nov 1, 3:58 AM EDT	Freeze Watch	PHI	11 hr
Nov 1, 3:10 PM EDT	Freeze Warning	PHI	17 hr
Nov 3, 8:30 PM EDT	Coastal Flood Advisory	PHI	14 hr
Nov 10, 1:32 PM EST	Coastal Flood Advisory	PHI	29 hr
Nov 12, 4:31 AM EST	Coastal Flood Advisory	PHI	11 hr
Nov 14, 11:02 PM EST	Dense Fog Advisory	PHI	11 hr
Nov 15, 3:16 PM EST	Dense Fog Advisory	PHI	12 hr
Nov 16, 3:27 PM EST	Wind Advisory	PHI	27 hr
Nov 17, 12:06 AM EST	Severe Thunderstorm Watch	SPC	4 hr
Nov 17, 1:59 AM EST	Special Weather Statement	PHI	61 min
Nov 17, 2:03 AM EST	Severe Thunderstorm Warning	PHI	57 min
Nov 30, 3:15 PM EST	Wind Advisory	PHI	23 hr
Nov 30, 3:30 PM EST	Coastal Flood Advisory	PHI	20 hr
Dec 1, 6:48 AM EST	Special Weather Statement	PHI	57 min
Dec 1, 7:43 AM EST	Special Weather Statement	PHI	47 min
Dec 1, 8:36 AM EST	Special Weather Statement	PHI	54 min
Dec 1, 8:58 AM EST	Areal Flood Advisory	PHI	6 hr
Dec 1, 9:31 AM EST	Special Weather Statement	PHI	59 min
Dec 1, 10:17 AM EST	Special Weather Statement	PHI	43 min
Dec 1, 10:33 AM EST	Severe Thunderstorm Warning	PHI	42 min
Dec 1, 10:49 AM EST	Special Weather Statement	PHI	56 min
Dec 1, 11:35 AM EST	Severe Thunderstorm Warning	PHI	40 min
Dec 16, 11:47 AM EST	Winter Weather Advisory	PHI	7 hr
Dec 25, 4:16 AM EST	Winter Storm Watch	PHI	11 hr
Dec 25, 3:24 PM EST	Winter Storm Warning	PHI	38 hr
Dec 27, 4:14 AM EST	Wind Advisory	PHI	17 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	25
Tornado Warning	2
Severe Thunderstorm Watch	13
Tornado Watch	4
Mesoscale Discussion	41
Special Weather Statement	43
Flooding
Areal Flood Warning	5
Flash Flood Warning	4
River Flood Warning	9
Flash Flood Watch	2
Flood Watch	4
Areal Flood Advisory	13
Winter
Blizzard Warning	1
Winter Storm Warning	5
Winter Storm Watch	4
Winter Weather Advisory	4
Heat
Excessive Heat Warning	5
Excessive Heat Watch	7
Heat Advisory	4
Cold
Freeze Warning	1
Freeze Watch	2
Frost Advisory	3
Wind and dust
Wind Advisory	9
Fire
Red Flag Warning	12
Fire Weather Watch	5
Fog and smoke
Dense Fog Advisory	2
Coast and beach
Coastal Flood Warning	1
Coastal Flood Advisory	18
Coastal Flood Statement	2

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.