Alert archive / South Carolina / Horry County

Weather alerts in Horry County, South Carolina, 2011

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

Horry County and its neighbors

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

Alerts: 217
Warnings: 58
Watches: 20
Advisories: 36
Busiest month: August37 alerts
Busiest day: April 16, 201114 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 6 tornado warnings covering Horry County in 2011 had a tornado report inside them.

Horry County, 2011

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	6	2	67%	0
Severe thunderstorm warnings	46	39	15%	69	88%	21 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 Wilmington, NC: tornado warnings	32	10	69%	18	78%	23 min
NWS Wilmington, NC: severe thunderstorm warnings	166	123	26%	383	83%	28 min
NWS Wilmington, NC: flash flood warnings	2	1	50%	3	100%	39 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 10, 11:27 AM EST	Mesoscale Discussion	SPC	6 hr
Feb 28, 7:53 PM EST	Severe Thunderstorm Warning	ILM	67 min
Mar 6, 3:49 PM EST	Mesoscale Discussion	SPC	86 min
Mar 10, 2:49 PM EST	Special Weather Statement	ILM	56 min
Mar 10, 3:27 PM EST	Special Weather Statement	ILM	48 min
Apr 5, 3:34 AM EDT	Mesoscale Discussion	SPC	116 min
Apr 5, 4:00 AM EDT	Tornado Watch	SPC	6 hr
Apr 5, 4:53 AM EDT	Severe Thunderstorm Warning	ILM	82 min
Apr 5, 6:15 AM EDT	Severe Thunderstorm Warning	ILM	90 min
Apr 5, 6:20 AM EDT	Severe Thunderstorm Warning	ILM	25 min
Apr 5, 6:44 AM EDT	Severe Thunderstorm Warning	ILM	46 min
Apr 5, 9:58 AM EDT	Special Weather Statement	ILM	32 min
Apr 9, 7:59 PM EDT	Mesoscale Discussion	SPC	61 min
Apr 9, 8:21 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 9, 8:56 PM EDT	Severe Thunderstorm Warning	ILM	79 min
Apr 9, 10:39 PM EDT	Mesoscale Discussion	SPC	66 min
Apr 16, 10:39 AM EDT	Mesoscale Discussion	SPC	2 hr
Apr 16, 12:02 PM EDT	Tornado Watch PDS	SPC	11 hr
Apr 16, 12:07 PM EDT	Tornado Warning	ILM	37 min
Apr 16, 12:16 PM EDT	Mesoscale Discussion	SPC	59 min
Apr 16, 1:16 PM EDT	Special Weather Statement	ILM	29 min
Apr 16, 2:28 PM EDT	Mesoscale Discussion	SPC	92 min
Apr 16, 3:40 PM EDT	Severe Thunderstorm Warning	ILM	35 min
Apr 16, 4:17 PM EDT	Tornado Warning	ILM	58 min
Apr 16, 4:49 PM EDT	Severe Thunderstorm Warning	ILM	41 min
Apr 16, 4:49 PM EDT	Mesoscale Discussion	SPC	86 min
Apr 16, 5:03 PM EDT	Tornado Warning	ILM	42 min
Apr 16, 5:03 PM EDT	Tornado Warning	ILM	57 min
Apr 16, 5:48 PM EDT	Severe Thunderstorm Warning	ILM	42 min
Apr 16, 6:59 PM EDT	Mesoscale Discussion	SPC	91 min
Apr 26, 2:16 PM EDT	Mesoscale Discussion	SPC	59 min
Apr 27, 12:51 PM EDT	Mesoscale Discussion	SPC	84 min
Apr 28, 8:48 AM EDT	Tornado Watch	SPC	7 hr
Apr 28, 9:40 AM EDT	Special Weather Statement	ILM	50 min
Apr 28, 10:16 AM EDT	Tornado Warning	ILM	44 min
Apr 28, 10:41 AM EDT	Severe Thunderstorm Warning	ILM	64 min
Apr 28, 11:22 AM EDT	Mesoscale Discussion	SPC	53 min
Apr 28, 2:24 PM EDT	Severe Thunderstorm Warning	ILM	51 min
Apr 28, 3:19 PM EDT	Tornado Watch	SPC	4 hr
Apr 28, 3:55 PM EDT	Special Weather Statement	ILM	50 min
May 6, 10:45 PM EDT	Dense Fog Advisory	ILM	10 hr
May 10, 2:18 PM EDT	Mesoscale Discussion	SPC	87 min
May 10, 3:20 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
May 10, 4:33 PM EDT	Severe Thunderstorm Warning	ILM	42 min
May 10, 5:15 PM EDT	Severe Thunderstorm Warning	ILM	30 min
May 10, 5:39 PM EDT	Tornado Warning	ILM	30 min
May 10, 6:02 PM EDT	Mesoscale Discussion	SPC	58 min
May 10, 6:13 PM EDT	Severe Thunderstorm Warning	ILM	77 min
May 10, 6:40 PM EDT	Severe Thunderstorm Warning	ILM	50 min
May 10, 9:01 PM EDT	Mesoscale Discussion	SPC	59 min
May 11, 1:41 AM EDT	Severe Thunderstorm Watch	SPC	3 hr
May 11, 2:39 AM EDT	Severe Thunderstorm Warning	ILM	51 min
May 11, 2:43 AM EDT	Severe Thunderstorm Warning	ILM	51 min
May 11, 3:02 AM EDT	Severe Thunderstorm Warning	ILM	73 min
May 11, 3:34 AM EDT	Mesoscale Discussion	SPC	56 min
May 14, 12:34 PM EDT	Severe Thunderstorm Warning	ILM	41 min
May 14, 1:06 PM EDT	Special Weather Statement	ILM	24 min
May 14, 1:19 PM EDT	Severe Thunderstorm Warning	ILM	56 min
May 14, 1:42 PM EDT	Areal Flood Advisory	ILM	63 min
May 14, 1:44 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
May 16, 2:26 PM EDT	Coastal Flood Advisory	ILM	10 hr
May 17, 6:51 PM EDT	Mesoscale Discussion	SPC	114 min
May 17, 9:09 PM EDT	Areal Flood Advisory	ILM	52 min
May 20, 6:18 PM EDT	Special Weather Statement	ILM	27 min
May 27, 3:29 PM EDT	Mesoscale Discussion	SPC	91 min
May 27, 6:24 PM EDT	Mesoscale Discussion	SPC	66 min
May 27, 7:15 PM EDT	Areal Flood Advisory	ILM	60 min
Jun 5, 4:15 PM EDT	Mesoscale Discussion	SPC	60 min
Jun 5, 8:52 PM EDT	Special Weather Statement	ILM	23 min
Jun 12, 9:19 PM EDT	Severe Thunderstorm Warning	ILM	56 min
Jun 14, 3:10 AM EDT	Special Weather Statement	ILM	35 min
Jun 14, 3:27 AM EDT	Severe Thunderstorm Warning	ILM	33 min
Jun 18, 6:38 PM EDT	Severe Thunderstorm Warning	ILM	67 min
Jun 18, 7:20 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 18, 7:33 PM EDT	Special Weather Statement	ILM	42 min
Jun 19, 1:29 PM EDT	Mesoscale Discussion	SPC	61 min
Jun 19, 1:48 PM EDT	Severe Thunderstorm Warning	ILM	57 min
Jun 19, 2:20 PM EDT	Severe Thunderstorm Warning	ILM	27 min
Jun 19, 2:22 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 19, 3:01 PM EDT	Special Weather Statement	ILM	29 min
Jun 19, 3:15 PM EDT	Severe Thunderstorm Warning	ILM	60 min
Jun 19, 3:54 PM EDT	Areal Flood Advisory	ILM	37 min
Jun 19, 4:13 PM EDT	Mesoscale Discussion	SPC	62 min
Jun 21, 3:16 AM EDT	Heat Advisory	ILM	14 hr
Jun 21, 3:07 PM EDT	Special Weather Statement	ILM	68 min
Jun 21, 3:47 PM EDT	Special Weather Statement	ILM	43 min
Jun 22, 3:33 AM EDT	Heat Advisory	ILM	15 hr
Jun 23, 1:40 PM EDT	Mesoscale Discussion	SPC	3 hr
Jun 23, 2:36 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 23, 4:59 PM EDT	Severe Thunderstorm Warning	ILM	46 min
Jun 23, 5:20 PM EDT	Severe Thunderstorm Warning	ILM	55 min
Jun 23, 5:29 PM EDT	Severe Thunderstorm Warning	ILM	50 min
Jun 23, 5:40 PM EDT	Severe Thunderstorm Warning	ILM	35 min
Jun 23, 6:13 PM EDT	Severe Thunderstorm Warning	ILM	47 min
Jun 23, 7:17 PM EDT	Special Weather Statement	ILM	58 min
Jun 26, 3:56 PM EDT	Special Weather Statement	ILM	64 min
Jun 26, 5:14 PM EDT	Special Weather Statement	ILM	61 min
Jun 27, 1:15 PM EDT	Mesoscale Discussion	SPC	60 min
Jun 27, 1:34 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 27, 3:06 PM EDT	Special Weather Statement	ILM	54 min
Jun 27, 4:07 PM EDT	Mesoscale Discussion	SPC	83 min
Jul 1, 3:29 AM EDT	Dense Fog Advisory	ILM	6 hr
Jul 1, 2:40 PM EDT	Severe Thunderstorm Warning	ILM	65 min
Jul 1, 5:02 PM EDT	Special Weather Statement	ILM	88 min
Jul 1, 7:20 PM EDT	Special Weather Statement	ILM	40 min
Jul 2, 2:55 PM EDT	Severe Thunderstorm Warning	ILM	50 min
Jul 6, 12:46 PM EDT	Special Weather Statement	ILM	74 min
Jul 6, 12:53 PM EDT	Mesoscale Discussion	SPC	97 min
Jul 6, 2:55 PM EDT	Special Weather Statement	ILM	65 min
Jul 8, 10:55 AM EDT	Areal Flood Advisory	ILM	34 min
Jul 9, 1:18 PM EDT	Mesoscale Discussion	SPC	87 min
Jul 9, 2:43 PM EDT	Areal Flood Advisory	ILM	98 min
Jul 11, 3:33 PM EDT	Heat Advisory	ILM	29 hr
Jul 12, 3:40 PM EDT	Heat Advisory	ILM	28 hr
Jul 13, 2:56 PM EDT	Special Weather Statement	ILM	64 min
Jul 13, 4:55 PM EDT	Special Weather Statement	ILM	50 min
Jul 13, 5:10 PM EDT	Severe Thunderstorm Warning	ILM	50 min
Jul 13, 5:58 PM EDT	Special Weather Statement	ILM	62 min
Jul 15, 6:34 PM EDT	Coastal Flood Advisory	ILM	5 hr
Jul 20, 3:00 PM EDT	Heat Advisory	ILM	29 hr
Jul 21, 3:21 PM EDT	Special Weather Statement	ILM	54 min
Jul 21, 3:22 PM EDT	Excessive Heat Warning	ILM	29 hr
Jul 22, 3:09 PM EDT	Excessive Heat Warning	ILM	29 hr
Jul 22, 4:09 PM EDT	Special Weather Statement	ILM	36 min
Jul 23, 3:18 PM EDT	Excessive Heat Warning	ILM	27 hr
Jul 23, 3:47 PM EDT	Special Weather Statement	ILM	28 min
Jul 23, 4:26 PM EDT	Areal Flood Advisory	ILM	51 min
Jul 23, 4:36 PM EDT	Severe Thunderstorm Warning	ILM	25 min
Jul 25, 3:48 AM EDT	Heat Advisory	ILM	13 hr
Jul 25, 7:23 PM EDT	Mesoscale Discussion	SPC	67 min
Jul 25, 10:38 PM EDT	Special Weather Statement	ILM	52 min
Jul 29, 3:37 PM EDT	Heat Advisory	ILM	28 hr
Jul 31, 2:15 AM EDT	Heat Advisory	ILM	14 hr
Jul 31, 1:22 PM EDT	Mesoscale Discussion	SPC	83 min
Jul 31, 1:35 PM EDT	Severe Thunderstorm Warning	ILM	55 min
Jul 31, 2:21 PM EDT	Severe Thunderstorm Warning	ILM	42 min
Aug 3, 3:15 AM EDT	Heat Advisory	ILM	17 hr
Aug 3, 3:19 PM EDT	Heat Advisory	ILM	29 hr
Aug 4, 2:59 PM EDT	Heat Advisory	ILM	29 hr
Aug 4, 7:03 PM EDT	Special Weather Statement	ILM	42 min
Aug 5, 11:14 AM EDT	Special Weather Statement	ILM	61 min
Aug 5, 11:24 AM EDT	Special Weather Statement	ILM	51 min
Aug 5, 12:14 PM EDT	Special Weather Statement	ILM	91 min
Aug 5, 6:19 PM EDT	Special Weather Statement	ILM	41 min
Aug 6, 3:37 AM EDT	Heat Advisory	ILM	15 hr
Aug 6, 2:08 PM EDT	Special Weather Statement	ILM	52 min
Aug 6, 3:47 PM EDT	Areal Flood Advisory	ILM	118 min
Aug 7, 3:18 AM EDT	Heat Advisory	ILM	17 hr
Aug 7, 2:52 PM EDT	Heat Advisory	ILM	29 hr
Aug 8, 3:16 PM EDT	Heat Advisory	ILM	28 hr
Aug 11, 8:38 PM EDT	Severe Thunderstorm Warning	ILM	37 min
Aug 11, 9:08 PM EDT	Severe Thunderstorm Warning	ILM	45 min
Aug 12, 1:46 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 14, 2:40 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 14, 7:46 PM EDT	Special Weather Statement	ILM	59 min
Aug 20, 4:48 PM EDT	Special Weather Statement	ILM	42 min
Aug 20, 7:00 PM EDT	Tropical Storm Warning	NHC	8 days
Aug 21, 4:30 PM EDT	Special Weather Statement	ILM	30 min
Aug 21, 5:54 PM EDT	Severe Thunderstorm Warning	ILM	51 min
Aug 22, 1:31 AM EDT	Special Weather Statement	ILM	59 min
Aug 22, 2:02 PM EDT	Mesoscale Discussion	SPC	58 min
Aug 24, 3:59 PM EDT	Rip Current Statement	ILM	28 hr
Aug 25, 5:00 AM EDT	Tropical Storm Watch	NHC	54 hr
Aug 25, 5:09 AM EDT	Tropical Storm Watch	ILM	12 hr
Aug 25, 3:29 PM EDT	Flash Flood Watch	ILM	48 hr
Aug 25, 5:15 PM EDT	Tropical Storm Warning	ILM	47 hr
Aug 26, 5:11 PM EDT	Areal Flood Warning	ILM	2 hr
Aug 29, 5:37 AM EDT	Dense Fog Advisory	ILM	2 hr
Aug 29, 11:08 AM EDT	Mesoscale Discussion	SPC	97 min
Aug 29, 2:13 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 29, 3:56 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Aug 29, 5:11 PM EDT	Severe Thunderstorm Warning	ILM	43 min
Aug 29, 7:53 PM EDT	Mesoscale Discussion	SPC	67 min
Sep 4, 9:44 PM EDT	Rip Current Statement	ILM	4 days
Sep 5, 5:48 PM EDT	Mesoscale Discussion	SPC	87 min
Sep 6, 5:17 AM EDT	Tornado Watch	SPC	9 hr
Sep 6, 5:37 AM EDT	Special Weather Statement	ILM	53 min
Sep 6, 8:35 AM EDT	Mesoscale Discussion	SPC	85 min
Sep 6, 12:14 PM EDT	Special Weather Statement	ILM	61 min
Sep 6, 12:41 PM EDT	Mesoscale Discussion	SPC	64 min
Sep 6, 1:32 PM EDT	Tornado Watch	SPC	7 hr
Sep 6, 1:38 PM EDT	Special Weather Statement	ILM	67 min
Sep 6, 4:41 PM EDT	Mesoscale Discussion	SPC	64 min
Sep 6, 7:33 PM EDT	Mesoscale Discussion	SPC	117 min
Sep 12, 2:31 PM EDT	Mesoscale Discussion	SPC	89 min
Sep 12, 5:15 PM EDT	Special Weather Statement	ILM	60 min
Sep 12, 5:58 PM EDT	Severe Thunderstorm Warning	ILM	62 min
Sep 21, 1:30 PM EDT	Special Weather Statement	ILM	60 min
Sep 22, 2:09 PM EDT	Special Weather Statement	ILM	51 min
Sep 28, 8:09 PM EDT	Special Weather Statement	ILM	51 min
Sep 30, 5:32 PM EDT	Mesoscale Discussion	SPC	88 min
Sep 30, 7:12 PM EDT	Special Weather Statement	ILM	63 min
Sep 30, 7:48 PM EDT	Special Weather Statement	ILM	27 min
Oct 8, 3:46 PM EDT	Rip Current Statement	ILM	3 days
Oct 10, 4:56 AM EDT	High Surf Advisory	ILM	29 hr
Oct 10, 3:47 PM EDT	Coastal Flood Advisory	ILM	6 hr
Oct 12, 6:43 PM EDT	Areal Flood Advisory	ILM	77 min
Oct 13, 9:53 PM EDT	Severe Thunderstorm Warning	ILM	67 min
Oct 13, 10:55 PM EDT	Special Weather Statement	ILM	65 min
Oct 18, 5:46 AM EDT	Dense Fog Advisory	ILM	3 hr
Oct 19, 3:46 PM EDT	Mesoscale Discussion	SPC	89 min
Nov 4, 5:58 PM EDT	Wind Advisory	ILM	17 hr
Nov 11, 2:16 AM EST	Frost Advisory	ILM	31 hr
Nov 16, 4:06 PM EST	Mesoscale Discussion	SPC	114 min
Nov 16, 4:30 PM EST	Tornado Watch	SPC	7 hr
Nov 16, 6:48 PM EST	Mesoscale Discussion	SPC	87 min
Nov 16, 8:27 PM EST	Severe Thunderstorm Warning	ILM	63 min
Nov 16, 8:45 PM EST	Severe Thunderstorm Warning	ILM	60 min
Nov 16, 9:06 PM EST	Severe Thunderstorm Warning	ILM	35 min
Nov 16, 10:20 PM EST	Mesoscale Discussion	SPC	55 min
Nov 28, 10:21 PM EST	Special Weather Statement	ILM	54 min
Dec 6, 12:12 AM EST	Dense Fog Advisory	ILM	9 hr
Dec 7, 5:06 PM EST	Special Weather Statement	ILM	39 min
Dec 7, 5:32 PM EST	Special Weather Statement	ILM	43 min
Dec 27, 4:05 AM EST	Wind Advisory	ILM	14 hr
Dec 27, 12:05 PM EST	Mesoscale Discussion	SPC	55 min
Dec 27, 1:14 PM EST	Special Weather Statement	ILM	46 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	46
Tornado Warning	6
Severe Thunderstorm Watch	10
Tornado Watch	7
Mesoscale Discussion	47
Special Weather Statement	53
Flooding
Areal Flood Warning	1
Flash Flood Watch	1
Areal Flood Advisory	9
Heat
Excessive Heat Warning	3
Heat Advisory	15
Cold
Frost Advisory	1
Wind and dust
Wind Advisory	2
Fog and smoke
Dense Fog Advisory	5
Tropical
Tropical Storm Warning	2
Tropical Storm Watch	2
Coast and beach
Coastal Flood Advisory	3
High Surf Advisory	1
Rip Current Statement	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.