Alert archive / South Carolina / Horry County

Weather alerts in Horry County, South Carolina, 2018

226 weather alerts in 2018, 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 2018. Tap one for its archive.

Alerts: 226
Warnings: 60
Watches: 22
Advisories: 45
Busiest month: September46 alerts
Busiest day: September 16, 201815 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 9 tornado warnings covering Horry County in 2018 had a tornado report inside them; 2 of 4 tornado reports fell inside a warning, on average 4 minutes after it went out.

Horry County, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	9	2	78%	4	50%	4 min
Severe thunderstorm warnings	16	9	44%	14	50%	9 min
Flash flood warnings	11	8	27%	10	40%	83 min

Each office's whole area, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Wilmington, NC: tornado warnings	37	14	62%	22	73%	12 min
NWS Wilmington, NC: severe thunderstorm warnings	56	28	50%	74	68%	16 min
NWS Wilmington, NC: flash flood warnings	30	19	37%	199	90%	391 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 1, 1:47 AM EST	Wind Chill Advisory	ILM	32 hr
Jan 2, 3:13 AM EST	Winter Storm Watch	ILM	12 hr
Jan 2, 3:20 PM EST	Winter Storm Warning	ILM	36 hr
Jan 3, 3:52 AM EST	Coastal Flood Advisory	ILM	6 hr
Jan 3, 6:23 PM EST	Special Weather Statement	ILM	52 min
Jan 4, 3:03 AM EST	Wind Chill Advisory	ILM	31 hr
Jan 5, 3:06 PM EST	Wind Chill Advisory	ILM	18 hr
Jan 6, 3:07 PM EST	Wind Chill Advisory	ILM	19 hr
Jan 12, 6:46 PM EST	Mesoscale Discussion	SPC	2 hr
Jan 28, 2:43 PM EST	Dense Fog Advisory	ILM	7 hr
Jan 28, 5:47 PM EST	Flash Flood Watch	ILM	14 hr
Feb 10, 3:31 AM EST	Dense Fog Advisory	ILM	9 hr
Feb 19, 9:18 PM EST	Dense Fog Advisory	ILM	14 hr
Feb 21, 4:19 AM EST	Dense Fog Advisory	ILM	5 hr
Feb 22, 2:45 AM EST	Dense Fog Advisory	ILM	7 hr
Mar 1, 2:05 PM EST	Mesoscale Discussion	SPC	2 hr
Mar 1, 2:59 PM EST	Wind Advisory	ILM	27 hr
Mar 1, 5:04 PM EST	Severe Thunderstorm Warning	ILM	56 min
Mar 3, 4:02 AM EST	Red Flag Warning	ILM	14 hr
Mar 8, 3:10 AM EST	Freeze Warning	ILM	29 hr
Mar 12, 4:24 AM EDT	Freeze Watch	ILM	11 hr
Mar 12, 3:18 PM EDT	Freeze Warning	ILM	18 hr
Mar 14, 3:13 AM EDT	Freeze Warning	ILM	30 hr
Mar 14, 3:06 PM EDT	Fire Weather Watch	ILM	11 hr
Mar 15, 2:27 AM EDT	Red Flag Warning	ILM	17 hr
Mar 20, 9:11 PM EDT	Special Weather Statement	ILM	34 min
Mar 20, 9:22 PM EDT	Severe Thunderstorm Warning	ILM	38 min
Mar 20, 9:49 PM EDT	Severe Thunderstorm Warning	ILM	41 min
Mar 20, 10:45 PM EDT	Special Weather Statement	ILM	45 min
Mar 22, 3:02 PM EDT	Freeze Warning	ILM	18 hr
Apr 7, 1:55 PM EDT	Special Weather Statement	ILM	65 min
Apr 14, 1:33 PM EDT	Beach Hazards Statement	ILM	30 hr
Apr 15, 3:02 PM EDT	Tornado Watch	SPC	8 hr
Apr 15, 5:45 PM EDT	Mesoscale Discussion	SPC	90 min
Apr 15, 6:19 PM EDT	Wind Advisory	ILM	7 hr
Apr 15, 7:52 PM EDT	Severe Thunderstorm Warning	ILM	53 min
Apr 15, 8:31 PM EDT	Mesoscale Discussion	SPC	89 min
Apr 15, 8:46 PM EDT	Special Weather Statement	ILM	59 min
Apr 22, 3:53 PM EDT	Wind Advisory	ILM	40 hr
Apr 22, 4:23 PM EDT	Rip Current Statement	ILM	52 hr
Apr 23, 7:56 PM EDT	Coastal Flood Advisory	ILM	12 hr
Apr 24, 5:15 AM EDT	Rip Current Statement	ILM	15 hr
May 27, 7:47 AM EDT	Flash Flood Watch	ILM	55 hr
May 27, 3:11 PM EDT	Rip Current Statement	ILM	29 hr
May 28, 5:36 AM EDT	Beach Hazards Statement	ILM	14 hr
May 28, 8:05 AM EDT	Special Weather Statement	ILM	55 min
May 28, 8:41 AM EDT	Areal Flood Advisory	ILM	2 hr
May 28, 10:12 AM EDT	Flash Flood Warning	ILM	2 hr
May 28, 3:57 PM EDT	Rip Current Statement	ILM	28 hr
May 31, 9:51 PM EDT	Special Weather Statement	ILM	24 min
Jun 2, 9:20 PM EDT	Severe Thunderstorm Warning	ILM	25 min
Jun 10, 2:34 PM EDT	Rip Current Statement	ILM	5 hr
Jun 11, 7:20 PM EDT	Special Weather Statement	ILM	55 min
Jun 11, 8:13 PM EDT	Areal Flood Advisory	ILM	92 min
Jun 11, 9:40 PM EDT	Areal Flood Advisory	ILM	95 min
Jun 14, 3:00 PM EDT	Special Weather Statement	ILM	30 min
Jun 14, 3:27 PM EDT	Special Weather Statement	ILM	33 min
Jun 14, 4:18 PM EDT	Special Weather Statement	ILM	57 min
Jun 14, 4:20 PM EDT	Special Weather Statement	ILM	55 min
Jun 14, 5:11 PM EDT	Special Weather Statement	ILM	64 min
Jun 14, 5:37 PM EDT	Severe Thunderstorm Warning	ILM	41 min
Jun 15, 2:58 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 15, 3:51 PM EDT	Severe Thunderstorm Warning	ILM	15 min
Jun 17, 7:42 PM EDT	Beach Hazards Statement	ILM	25 hr
Jun 18, 8:27 PM EDT	Beach Hazards Statement	ILM	25 hr
Jun 19, 3:22 AM EDT	Heat Advisory	ILM	17 hr
Jun 19, 4:01 PM EDT	Heat Advisory	ILM	28 hr
Jun 19, 8:35 PM EDT	Beach Hazards Statement	ILM	8 hr
Jun 20, 8:23 PM EDT	Special Weather Statement	ILM	37 min
Jun 20, 9:10 PM EDT	Special Weather Statement	ILM	65 min
Jun 21, 6:00 AM EDT	Heat Advisory	ILM	10 hr
Jun 22, 7:36 PM EDT	Beach Hazards Statement	ILM	24 hr
Jun 23, 3:30 PM EDT	Heat Advisory	ILM	29 hr
Jun 23, 7:41 PM EDT	Beach Hazards Statement	ILM	24 hr
Jun 24, 8:43 PM EDT	Severe Thunderstorm Warning	ILM	47 min
Jun 24, 9:16 PM EDT	Severe Thunderstorm Warning	ILM	59 min
Jun 24, 9:33 PM EDT	Severe Thunderstorm Warning	ILM	57 min
Jun 24, 10:04 PM EDT	Special Weather Statement	ILM	56 min
Jun 25, 1:02 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jun 25, 5:09 PM EDT	Severe Thunderstorm Warning	ILM	66 min
Jun 25, 5:38 PM EDT	Severe Thunderstorm Warning	ILM	54 min
Jun 25, 6:23 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 25, 6:47 PM EDT	Special Weather Statement	ILM	28 min
Jun 29, 3:18 PM EDT	Severe Thunderstorm Warning	ILM	19 min
Jun 29, 3:27 PM EDT	Special Weather Statement	ILM	48 min
Jul 6, 7:49 PM EDT	Special Weather Statement	ILM	41 min
Jul 7, 8:07 PM EDT	Beach Hazards Statement	ILM	25 hr
Jul 8, 7:49 PM EDT	Beach Hazards Statement	ILM	25 hr
Jul 10, 2:39 PM EDT	Coastal Flood Advisory	ILM	7 hr
Jul 12, 3:29 PM EDT	Special Weather Statement	ILM	31 min
Jul 12, 3:41 PM EDT	Severe Thunderstorm Warning	ILM	34 min
Jul 12, 3:57 PM EDT	Flash Flood Warning	ILM	42 min
Jul 12, 4:13 PM EDT	Severe Thunderstorm Warning	ILM	31 min
Jul 14, 12:52 PM EDT	Coastal Flood Advisory	ILM	12 hr
Jul 17, 4:45 AM EDT	Beach Hazards Statement	ILM	15 hr
Jul 17, 7:02 PM EDT	Special Weather Statement	ILM	43 min
Jul 20, 2:54 AM EDT	Flash Flood Watch	ILM	23 hr
Jul 21, 5:22 AM EDT	Beach Hazards Statement	ILM	15 hr
Jul 21, 7:50 PM EDT	Beach Hazards Statement	ILM	24 hr
Jul 22, 3:35 AM EDT	Mesoscale Discussion	SPC	2 hr
Jul 22, 5:21 PM EDT	Areal Flood Advisory	ILM	114 min
Jul 22, 7:52 PM EDT	Beach Hazards Statement	ILM	24 hr
Jul 23, 4:47 AM EDT	Special Weather Statement	ILM	28 min
Jul 23, 5:27 AM EDT	Special Weather Statement	ILM	33 min
Jul 23, 1:24 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 23, 3:36 PM EDT	Flash Flood Watch	ILM	52 hr
Jul 23, 8:09 PM EDT	Beach Hazards Statement	ILM	24 hr
Jul 23, 8:09 PM EDT	Rip Current Statement	ILM	24 hr
Jul 24, 3:32 AM EDT	Special Weather Statement	ILM	28 min
Jul 24, 7:51 PM EDT	Beach Hazards Statement	ILM	25 hr
Jul 24, 7:51 PM EDT	Rip Current Statement	ILM	25 hr
Jul 25, 7:34 PM EDT	Rip Current Statement	ILM	24 hr
Jul 28, 7:57 PM EDT	Severe Thunderstorm Warning	ILM	27 min
Jul 29, 10:24 PM EDT	Special Weather Statement	ILM	51 min
Jul 30, 3:34 PM EDT	Flash Flood Watch	ILM	20 hr
Jul 30, 5:03 PM EDT	Tornado Warning	ILM	27 min
Jul 30, 7:47 PM EDT	Beach Hazards Statement	ILM	24 hr
Jul 31, 8:03 PM EDT	Beach Hazards Statement	ILM	24 hr
Aug 1, 1:01 PM EDT	Special Weather Statement	ILM	44 min
Aug 1, 8:02 PM EDT	Beach Hazards Statement	ILM	24 hr
Aug 2, 11:29 AM EDT	Areal Flood Advisory	ILM	61 min
Aug 2, 12:14 PM EDT	Areal Flood Advisory	ILM	61 min
Aug 3, 6:10 AM EDT	Areal Flood Advisory	ILM	3 hr
Aug 5, 8:47 PM EDT	Special Weather Statement	ILM	43 min
Aug 7, 7:42 PM EDT	Beach Hazards Statement	ILM	24 hr
Aug 8, 4:13 AM EDT	Heat Advisory	ILM	15 hr
Aug 8, 10:21 PM EDT	Special Weather Statement	ILM	54 min
Aug 9, 4:06 PM EDT	Beach Hazards Statement	ILM	4 hr
Aug 9, 4:06 PM EDT	Beach Hazards Statement	ILM	28 hr
Aug 10, 8:03 PM EDT	Beach Hazards Statement	ILM	24 hr
Aug 11, 7:41 PM EDT	Beach Hazards Statement	ILM	24 hr
Aug 12, 7:27 PM EDT	Beach Hazards Statement	ILM	26 hr
Aug 14, 4:17 PM EDT	Special Weather Statement	ILM	58 min
Aug 18, 5:01 AM EDT	Beach Hazards Statement	ILM	15 hr
Aug 18, 7:43 PM EDT	Beach Hazards Statement	ILM	25 hr
Aug 23, 7:35 PM EDT	Beach Hazards Statement	ILM	24 hr
Aug 27, 6:54 AM EDT	Dense Fog Advisory	ILM	2 hr
Sep 8, 3:23 PM EDT	Rip Current Statement	ILM	29 hr
Sep 9, 7:55 PM EDT	Rip Current Statement	ILM	24 hr
Sep 10, 7:49 PM EDT	Rip Current Statement	ILM	24 hr
Sep 11, 6:49 AM EDT	Hurricane Watch	ILM	46 hr
Sep 11, 7:44 AM EDT	Storm Surge Watch	ILM	9 hr
Sep 11, 5:04 PM EDT	Hurricane Warning	ILM	3 days
Sep 11, 5:04 PM EDT	Storm Surge Warning	ILM	4 days
Sep 11, 7:51 PM EDT	Rip Current Statement	ILM	6 days
Sep 12, 4:50 AM EDT	Flash Flood Watch	ILM	5 days
Sep 12, 5:02 PM EDT	Tropical Storm Warning	ILM	3 days
Sep 13, 11:42 PM EDT	River Flood Warning	ILM	23 days
Sep 13, 11:42 PM EDT	River Flood Warning	ILM	31 days
Sep 14, 8:41 AM EDT	Flash Flood Warning	ILM	12 hr
Sep 14, 8:28 PM EDT	Flash Flood Warning	ILM	6 hr
Sep 16, 5:23 AM EDT	Flash Flood Warning	ILM	8 hr
Sep 16, 6:32 AM EDT	Mesoscale Discussion	SPC	88 min
Sep 16, 6:37 AM EDT	Areal Flood Advisory	ILM	3 hr
Sep 16, 6:55 AM EDT	Tornado Watch	SPC	16 hr
Sep 16, 10:25 AM EDT	Special Weather Statement	ILM	20 min
Sep 16, 11:16 AM EDT	Areal Flood Advisory	ILM	5 hr
Sep 16, 11:22 AM EDT	Mesoscale Discussion	SPC	113 min
Sep 16, 11:28 AM EDT	Flash Flood Warning	ILM	5 hr
Sep 16, 11:50 AM EDT	Tornado Warning Tornado observed	ILM	25 min
Sep 16, 12:13 PM EDT	Tornado Warning	ILM	32 min
Sep 16, 12:14 PM EDT	Tornado Warning	ILM	31 min
Sep 16, 12:41 PM EDT	Tornado Warning Considerable damage threat	ILM	24 min
Sep 16, 3:42 PM EDT	Mesoscale Discussion	SPC	93 min
Sep 16, 4:00 PM EDT	Flash Flood Warning	ILM	8 hr
Sep 16, 7:46 PM EDT	Flash Flood Warning	ILM	4 hr
Sep 16, 8:23 PM EDT	Special Weather Statement	ILM	67 min
Sep 16, 8:55 PM EDT	Mesoscale Discussion	SPC	2 hr
Sep 16, 9:31 PM EDT	Special Weather Statement	ILM	59 min
Sep 16, 9:53 PM EDT	Flash Flood Warning	ILM	2 hr
Sep 16, 10:18 PM EDT	Tornado Warning	ILM	42 min
Sep 16, 10:29 PM EDT	Tornado Warning	ILM	31 min
Sep 16, 11:01 PM EDT	Tornado Watch	SPC	6 hr
Sep 17, 12:03 AM EDT	Flash Flood Warning	ILM	3 hr
Sep 17, 12:22 AM EDT	Tornado Warning	ILM	23 min
Sep 17, 1:02 AM EDT	Tornado Warning	ILM	28 min
Sep 17, 4:11 AM EDT	Mesoscale Discussion	SPC	2 hr
Sep 17, 5:29 AM EDT	Flash Flood Warning	ILM	5 hr
Sep 17, 10:25 AM EDT	Areal Flood Warning	ILM	72 hr
Sep 18, 5:01 AM EDT	Beach Hazards Statement	ILM	15 hr
Sep 20, 10:33 AM EDT	Areal Flood Warning	ILM	43 hr
Sep 23, 10:30 AM EDT	Areal Flood Warning	ILM	6 days
Sep 29, 3:31 PM EDT	Areal Flood Advisory	ILM	65 min
Oct 6, 5:27 PM EDT	Special Weather Statement	ILM	33 min
Oct 8, 7:58 PM EDT	Rip Current Statement	ILM	24 hr
Oct 9, 4:55 PM EDT	Flash Flood Watch	ILM	44 hr
Oct 9, 5:02 PM EDT	Tropical Storm Watch	ILM	12 hr
Oct 9, 10:02 PM EDT	Coastal Flood Advisory	ILM	40 hr
Oct 9, 10:02 PM EDT	Rip Current Statement	ILM	46 hr
Oct 10, 4:54 AM EDT	Tropical Storm Warning	ILM	42 hr
Oct 10, 12:18 PM EDT	Areal Flood Advisory	ILM	49 min
Oct 10, 1:04 PM EDT	High Surf Advisory	ILM	31 hr
Oct 10, 4:50 PM EDT	Mesoscale Discussion	SPC	2 hr
Oct 10, 7:40 PM EDT	Beach Hazards Statement	ILM	24 hr
Oct 10, 11:38 PM EDT	Tornado Watch	SPC	7 hr
Oct 11, 4:34 AM EDT	Mesoscale Discussion	SPC	56 min
Oct 16, 4:58 PM EDT	Special Weather Statement	ILM	62 min
Oct 16, 6:28 PM EDT	Mesoscale Discussion	SPC	3 hr
Oct 20, 7:45 PM EDT	Beach Hazards Statement	ILM	24 hr
Oct 26, 3:18 AM EDT	Coastal Flood Advisory	ILM	9 hr
Oct 26, 3:33 PM EDT	Special Weather Statement	ILM	57 min
Nov 9, 3:15 PM EST	Freeze Watch	ILM	18 hr
Nov 10, 9:14 AM EST	Freeze Warning	ILM	24 hr
Nov 13, 12:16 AM EST	Mesoscale Discussion	SPC	2 hr
Nov 13, 3:46 AM EST	Mesoscale Discussion	SPC	59 min
Nov 17, 9:15 AM EST	River Flood Warning	ILM	15 days
Nov 21, 10:55 AM EST	Coastal Flood Advisory	ILM	49 hr
Nov 24, 4:08 AM EST	Coastal Flood Warning	ILM	8 hr
Nov 24, 7:37 PM EST	River Flood Warning	ILM	4 days
Nov 26, 3:38 AM EST	Freeze Watch	ILM	24 hr
Nov 27, 3:58 AM EST	Freeze Warning	ILM	29 hr
Nov 28, 12:25 PM EST	Freeze Warning	ILM	20 hr
Dec 8, 3:30 PM EST	Wind Advisory	ILM	27 hr
Dec 9, 5:27 AM EST	Coastal Flood Advisory	ILM	6 hr
Dec 9, 9:43 AM EST	River Flood Warning	ILM	37 days
Dec 13, 3:55 AM EST	Flash Flood Watch	ILM	53 hr
Dec 14, 11:57 AM EST	Areal Flood Advisory	ILM	3 hr
Dec 14, 2:20 PM EST	Areal Flood Advisory	ILM	3 hr
Dec 14, 5:13 PM EST	Areal Flood Advisory	ILM	3 hr
Dec 14, 8:12 PM EST	Areal Flood Advisory	ILM	3 hr
Dec 14, 9:28 PM EST	River Flood Warning	ILM	29 days
Dec 14, 11:16 PM EST	Areal Flood Advisory	ILM	3 hr
Dec 20, 3:18 AM EST	Flash Flood Watch	ILM	18 hr
Dec 20, 4:12 PM EST	Mesoscale Discussion	SPC	3 hr
Dec 21, 3:04 AM EST	Wind Advisory	ILM	15 hr
Dec 21, 2:14 PM EST	Special Weather Statement	ILM	61 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	16
Tornado Warning	9
Severe Thunderstorm Watch	1
Tornado Watch	4
Mesoscale Discussion	19
Special Weather Statement	36
Flooding
Areal Flood Warning	3
Flash Flood Warning	11
River Flood Warning	6
Flash Flood Watch	9
Areal Flood Advisory	16
Winter
Winter Storm Warning	1
Winter Storm Watch	1
Heat
Heat Advisory	5
Cold
Freeze Warning	7
Freeze Watch	3
Wind Chill Advisory	4
Wind and dust
Wind Advisory	5
Fire
Red Flag Warning	2
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	6
Tropical
Hurricane Warning	1
Storm Surge Warning	1
Tropical Storm Warning	2
Hurricane Watch	1
Storm Surge Watch	1
Tropical Storm Watch	1
Coast and beach
Coastal Flood Warning	1
Coastal Flood Advisory	8
High Surf Advisory	1
Beach Hazards Statement	30
Rip Current Statement	14

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2017 2019

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.