Alert archive / South Carolina / Horry County

Weather alerts in Horry County, South Carolina, 2021

160 weather alerts in 2021, 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 2021. Tap one for its archive.

Alerts
160
Warnings
27
Watches
14
Advisories
48
Busiest month
June30 alerts
Busiest day
July 8, 20218 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 Horry County in 2021 had a tornado report inside them.

Horry County, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings20100%0
Severe thunderstorm warnings13838%8100%24 min
Flash flood warnings110%250%27 min

Each office's whole area, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Wilmington, NC: tornado warnings12283%580%1 min
NWS Wilmington, NC: severe thunderstorm warnings462350%5779%19 min
NWS Wilmington, NC: flash flood warnings8538%786%99 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.

IssuedProductOfficeLasted
Dec 31, 11:55 PM ESTDense Fog AdvisoryILM10 hr
Jan 2, 8:29 PM ESTRiver Flood WarningILM13 days
Jan 6, 9:01 PM ESTRiver Flood WarningILM21 days
Jan 12, 11:13 PM ESTDense Fog AdvisoryILM10 hr
Jan 16, 12:29 AM ESTDense Fog AdvisoryILM6 hr
Jan 25, 7:15 PM ESTDense Fog AdvisoryILM13 hr
Feb 3, 8:45 AM ESTRiver Flood WarningILM32 days
Feb 11, 5:40 AM ESTDense Fog AdvisoryILM3 hr
Feb 13, 9:15 PM ESTRiver Flood WarningILM28 days
Feb 14, 8:58 PM ESTRiver Flood WarningILM21 days
Feb 15, 11:33 PM ESTSevere Thunderstorm WarningILM17 min
Feb 18, 3:16 AM ESTFlash Flood WatchILM28 hr
Feb 18, 11:00 AM ESTAreal Flood AdvisoryILM2 hr
Feb 18, 5:11 PM ESTAreal Flood AdvisoryILM3 hr
Feb 19, 12:28 AM ESTAreal Flood AdvisoryILM109 min
Feb 22, 11:27 PM ESTDense Fog AdvisoryILM7 hr
Feb 27, 7:01 AM ESTDense Fog AdvisoryILM116 min
Mar 1, 10:56 AM ESTSpecial Weather StatementILM64 min
Mar 1, 12:01 PM ESTSpecial Weather StatementILM59 min
Mar 26, 1:56 PM EDTMesoscale DiscussionSPC94 min
Mar 28, 5:03 PM EDTSpecial Weather StatementILM42 min
Mar 28, 6:08 PM EDTSpecial Weather StatementILM37 min
Mar 31, 2:22 PM EDTMesoscale DiscussionSPC113 min
Mar 31, 2:24 PM EDTSpecial Weather StatementILM66 min
Mar 31, 3:44 PM EDTFreeze WatchILM23 hr
Mar 31, 6:14 PM EDTSpecial Weather StatementILM31 min
Mar 31, 6:24 PM EDTMesoscale DiscussionSPC2 hr
Mar 31, 6:25 PM EDTSevere Thunderstorm WarningILM35 min
Apr 1, 2:45 PM EDTFreeze WarningILM17 hr
Apr 2, 8:21 AM EDTFreeze WarningILM25 hr
Apr 20, 8:05 PM EDTBeach Hazards StatementILM24 hr
Apr 21, 3:17 AM EDTRed Flag WarningILM16 hr
Apr 23, 8:02 PM EDTRip Current StatementILM24 hr
Apr 28, 7:36 PM EDTBeach Hazards StatementILM24 hr
May 2, 7:47 PM EDTBeach Hazards StatementILM24 hr
May 3, 5:50 PM EDTSevere Thunderstorm WarningILM40 min
May 3, 6:13 PM EDTSevere Thunderstorm WarningILM32 min
May 3, 6:26 PM EDTSevere Thunderstorm WarningILM49 min
May 3, 6:43 PM EDTSevere Thunderstorm WarningILM32 min
May 3, 7:59 PM EDTBeach Hazards StatementILM24 hr
May 4, 4:16 PM EDTMesoscale DiscussionSPC119 min
May 4, 8:02 PM EDTBeach Hazards StatementILM24 hr
May 4, 8:41 PM EDTSpecial Weather StatementILM34 min
May 7, 3:30 PM EDTFire Weather WatchILM15 hr
May 9, 7:42 PM EDTBeach Hazards StatementILM24 hr
May 11, 7:37 PM EDTBeach Hazards StatementILM24 hr
May 12, 7:37 PM EDTBeach Hazards StatementILM24 hr
May 13, 7:55 PM EDTBeach Hazards StatementILM24 hr
May 27, 8:10 PM EDTBeach Hazards StatementILM48 hr
May 29, 12:37 PM EDTMesoscale DiscussionSPC113 min
Jun 2, 4:19 PM EDTAreal Flood AdvisoryILM73 min
Jun 2, 5:30 PM EDTAreal Flood AdvisoryILM3 hr
Jun 3, 6:40 PM EDTSpecial Weather StatementILM35 min
Jun 4, 3:17 PM EDTSpecial Weather StatementILM43 min
Jun 4, 3:43 PM EDTSpecial Weather StatementILM32 min
Jun 6, 9:09 AM EDTAreal Flood AdvisoryILM111 min
Jun 6, 10:06 AM EDTAreal Flood AdvisoryILM3 hr
Jun 9, 8:03 PM EDTBeach Hazards StatementILM24 hr
Jun 10, 7:37 PM EDTSevere Thunderstorm WarningILM23 min
Jun 10, 7:58 PM EDTSevere Thunderstorm WarningILM32 min
Jun 10, 8:11 PM EDTMesoscale DiscussionSPC2 hr
Jun 15, 12:57 PM EDTMesoscale DiscussionSPC63 min
Jun 15, 1:58 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 15, 3:12 PM EDTSevere Thunderstorm WarningILM48 min
Jun 15, 3:54 PM EDTSevere Thunderstorm WarningILM36 min
Jun 15, 4:09 PM EDTMesoscale DiscussionSPC96 min
Jun 18, 8:00 PM EDTBeach Hazards StatementILM24 hr
Jun 19, 11:08 AM EDTTropical Storm WatchILM42 hr
Jun 19, 4:58 PM EDTSevere Thunderstorm WarningILM11 min
Jun 19, 7:59 PM EDTBeach Hazards StatementILM24 hr
Jun 20, 3:35 AM EDTFlash Flood WatchILM19 hr
Jun 20, 7:16 PM EDTSpecial Weather StatementILM44 min
Jun 20, 7:55 PM EDTBeach Hazards StatementILM24 hr
Jun 20, 8:13 PM EDTSpecial Weather StatementILM62 min
Jun 21, 8:06 PM EDTRip Current StatementILM24 hr
Jun 24, 4:45 AM EDTBeach Hazards StatementILM15 hr
Jun 24, 1:01 PM EDTCoastal Flood AdvisoryILM11 hr
Jun 26, 9:20 AM EDTAreal Flood AdvisoryILM85 min
Jun 26, 7:55 PM EDTRip Current StatementILM24 hr
Jun 27, 7:25 PM EDTRip Current StatementILM25 hr
Jul 1, 4:54 AM EDTBeach Hazards StatementILM15 hr
Jul 1, 4:35 PM EDTSpecial Weather StatementILM55 min
Jul 1, 8:04 PM EDTBeach Hazards StatementILM24 hr
Jul 6, 8:37 PM EDTRip Current StatementILM47 hr
Jul 6, 11:16 PM EDTTropical Storm WarningILM45 hr
Jul 7, 7:08 PM EDTBeach Hazards StatementILM25 hr
Jul 8, 1:38 AM EDTMesoscale DiscussionSPC2 hr
Jul 8, 2:01 AM EDTTornado WatchSPC7 hr
Jul 8, 5:25 AM EDTTornado WarningILM22 min
Jul 8, 5:25 AM EDTMesoscale DiscussionSPC2 hr
Jul 8, 6:27 AM EDTAreal Flood AdvisoryILM2 hr
Jul 8, 7:09 AM EDTMesoscale DiscussionSPC2 hr
Jul 8, 7:46 AM EDTTornado WarningILM29 min
Jul 8, 8:27 AM EDTAreal Flood AdvisoryILM2 hr
Jul 9, 5:40 PM EDTMesoscale DiscussionSPC95 min
Jul 10, 8:10 PM EDTBeach Hazards StatementILM24 hr
Jul 11, 12:19 PM EDTSpecial Weather StatementILM26 min
Jul 15, 3:18 PM EDTSpecial Weather StatementILM57 min
Jul 18, 3:05 PM EDTSpecial Weather StatementILM55 min
Jul 18, 3:28 PM EDTSpecial Weather StatementILM17 min
Jul 18, 4:56 PM EDTSevere Thunderstorm WarningILM34 min
Jul 19, 11:55 AM EDTFlash Flood WatchILM10 hr
Jul 23, 3:21 PM EDTCoastal Flood AdvisoryILM9 hr
Jul 24, 2:51 PM EDTCoastal Flood AdvisoryILM8 hr
Jul 28, 6:07 PM EDTMesoscale DiscussionSPC83 min
Jul 28, 9:50 PM EDTSpecial Weather StatementILM55 min
Jul 29, 3:16 PM EDTHeat AdvisoryILM28 hr
Jul 29, 7:55 PM EDTBeach Hazards StatementILM24 hr
Jul 31, 3:13 AM EDTHeat AdvisoryILM16 hr
Jul 31, 1:40 PM EDTMesoscale DiscussionSPC2 hr
Jul 31, 8:26 PM EDTBeach Hazards StatementILM24 hr
Aug 1, 3:47 AM EDTHeat AdvisoryILM15 hr
Aug 1, 12:37 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 1, 4:59 PM EDTSevere Thunderstorm WarningILM46 min
Aug 1, 5:50 PM EDTSpecial Weather StatementILM25 min
Aug 1, 9:33 PM EDTAreal Flood AdvisoryILM87 min
Aug 3, 3:20 AM EDTFlash Flood WatchILM4 min
Aug 3, 3:30 AM EDTFlash Flood WatchILM24 hr
Aug 3, 12:01 PM EDTAreal Flood AdvisoryILM103 min
Aug 3, 1:12 PM EDTFlash Flood WarningILM2 hr
Aug 3, 4:04 PM EDTAreal Flood AdvisoryILM86 min
Aug 3, 5:33 PM EDTAreal Flood AdvisoryILM81 min
Aug 17, 12:20 PM EDTAreal Flood AdvisoryILM3 hr
Aug 19, 7:49 PM EDTRip Current StatementILM48 hr
Aug 31, 7:33 PM EDTBeach Hazards StatementILM24 hr
Sep 3, 10:53 AM EDTBeach Hazards StatementILM9 hr
Sep 7, 7:42 PM EDTRip Current StatementILM24 hr
Sep 8, 3:55 PM EDTSpecial Weather StatementILM35 min
Sep 8, 8:09 PM EDTRip Current StatementILM48 hr
Sep 19, 2:52 AM EDTCoastal Flood AdvisoryILM21 hr
Sep 21, 3:12 AM EDTFlash Flood WatchILM39 hr
Sep 30, 4:42 PM EDTSpecial Weather StatementILM33 min
Oct 1, 5:51 PM EDTRip Current StatementILM50 hr
Oct 7, 3:51 AM EDTCoastal Flood AdvisoryILM6 hr
Oct 8, 3:36 AM EDTCoastal Flood AdvisoryILM9 hr
Oct 8, 9:50 AM EDTCoastal Flood AdvisoryILM70 min
Oct 9, 4:01 AM EDTCoastal Flood AdvisoryILM10 hr
Oct 10, 3:32 AM EDTCoastal Flood AdvisoryILM12 hr
Oct 28, 6:36 PM EDTMesoscale DiscussionSPC3 hr
Oct 28, 8:17 PM EDTRip Current StatementILM24 hr
Oct 28, 11:28 PM EDTSpecial Weather StatementILM62 min
Nov 3, 2:20 PM EDTCoastal Flood AdvisoryILM22 hr
Nov 5, 3:19 AM EDTCoastal Flood AdvisoryILM12 hr
Nov 5, 3:03 PM EDTCoastal Flood WatchILM14 hr
Nov 5, 3:07 PM EDTCoastal Flood AdvisoryILM7 hr
Nov 5, 9:45 PM EDTCoastal Flood AdvisoryILM16 hr
Nov 6, 3:43 AM EDTHigh Surf AdvisoryILM57 hr
Nov 6, 1:46 PM EDTCoastal Flood WarningILM24 hr
Nov 6, 1:46 PM EDTCoastal Flood AdvisoryILM12 hr
Nov 7, 9:40 PM ESTCoastal Flood AdvisoryILM17 hr
Nov 15, 2:10 PM ESTFrost AdvisoryILM18 hr
Nov 22, 4:18 AM ESTFreeze WatchILM22 hr
Nov 23, 2:18 AM ESTFreeze WarningILM31 hr
Dec 4, 4:53 AM ESTCoastal Flood AdvisoryILM6 hr
Dec 5, 1:24 AM ESTCoastal Flood AdvisoryILM10 hr
Dec 6, 2:11 AM ESTDense Fog AdvisoryILM8 hr
Dec 6, 3:01 AM ESTCoastal Flood AdvisoryILM9 hr
Dec 8, 10:38 PM ESTDense Fog AdvisoryILM10 hr
Dec 11, 8:47 PM ESTSpecial Weather StatementILM28 min
Dec 18, 3:21 AM ESTDense Fog AdvisoryILM6 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordForecastThe radar archive20202022

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.