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
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 13 | 8 | 38% | 8 | 100% | 24 min |
| Flash flood warnings | 1 | 1 | 0% | 2 | 50% | 27 min |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Wilmington, NC: tornado warnings | 12 | 2 | 83% | 5 | 80% | 1 min |
| NWS Wilmington, NC: severe thunderstorm warnings | 46 | 23 | 50% | 57 | 79% | 19 min |
| NWS Wilmington, NC: flash flood warnings | 8 | 5 | 38% | 7 | 86% | 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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Dec 31, 11:55 PM EST | Dense Fog Advisory | ILM | 10 hr |
| Jan 2, 8:29 PM EST | River Flood Warning | ILM | 13 days |
| Jan 6, 9:01 PM EST | River Flood Warning | ILM | 21 days |
| Jan 12, 11:13 PM EST | Dense Fog Advisory | ILM | 10 hr |
| Jan 16, 12:29 AM EST | Dense Fog Advisory | ILM | 6 hr |
| Jan 25, 7:15 PM EST | Dense Fog Advisory | ILM | 13 hr |
| Feb 3, 8:45 AM EST | River Flood Warning | ILM | 32 days |
| Feb 11, 5:40 AM EST | Dense Fog Advisory | ILM | 3 hr |
| Feb 13, 9:15 PM EST | River Flood Warning | ILM | 28 days |
| Feb 14, 8:58 PM EST | River Flood Warning | ILM | 21 days |
| Feb 15, 11:33 PM EST | Severe Thunderstorm Warning | ILM | 17 min |
| Feb 18, 3:16 AM EST | Flash Flood Watch | ILM | 28 hr |
| Feb 18, 11:00 AM EST | Areal Flood Advisory | ILM | 2 hr |
| Feb 18, 5:11 PM EST | Areal Flood Advisory | ILM | 3 hr |
| Feb 19, 12:28 AM EST | Areal Flood Advisory | ILM | 109 min |
| Feb 22, 11:27 PM EST | Dense Fog Advisory | ILM | 7 hr |
| Feb 27, 7:01 AM EST | Dense Fog Advisory | ILM | 116 min |
| Mar 1, 10:56 AM EST | Special Weather Statement | ILM | 64 min |
| Mar 1, 12:01 PM EST | Special Weather Statement | ILM | 59 min |
| Mar 26, 1:56 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Mar 28, 5:03 PM EDT | Special Weather Statement | ILM | 42 min |
| Mar 28, 6:08 PM EDT | Special Weather Statement | ILM | 37 min |
| Mar 31, 2:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Mar 31, 2:24 PM EDT | Special Weather Statement | ILM | 66 min |
| Mar 31, 3:44 PM EDT | Freeze Watch | ILM | 23 hr |
| Mar 31, 6:14 PM EDT | Special Weather Statement | ILM | 31 min |
| Mar 31, 6:24 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 31, 6:25 PM EDT | Severe Thunderstorm Warning | ILM | 35 min |
| Apr 1, 2:45 PM EDT | Freeze Warning | ILM | 17 hr |
| Apr 2, 8:21 AM EDT | Freeze Warning | ILM | 25 hr |
| Apr 20, 8:05 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| Apr 21, 3:17 AM EDT | Red Flag Warning | ILM | 16 hr |
| Apr 23, 8:02 PM EDT | Rip Current Statement | ILM | 24 hr |
| Apr 28, 7:36 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| May 2, 7:47 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| May 3, 5:50 PM EDT | Severe Thunderstorm Warning | ILM | 40 min |
| May 3, 6:13 PM EDT | Severe Thunderstorm Warning | ILM | 32 min |
| May 3, 6:26 PM EDT | Severe Thunderstorm Warning | ILM | 49 min |
| May 3, 6:43 PM EDT | Severe Thunderstorm Warning | ILM | 32 min |
| May 3, 7:59 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| May 4, 4:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| May 4, 8:02 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| May 4, 8:41 PM EDT | Special Weather Statement | ILM | 34 min |
| May 7, 3:30 PM EDT | Fire Weather Watch | ILM | 15 hr |
| May 9, 7:42 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| May 11, 7:37 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| May 12, 7:37 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| May 13, 7:55 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| May 27, 8:10 PM EDT | Beach Hazards Statement | ILM | 48 hr |
| May 29, 12:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 2, 4:19 PM EDT | Areal Flood Advisory | ILM | 73 min |
| Jun 2, 5:30 PM EDT | Areal Flood Advisory | ILM | 3 hr |
| Jun 3, 6:40 PM EDT | Special Weather Statement | ILM | 35 min |
| Jun 4, 3:17 PM EDT | Special Weather Statement | ILM | 43 min |
| Jun 4, 3:43 PM EDT | Special Weather Statement | ILM | 32 min |
| Jun 6, 9:09 AM EDT | Areal Flood Advisory | ILM | 111 min |
| Jun 6, 10:06 AM EDT | Areal Flood Advisory | ILM | 3 hr |
| Jun 9, 8:03 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| Jun 10, 7:37 PM EDT | Severe Thunderstorm Warning | ILM | 23 min |
| Jun 10, 7:58 PM EDT | Severe Thunderstorm Warning | ILM | 32 min |
| Jun 10, 8:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 12:57 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Jun 15, 1:58 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 15, 3:12 PM EDT | Severe Thunderstorm Warning | ILM | 48 min |
| Jun 15, 3:54 PM EDT | Severe Thunderstorm Warning | ILM | 36 min |
| Jun 15, 4:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 18, 8:00 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| Jun 19, 11:08 AM EDT | Tropical Storm Watch | ILM | 42 hr |
| Jun 19, 4:58 PM EDT | Severe Thunderstorm Warning | ILM | 11 min |
| Jun 19, 7:59 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| Jun 20, 3:35 AM EDT | Flash Flood Watch | ILM | 19 hr |
| Jun 20, 7:16 PM EDT | Special Weather Statement | ILM | 44 min |
| Jun 20, 7:55 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| Jun 20, 8:13 PM EDT | Special Weather Statement | ILM | 62 min |
| Jun 21, 8:06 PM EDT | Rip Current Statement | ILM | 24 hr |
| Jun 24, 4:45 AM EDT | Beach Hazards Statement | ILM | 15 hr |
| Jun 24, 1:01 PM EDT | Coastal Flood Advisory | ILM | 11 hr |
| Jun 26, 9:20 AM EDT | Areal Flood Advisory | ILM | 85 min |
| Jun 26, 7:55 PM EDT | Rip Current Statement | ILM | 24 hr |
| Jun 27, 7:25 PM EDT | Rip Current Statement | ILM | 25 hr |
| Jul 1, 4:54 AM EDT | Beach Hazards Statement | ILM | 15 hr |
| Jul 1, 4:35 PM EDT | Special Weather Statement | ILM | 55 min |
| Jul 1, 8:04 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| Jul 6, 8:37 PM EDT | Rip Current Statement | ILM | 47 hr |
| Jul 6, 11:16 PM EDT | Tropical Storm Warning | ILM | 45 hr |
| Jul 7, 7:08 PM EDT | Beach Hazards Statement | ILM | 25 hr |
| Jul 8, 1:38 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 2:01 AM EDT | Tornado Watch | SPC | 7 hr |
| Jul 8, 5:25 AM EDT | Tornado Warning | ILM | 22 min |
| Jul 8, 5:25 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 6:27 AM EDT | Areal Flood Advisory | ILM | 2 hr |
| Jul 8, 7:09 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 7:46 AM EDT | Tornado Warning | ILM | 29 min |
| Jul 8, 8:27 AM EDT | Areal Flood Advisory | ILM | 2 hr |
| Jul 9, 5:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 10, 8:10 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| Jul 11, 12:19 PM EDT | Special Weather Statement | ILM | 26 min |
| Jul 15, 3:18 PM EDT | Special Weather Statement | ILM | 57 min |
| Jul 18, 3:05 PM EDT | Special Weather Statement | ILM | 55 min |
| Jul 18, 3:28 PM EDT | Special Weather Statement | ILM | 17 min |
| Jul 18, 4:56 PM EDT | Severe Thunderstorm Warning | ILM | 34 min |
| Jul 19, 11:55 AM EDT | Flash Flood Watch | ILM | 10 hr |
| Jul 23, 3:21 PM EDT | Coastal Flood Advisory | ILM | 9 hr |
| Jul 24, 2:51 PM EDT | Coastal Flood Advisory | ILM | 8 hr |
| Jul 28, 6:07 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 28, 9:50 PM EDT | Special Weather Statement | ILM | 55 min |
| Jul 29, 3:16 PM EDT | Heat Advisory | ILM | 28 hr |
| Jul 29, 7:55 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| Jul 31, 3:13 AM EDT | Heat Advisory | ILM | 16 hr |
| Jul 31, 1:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 8:26 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| Aug 1, 3:47 AM EDT | Heat Advisory | ILM | 15 hr |
| Aug 1, 12:37 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 1, 4:59 PM EDT | Severe Thunderstorm Warning | ILM | 46 min |
| Aug 1, 5:50 PM EDT | Special Weather Statement | ILM | 25 min |
| Aug 1, 9:33 PM EDT | Areal Flood Advisory | ILM | 87 min |
| Aug 3, 3:20 AM EDT | Flash Flood Watch | ILM | 4 min |
| Aug 3, 3:30 AM EDT | Flash Flood Watch | ILM | 24 hr |
| Aug 3, 12:01 PM EDT | Areal Flood Advisory | ILM | 103 min |
| Aug 3, 1:12 PM EDT | Flash Flood Warning | ILM | 2 hr |
| Aug 3, 4:04 PM EDT | Areal Flood Advisory | ILM | 86 min |
| Aug 3, 5:33 PM EDT | Areal Flood Advisory | ILM | 81 min |
| Aug 17, 12:20 PM EDT | Areal Flood Advisory | ILM | 3 hr |
| Aug 19, 7:49 PM EDT | Rip Current Statement | ILM | 48 hr |
| Aug 31, 7:33 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| Sep 3, 10:53 AM EDT | Beach Hazards Statement | ILM | 9 hr |
| Sep 7, 7:42 PM EDT | Rip Current Statement | ILM | 24 hr |
| Sep 8, 3:55 PM EDT | Special Weather Statement | ILM | 35 min |
| Sep 8, 8:09 PM EDT | Rip Current Statement | ILM | 48 hr |
| Sep 19, 2:52 AM EDT | Coastal Flood Advisory | ILM | 21 hr |
| Sep 21, 3:12 AM EDT | Flash Flood Watch | ILM | 39 hr |
| Sep 30, 4:42 PM EDT | Special Weather Statement | ILM | 33 min |
| Oct 1, 5:51 PM EDT | Rip Current Statement | ILM | 50 hr |
| Oct 7, 3:51 AM EDT | Coastal Flood Advisory | ILM | 6 hr |
| Oct 8, 3:36 AM EDT | Coastal Flood Advisory | ILM | 9 hr |
| Oct 8, 9:50 AM EDT | Coastal Flood Advisory | ILM | 70 min |
| Oct 9, 4:01 AM EDT | Coastal Flood Advisory | ILM | 10 hr |
| Oct 10, 3:32 AM EDT | Coastal Flood Advisory | ILM | 12 hr |
| Oct 28, 6:36 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 28, 8:17 PM EDT | Rip Current Statement | ILM | 24 hr |
| Oct 28, 11:28 PM EDT | Special Weather Statement | ILM | 62 min |
| Nov 3, 2:20 PM EDT | Coastal Flood Advisory | ILM | 22 hr |
| Nov 5, 3:19 AM EDT | Coastal Flood Advisory | ILM | 12 hr |
| Nov 5, 3:03 PM EDT | Coastal Flood Watch | ILM | 14 hr |
| Nov 5, 3:07 PM EDT | Coastal Flood Advisory | ILM | 7 hr |
| Nov 5, 9:45 PM EDT | Coastal Flood Advisory | ILM | 16 hr |
| Nov 6, 3:43 AM EDT | High Surf Advisory | ILM | 57 hr |
| Nov 6, 1:46 PM EDT | Coastal Flood Warning | ILM | 24 hr |
| Nov 6, 1:46 PM EDT | Coastal Flood Advisory | ILM | 12 hr |
| Nov 7, 9:40 PM EST | Coastal Flood Advisory | ILM | 17 hr |
| Nov 15, 2:10 PM EST | Frost Advisory | ILM | 18 hr |
| Nov 22, 4:18 AM EST | Freeze Watch | ILM | 22 hr |
| Nov 23, 2:18 AM EST | Freeze Warning | ILM | 31 hr |
| Dec 4, 4:53 AM EST | Coastal Flood Advisory | ILM | 6 hr |
| Dec 5, 1:24 AM EST | Coastal Flood Advisory | ILM | 10 hr |
| Dec 6, 2:11 AM EST | Dense Fog Advisory | ILM | 8 hr |
| Dec 6, 3:01 AM EST | Coastal Flood Advisory | ILM | 9 hr |
| Dec 8, 10:38 PM EST | Dense Fog Advisory | ILM | 10 hr |
| Dec 11, 8:47 PM EST | Special Weather Statement | ILM | 28 min |
| Dec 18, 3:21 AM EST | Dense Fog Advisory | ILM | 6 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.