Alert archive / South Carolina / Horry County
Weather alerts in Horry County, South Carolina, 2017
184 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 184
- Warnings
- 41
- Watches
- 12
- Advisories
- 45
- Busiest month
- August33 alerts
- Busiest day
- May 5, 20177 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
1 of 7 tornado warnings covering Horry County in 2017 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 7 minutes after it went out.
Horry County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 7 | 1 | 86% | 1 | 100% | 7 min |
| Severe thunderstorm warnings | 25 | 15 | 40% | 16 | 44% | 9 min |
| Flash flood warnings | 2 | 1 | 50% | 2 | 100% | 47 min |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Wilmington, NC: tornado warnings | 19 | 1 | 95% | 6 | 17% | 7 min |
| NWS Wilmington, NC: severe thunderstorm warnings | 87 | 49 | 44% | 121 | 65% | 18 min |
| NWS Wilmington, NC: flash flood warnings | 9 | 3 | 67% | 8 | 88% | 49 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, 5:46 PM EST | Dense Fog Advisory | ILM | 12 hr |
| Feb 9, 3:12 AM EST | Mesoscale Discussion | SPC | 2 hr |
| Feb 9, 5:45 AM EST | Special Weather Statement | ILM | 60 min |
| Feb 9, 6:43 AM EST | Special Weather Statement | ILM | 62 min |
| Feb 15, 10:19 AM EST | Mesoscale Discussion | SPC | 2 hr |
| Feb 15, 11:33 AM EST | Special Weather Statement | ILM | 57 min |
| Feb 25, 4:38 AM EST | Dense Fog Advisory | ILM | 4 hr |
| Mar 3, 3:29 AM EST | Freeze Watch | ILM | 9 hr |
| Mar 4, 3:06 PM EST | Frost Advisory | ILM | 17 hr |
| Mar 13, 9:22 AM EDT | Freeze Watch | ILM | 18 hr |
| Mar 14, 3:31 AM EDT | Freeze Warning | ILM | 31 hr |
| Mar 15, 11:17 AM EDT | Freeze Warning | ILM | 23 hr |
| Mar 16, 10:04 AM EDT | Freeze Warning | ILM | 24 hr |
| Mar 18, 8:40 PM EDT | Special Weather Statement | ILM | 50 min |
| Mar 22, 12:11 AM EDT | Special Weather Statement | ILM | 64 min |
| Mar 31, 12:53 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 3, 4:00 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Apr 3, 4:36 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 3, 6:41 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Apr 3, 6:50 PM EDT | Severe Thunderstorm Warning | ILM | 55 min |
| Apr 3, 7:44 PM EDT | Severe Thunderstorm Warning | ILM | 33 min |
| Apr 5, 2:45 PM EDT | Tornado Watch | SPC | 5 hr |
| Apr 5, 2:59 PM EDT | Wind Advisory | ILM | 31 hr |
| Apr 5, 4:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Apr 5, 5:53 PM EDT | Tornado Warning | ILM | 42 min |
| Apr 5, 6:58 PM EDT | Special Weather Statement | ILM | 32 min |
| Apr 19, 6:17 PM EDT | Areal Flood Advisory | ILM | 118 min |
| Apr 20, 6:07 AM EDT | Dense Fog Advisory | ILM | 3 hr |
| Apr 21, 4:04 PM EDT | Beach Hazards Statement | ILM | 28 hr |
| Apr 23, 4:02 AM EDT | Flash Flood Watch | ILM | 48 hr |
| Apr 24, 7:53 AM EDT | Areal Flood Advisory | ILM | 112 min |
| Apr 27, 1:00 PM EDT | Coastal Flood Advisory | ILM | 12 hr |
| Apr 30, 3:02 PM EDT | Beach Hazards Statement | ILM | 29 hr |
| May 4, 8:49 PM EDT | Tornado Watch | SPC | 6 hr |
| May 4, 11:09 PM EDT | Special Weather Statement | ILM | 51 min |
| May 4, 11:24 PM EDT | Mesoscale Discussion | SPC | 66 min |
| May 4, 11:41 PM EDT | Tornado Warning | ILM | 34 min |
| May 5, 3:09 AM EDT | Tornado Watch | SPC | 6 hr |
| May 5, 4:04 AM EDT | Severe Thunderstorm Warning | ILM | 26 min |
| May 5, 5:25 AM EDT | Beach Hazards Statement | ILM | 15 hr |
| May 22, 3:57 PM EDT | Beach Hazards Statement | ILM | 3 days |
| May 22, 4:13 PM EDT | Special Weather Statement | ILM | 62 min |
| May 22, 5:26 PM EDT | Areal Flood Advisory | ILM | 64 min |
| May 22, 6:13 PM EDT | Flash Flood Warning | ILM | 3 hr |
| May 22, 6:32 PM EDT | Areal Flood Advisory | ILM | 118 min |
| May 23, 3:19 AM EDT | Flash Flood Watch | ILM | 38 hr |
| May 23, 3:03 PM EDT | Special Weather Statement | ILM | 42 min |
| May 23, 4:50 PM EDT | Mesoscale Discussion | SPC | 85 min |
| May 24, 3:13 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 25, 1:43 PM EDT | Special Weather Statement | ILM | 62 min |
| May 25, 2:16 PM EDT | Severe Thunderstorm Warning | ILM | 44 min |
| May 25, 9:14 PM EDT | Beach Hazards Statement | ILM | 24 hr |
| May 28, 4:56 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 28, 6:36 PM EDT | Severe Thunderstorm Warning | ILM | 54 min |
| May 28, 7:06 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 28, 8:20 PM EDT | Mesoscale Discussion | SPC | 85 min |
| May 28, 8:34 PM EDT | Special Weather Statement | ILM | 56 min |
| May 28, 8:40 PM EDT | Severe Thunderstorm Warning | ILM | 41 min |
| May 28, 9:08 PM EDT | Special Weather Statement | ILM | 52 min |
| May 29, 9:59 PM EDT | Severe Thunderstorm Warning | ILM | 61 min |
| May 29, 10:28 PM EDT | Severe Thunderstorm Warning | ILM | 32 min |
| May 29, 10:59 PM EDT | Special Weather Statement | ILM | 46 min |
| May 29, 11:41 PM EDT | Special Weather Statement | ILM | 34 min |
| May 30, 3:51 AM EDT | Special Weather Statement | ILM | 24 min |
| Jun 3, 4:24 PM EDT | Special Weather Statement | ILM | 66 min |
| Jun 3, 4:28 PM EDT | Severe Thunderstorm Warning | ILM | 11 min |
| Jun 3, 6:20 PM EDT | Severe Thunderstorm Warning | ILM | 34 min |
| Jun 7, 4:12 PM EDT | Beach Hazards Statement | ILM | 28 hr |
| Jun 14, 1:17 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 16, 1:27 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 19, 5:31 AM EDT | Beach Hazards Statement | ILM | 15 hr |
| Jun 23, 4:32 AM EDT | Beach Hazards Statement | ILM | 39 hr |
| Jun 24, 7:29 PM EDT | Special Weather Statement | ILM | 46 min |
| Jul 5, 4:01 PM EDT | Special Weather Statement | ILM | 59 min |
| Jul 5, 6:09 PM EDT | Severe Thunderstorm Warning | ILM | 38 min |
| Jul 5, 6:39 PM EDT | Special Weather Statement | ILM | 66 min |
| Jul 5, 6:46 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 7, 10:37 AM EDT | Heat Advisory | ILM | 8 hr |
| Jul 7, 8:00 PM EDT | Special Weather Statement | ILM | 15 min |
| Jul 7, 8:22 PM EDT | Severe Thunderstorm Warning | ILM | 25 min |
| Jul 7, 11:12 PM EDT | Special Weather Statement | ILM | 33 min |
| Jul 7, 11:19 PM EDT | Severe Thunderstorm Warning | ILM | 26 min |
| Jul 9, 7:01 PM EDT | Areal Flood Advisory | ILM | 119 min |
| Jul 9, 7:05 PM EDT | Areal Flood Advisory | ILM | 115 min |
| Jul 9, 7:11 PM EDT | Flash Flood Warning | ILM | 3 hr |
| Jul 9, 7:46 PM EDT | Areal Flood Advisory | ILM | 3 hr |
| Jul 9, 7:51 PM EDT | Special Weather Statement | ILM | 54 min |
| Jul 11, 4:46 PM EDT | Special Weather Statement | ILM | 59 min |
| Jul 11, 5:44 PM EDT | Areal Flood Advisory | ILM | 3 hr |
| Jul 11, 7:54 PM EDT | Areal Flood Advisory | ILM | 66 min |
| Jul 15, 11:40 AM EDT | Heat Advisory | ILM | 7 hr |
| Jul 15, 6:16 PM EDT | Special Weather Statement | ILM | 59 min |
| Jul 15, 7:01 PM EDT | Severe Thunderstorm Warning | ILM | 30 min |
| Jul 15, 8:26 PM EDT | Areal Flood Advisory | ILM | 3 hr |
| Jul 18, 8:25 AM EDT | Areal Flood Advisory | ILM | 5 days |
| Jul 22, 3:46 AM EDT | Heat Advisory | ILM | 15 hr |
| Jul 22, 3:00 PM EDT | Heat Advisory | ILM | 28 hr |
| Jul 23, 5:24 PM EDT | Special Weather Statement | ILM | 66 min |
| Jul 23, 5:33 PM EDT | Severe Thunderstorm Warning | ILM | 25 min |
| Jul 24, 11:24 AM EDT | Beach Hazards Statement | ILM | 9 hr |
| Jul 24, 6:54 PM EDT | Special Weather Statement | ILM | 66 min |
| Jul 24, 7:20 PM EDT | Areal Flood Advisory | ILM | 85 min |
| Jul 24, 7:31 PM EDT | Special Weather Statement | ILM | 29 min |
| Jul 24, 8:07 PM EDT | Special Weather Statement | ILM | 23 min |
| Jul 29, 4:03 AM EDT | Special Weather Statement | ILM | 57 min |
| Aug 6, 8:30 PM EDT | Severe Thunderstorm Warning | ILM | 15 min |
| Aug 7, 2:23 PM EDT | Special Weather Statement | ILM | 37 min |
| Aug 7, 3:48 PM EDT | Severe Thunderstorm Warning | ILM | 42 min |
| Aug 7, 4:22 PM EDT | Severe Thunderstorm Warning | ILM | 38 min |
| Aug 8, 5:20 AM EDT | Beach Hazards Statement | ILM | 16 hr |
| Aug 8, 2:31 PM EDT | Areal Flood Advisory | ILM | 119 min |
| Aug 12, 4:13 AM EDT | Special Weather Statement | ILM | 77 min |
| Aug 14, 3:13 PM EDT | Rip Current Statement | ILM | 29 hr |
| Aug 16, 10:07 AM EDT | Heat Advisory | ILM | 7 hr |
| Aug 16, 6:28 PM EDT | Special Weather Statement | ILM | 62 min |
| Aug 17, 3:21 AM EDT | Heat Advisory | ILM | 14 hr |
| Aug 17, 4:48 PM EDT | Severe Thunderstorm Warning | ILM | 20 min |
| Aug 18, 3:21 AM EDT | Heat Advisory | ILM | 15 hr |
| Aug 19, 3:22 AM EDT | Heat Advisory | ILM | 15 hr |
| Aug 19, 3:52 PM EDT | Special Weather Statement | ILM | 23 min |
| Aug 19, 4:12 PM EDT | Areal Flood Advisory | ILM | 93 min |
| Aug 23, 1:23 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 23, 7:10 PM EDT | Severe Thunderstorm Warning | ILM | 95 min |
| Aug 23, 9:17 PM EDT | Severe Thunderstorm Warning | ILM | 22 min |
| Aug 23, 9:44 PM EDT | Special Weather Statement | ILM | 46 min |
| Aug 23, 11:00 PM EDT | Special Weather Statement | ILM | 45 min |
| Aug 23, 11:07 PM EDT | Areal Flood Advisory | ILM | 3 hr |
| Aug 23, 11:52 PM EDT | Special Weather Statement | ILM | 38 min |
| Aug 23, 11:59 PM EDT | Areal Flood Advisory | ILM | 2 hr |
| Aug 24, 12:34 AM EDT | Areal Flood Advisory | ILM | 86 min |
| Aug 26, 4:00 PM EDT | Beach Hazards Statement | ILM | 25 hr |
| Aug 27, 4:59 PM EDT | Tropical Storm Watch | ILM | 39 hr |
| Aug 28, 3:19 AM EDT | Flash Flood Watch | ILM | 24 hr |
| Aug 28, 9:58 AM EDT | River Flood Warning | ILM | 25 hr |
| Aug 31, 4:27 PM EDT | Special Weather Statement | ILM | 48 min |
| Aug 31, 5:17 PM EDT | Special Weather Statement | ILM | 43 min |
| Aug 31, 7:25 PM EDT | Special Weather Statement | ILM | 65 min |
| Aug 31, 7:47 PM EDT | Tornado Warning | ILM | 28 min |
| Aug 31, 8:09 PM EDT | Tornado Warning | ILM | 36 min |
| Aug 31, 8:44 PM EDT | Special Weather Statement | ILM | 61 min |
| Sep 1, 9:45 AM EDT | River Flood Warning | ILM | 6 days |
| Sep 1, 3:06 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 2, 5:24 AM EDT | Special Weather Statement | ILM | 36 min |
| Sep 2, 5:25 AM EDT | Special Weather Statement | ILM | 35 min |
| Sep 5, 4:43 PM EDT | Rip Current Statement | ILM | 27 hr |
| Sep 6, 4:08 AM EDT | Special Weather Statement | ILM | 37 min |
| Sep 6, 4:39 PM EDT | Special Weather Statement | ILM | 51 min |
| Sep 6, 5:36 PM EDT | Special Weather Statement | ILM | 39 min |
| Sep 6, 5:51 PM EDT | Tornado Warning | ILM | 24 min |
| Sep 6, 5:57 PM EDT | Severe Thunderstorm Warning | ILM | 31 min |
| Sep 7, 4:39 PM EDT | Rip Current Statement | ILM | 5 days |
| Sep 10, 3:44 AM EDT | Wind Advisory | ILM | 46 hr |
| Sep 10, 1:20 PM EDT | Coastal Flood Watch | ILM | 15 hr |
| Sep 10, 1:20 PM EDT | Coastal Flood Advisory | ILM | 27 hr |
| Sep 11, 3:15 PM EDT | Coastal Flood Advisory | ILM | 14 hr |
| Sep 11, 7:00 PM EDT | Coastal Flood Warning | ILM | 8 hr |
| Sep 11, 10:18 PM EDT | Tornado Warning | ILM | 27 min |
| Sep 11, 11:26 PM EDT | Severe Thunderstorm Warning | ILM | 34 min |
| Sep 12, 1:16 AM EDT | Areal Flood Advisory | ILM | 119 min |
| Sep 12, 3:00 AM EDT | Areal Flood Advisory | ILM | 3 hr |
| Sep 12, 3:13 AM EDT | River Flood Warning | ILM | 6 days |
| Sep 16, 8:06 PM EDT | Rip Current Statement | ILM | 49 hr |
| Sep 21, 3:00 PM EDT | Special Weather Statement | ILM | 60 min |
| Sep 21, 3:44 PM EDT | Areal Flood Advisory | ILM | 91 min |
| Sep 21, 4:14 PM EDT | Special Weather Statement | ILM | 31 min |
| Sep 21, 4:44 PM EDT | Special Weather Statement | ILM | 31 min |
| Sep 21, 4:50 PM EDT | Areal Flood Advisory | ILM | 85 min |
| Sep 22, 3:05 PM EDT | Rip Current Statement | ILM | 5 days |
| Sep 23, 2:11 PM EDT | High Surf Advisory | ILM | 50 hr |
| Sep 29, 3:10 PM EDT | Beach Hazards Statement | ILM | 53 hr |
| Oct 10, 1:05 PM EDT | Areal Flood Advisory | ILM | 55 min |
| Oct 12, 10:28 PM EDT | Areal Flood Advisory | ILM | 92 min |
| Oct 16, 4:46 PM EDT | Beach Hazards Statement | ILM | 28 hr |
| Oct 18, 3:13 PM EDT | Rip Current Statement | ILM | 14 hr |
| Oct 23, 6:59 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Oct 23, 9:26 PM EDT | Severe Thunderstorm Warning | ILM | 49 min |
| Oct 23, 9:57 PM EDT | Severe Thunderstorm Warning | ILM | 38 min |
| Oct 23, 10:06 PM EDT | Special Weather Statement | ILM | 24 min |
| Oct 23, 10:20 PM EDT | Tornado Warning | ILM | 25 min |
| Oct 29, 5:24 AM EDT | Beach Hazards Statement | ILM | 15 hr |
| Nov 5, 2:47 AM EST | Coastal Flood Advisory | ILM | 7 hr |
| Nov 5, 11:13 PM EST | Dense Fog Advisory | ILM | 11 hr |
| Dec 28, 2:31 PM EST | Winter Weather Advisory | ILM | 18 hr |
| Dec 31, 5:50 PM EST | Winter Weather Advisory | ILM | 8 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 | 7 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 17 |
| Special Weather Statement | 49 |
| Flooding | |
| Flash Flood Warning | 2 |
| River Flood Warning | 3 |
| Flash Flood Watch | 3 |
| Areal Flood Advisory | 23 |
| Winter | |
| Winter Weather Advisory | 2 |
| Heat | |
| Heat Advisory | 8 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 2 |
| Frost Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
| Tropical | |
| Tropical Storm Watch | 1 |
| Coast and beach | |
| Coastal Flood Warning | 1 |
| Coastal Flood Watch | 1 |
| Coastal Flood Advisory | 4 |
| High Surf Advisory | 1 |
| Beach Hazards Statement | 14 |
| Rip Current Statement | 6 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.