Alert archive / South Carolina / Williamsburg County
Weather alerts in Williamsburg County, South Carolina, 2016
155 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Williamsburg County and its neighbors
Each county as a circle sized by its count in 2016. Tap one for its archive.
- Alerts
- 155
- Warnings
- 42
- Watches
- 13
- Advisories
- 36
- Busiest month
- July57 alerts
- Busiest day
- July 9, 20168 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 3 tornado warnings covering Williamsburg County in 2016 had a tornado report inside them.
Williamsburg County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 25 | 19 | 24% | 9 | 78% | 24 min |
| Flash flood warnings | 2 | 2 | 0% | 1 | 100% | 257 min |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Wilmington, NC: tornado warnings | 20 | 0 | 100% | 1 | 0% | |
| NWS Wilmington, NC: severe thunderstorm warnings | 124 | 86 | 31% | 188 | 83% | 20 min |
| NWS Wilmington, NC: flash flood warnings | 20 | 16 | 20% | 56 | 95% | 172 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 22, 3:20 PM EST | Winter Weather Advisory | ILM | 21 hr |
| Feb 4, 11:39 AM EST | River Flood Warning | ILM | 7 days |
| Feb 15, 11:33 PM EST | Special Weather Statement | ILM | 27 min |
| Feb 16, 12:32 AM EST | Special Weather Statement | ILM | 28 min |
| Feb 16, 1:10 AM EST | Special Weather Statement | ILM | 35 min |
| Feb 16, 3:46 AM EST | Special Weather Statement | ILM | 29 min |
| Feb 16, 4:12 AM EST | Special Weather Statement | ILM | 33 min |
| Feb 23, 3:23 PM EST | Wind Advisory | ILM | 29 hr |
| Feb 24, 4:40 PM EST | Severe Thunderstorm Warning | ILM | 65 min |
| Feb 24, 8:11 PM EST | Wind Advisory | ILM | 16 hr |
| Mar 13, 5:00 PM EDT | Special Weather Statement | ILM | 60 min |
| Mar 13, 5:39 PM EDT | Special Weather Statement | ILM | 66 min |
| Mar 17, 10:09 AM EDT | River Flood Warning | CHS | 8 days |
| Mar 21, 3:25 AM EDT | Frost Advisory | ILM | 30 hr |
| Mar 26, 10:28 AM EDT | Special Weather Statement | ILM | 32 min |
| Apr 1, 9:23 AM EDT | Areal Flood Advisory | ILM | 52 min |
| Apr 7, 4:22 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 7, 5:15 AM EDT | Special Weather Statement | ILM | 60 min |
| Apr 7, 6:09 AM EDT | Special Weather Statement | ILM | 36 min |
| Apr 8, 5:42 AM EDT | Freeze Watch | ILM | 30 hr |
| Apr 8, 2:52 PM EDT | Freeze Warning | ILM | 42 hr |
| Apr 12, 11:45 PM EDT | Dense Fog Advisory | ILM | 2 hr |
| Apr 22, 12:38 PM EDT | Special Weather Statement | ILM | 52 min |
| Apr 22, 1:55 PM EDT | Special Weather Statement | ILM | 50 min |
| Apr 22, 9:03 PM EDT | Areal Flood Advisory | ILM | 117 min |
| May 1, 4:12 PM EDT | Areal Flood Advisory | ILM | 3 hr |
| May 3, 9:12 AM EDT | Special Weather Statement | ILM | 63 min |
| May 3, 2:52 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 5, 2:27 PM EDT | Special Weather Statement | ILM | 93 min |
| May 5, 3:09 PM EDT | Special Weather Statement | ILM | 51 min |
| May 5, 4:38 PM EDT | Special Weather Statement | ILM | 52 min |
| May 5, 5:29 PM EDT | Special Weather Statement | ILM | 91 min |
| May 5, 6:46 PM EDT | Special Weather Statement | ILM | 74 min |
| May 12, 7:34 PM EDT | Areal Flood Advisory | ILM | 56 min |
| May 12, 7:48 PM EDT | Special Weather Statement | ILM | 57 min |
| May 13, 1:30 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 13, 3:23 PM EDT | Special Weather Statement | ILM | 67 min |
| May 22, 10:34 PM EDT | Severe Thunderstorm Warning | ILM | 38 min |
| May 29, 10:13 AM EDT | River Flood Warning | CHS | 48 hr |
| Jun 4, 4:54 PM EDT | Special Weather Statement | ILM | 66 min |
| Jun 5, 3:48 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 6, 9:34 AM EDT | Flash Flood Watch | ILM | 19 hr |
| Jun 15, 1:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 15, 3:18 PM EDT | Special Weather Statement | ILM | 42 min |
| Jun 17, 12:59 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 1:52 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 17, 2:33 PM EDT | Special Weather Statement | ILM | 42 min |
| Jun 17, 2:50 PM EDT | Severe Thunderstorm Warning | ILM | 32 min |
| Jun 17, 3:20 PM EDT | Tornado Warning | ILM | 25 min |
| Jun 17, 3:25 PM EDT | Severe Thunderstorm Warning | ILM | 65 min |
| Jun 17, 3:42 PM EDT | Severe Thunderstorm Warning | ILM | 33 min |
| Jun 24, 4:52 PM EDT | Severe Thunderstorm Warning | ILM | 53 min |
| Jun 24, 5:28 PM EDT | Severe Thunderstorm Warning | ILM | 62 min |
| Jun 24, 6:25 PM EDT | Severe Thunderstorm Warning | ILM | 65 min |
| Jun 25, 4:16 PM EDT | Special Weather Statement | ILM | 59 min |
| Jun 25, 5:03 PM EDT | Severe Thunderstorm Warning | ILM | 42 min |
| Jun 25, 5:40 PM EDT | Severe Thunderstorm Warning | ILM | 48 min |
| Jun 28, 4:18 PM EDT | Special Weather Statement | ILM | 42 min |
| Jun 28, 5:22 PM EDT | Severe Thunderstorm Warning | ILM | 28 min |
| Jun 29, 4:15 AM EDT | Dense Fog Advisory | ILM | 5 hr |
| Jul 3, 3:12 AM EDT | Heat Advisory | ILM | 15 hr |
| Jul 3, 1:36 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 3:34 PM EDT | Heat Advisory | ILM | 51 hr |
| Jul 3, 5:45 PM EDT | Special Weather Statement | ILM | 45 min |
| Jul 3, 9:12 PM EDT | Special Weather Statement | ILM | 48 min |
| Jul 5, 6:29 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 6:45 PM EDT | Severe Thunderstorm Warning | ILM | 45 min |
| Jul 5, 7:31 PM EDT | Special Weather Statement | ILM | 29 min |
| Jul 5, 9:40 PM EDT | Heat Advisory | ILM | 21 hr |
| Jul 6, 3:44 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Jul 6, 4:03 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 6, 5:04 PM EDT | Severe Thunderstorm Warning | ILM | 56 min |
| Jul 6, 5:10 PM EDT | Special Weather Statement | ILM | 65 min |
| Jul 6, 5:20 PM EDT | Severe Thunderstorm Warning | ILM | 41 min |
| Jul 6, 9:07 PM EDT | Heat Advisory | ILM | 21 hr |
| Jul 7, 4:14 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 7, 7:24 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jul 7, 7:57 PM EDT | Heat Advisory | ILM | 23 hr |
| Jul 7, 9:37 PM EDT | Severe Thunderstorm Warning | ILM | 53 min |
| Jul 7, 10:34 PM EDT | Special Weather Statement | ILM | 41 min |
| Jul 7, 11:13 PM EDT | Special Weather Statement | ILM | 47 min |
| Jul 7, 11:50 PM EDT | Special Weather Statement | ILM | 40 min |
| Jul 8, 9:53 PM EDT | Mesoscale Discussion | SPC | 37 min |
| Jul 8, 11:52 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Jul 9, 12:23 AM EDT | Severe Thunderstorm Warning | ILM | 67 min |
| Jul 9, 1:07 AM EDT | Special Weather Statement | ILM | 53 min |
| Jul 9, 1:27 AM EDT | Severe Thunderstorm Warning | ILM | 63 min |
| Jul 9, 3:14 AM EDT | Heat Advisory | ILM | 12 hr |
| Jul 9, 6:31 PM EDT | Special Weather Statement | ILM | 29 min |
| Jul 9, 6:53 PM EDT | Severe Thunderstorm Warning | ILM | 31 min |
| Jul 10, 4:14 PM EDT | Special Weather Statement | ILM | 46 min |
| Jul 10, 4:16 PM EDT | Severe Thunderstorm Warning | ILM | 59 min |
| Jul 10, 4:21 PM EDT | Special Weather Statement | ILM | 39 min |
| Jul 10, 4:27 PM EDT | Severe Thunderstorm Warning | ILM | 19 min |
| Jul 10, 4:56 PM EDT | Severe Thunderstorm Warning | ILM | 48 min |
| Jul 10, 5:13 PM EDT | Special Weather Statement | ILM | 47 min |
| Jul 11, 1:46 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 11, 8:47 PM EDT | Special Weather Statement | ILM | 58 min |
| Jul 11, 8:51 PM EDT | Severe Thunderstorm Warning | ILM | 54 min |
| Jul 12, 3:11 PM EDT | Heat Advisory | ILM | 28 hr |
| Jul 13, 4:41 PM EDT | Special Weather Statement | ILM | 49 min |
| Jul 13, 7:51 PM EDT | Heat Advisory | ILM | 21 hr |
| Jul 14, 4:40 PM EDT | Special Weather Statement | ILM | 50 min |
| Jul 15, 1:28 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 3:36 PM EDT | Areal Flood Advisory | ILM | 114 min |
| Jul 16, 10:45 PM EDT | Special Weather Statement | ILM | 60 min |
| Jul 19, 10:49 PM EDT | Special Weather Statement | ILM | 41 min |
| Jul 19, 11:34 PM EDT | Areal Flood Advisory | ILM | 116 min |
| Jul 23, 3:31 PM EDT | Heat Advisory | ILM | 28 hr |
| Jul 25, 3:07 PM EDT | Heat Advisory | ILM | 28 hr |
| Jul 27, 3:19 AM EDT | Heat Advisory | ILM | 16 hr |
| Jul 28, 3:13 AM EDT | Heat Advisory | ILM | 17 hr |
| Jul 29, 4:17 PM EDT | Heat Advisory | ILM | 27 hr |
| Jul 30, 8:07 PM EDT | Special Weather Statement | ILM | 68 min |
| Jul 31, 2:50 AM EDT | Heat Advisory | ILM | 16 hr |
| Jul 31, 3:33 PM EDT | Special Weather Statement | ILM | 42 min |
| Jul 31, 4:37 PM EDT | Severe Thunderstorm Warning | ILM | 22 min |
| Aug 1, 8:39 PM EDT | Special Weather Statement | ILM | 66 min |
| Aug 10, 3:38 PM EDT | Areal Flood Advisory | ILM | 3 hr |
| Aug 18, 5:03 PM EDT | Severe Thunderstorm Warning | ILM | 57 min |
| Aug 18, 5:15 PM EDT | Special Weather Statement | ILM | 45 min |
| Aug 18, 5:55 PM EDT | Severe Thunderstorm Warning | ILM | 43 min |
| Aug 29, 2:32 PM EDT | Special Weather Statement | ILM | 58 min |
| Sep 1, 4:14 AM EDT | Flash Flood Watch | ILM | 42 hr |
| Sep 1, 5:09 AM EDT | Tropical Storm Watch | ILM | 7 hr |
| Sep 1, 11:25 AM EDT | Tropical Storm Warning | ILM | 39 hr |
| Sep 2, 5:05 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 2, 7:51 AM EDT | Tornado Watch | SPC | 8 hr |
| Sep 2, 10:23 AM EDT | River Flood Warning | ILM | 35 hr |
| Sep 2, 12:55 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 2, 3:29 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 2, 3:45 PM EDT | Tornado Watch | SPC | 11 hr |
| Sep 2, 6:09 PM EDT | Areal Flood Advisory | ILM | 4 hr |
| Sep 12, 1:42 PM EDT | Special Weather Statement | ILM | 33 min |
| Sep 12, 3:36 PM EDT | Areal Flood Advisory | ILM | 54 min |
| Sep 14, 6:14 PM EDT | Areal Flood Advisory | ILM | 3 hr |
| Sep 19, 5:17 PM EDT | Areal Flood Advisory | ILM | 3 hr |
| Sep 29, 1:48 PM EDT | Special Weather Statement | ILM | 27 min |
| Oct 6, 10:37 AM EDT | Flash Flood Watch | ILM | 59 hr |
| Oct 6, 5:53 PM EDT | Tropical Storm Warning | ILM | 69 hr |
| Oct 7, 10:54 AM EDT | River Flood Warning | ILM | 10 days |
| Oct 8, 12:29 AM EDT | Tornado Warning | ILM | 31 min |
| Oct 8, 12:57 AM EDT | Areal Flood Advisory | ILM | 4 hr |
| Oct 8, 2:04 AM EDT | Tornado Warning | ILM | 26 min |
| Oct 8, 3:54 AM EDT | River Flood Warning | CHS | 5 days |
| Oct 8, 5:13 AM EDT | Flash Flood Warning | ILM | 8 hr |
| Oct 8, 10:19 AM EDT | Flash Flood Warning | ILM | 6 hr |
| Oct 8, 4:07 PM EDT | Areal Flood Advisory | ILM | 4 hr |
| Oct 14, 11:18 AM EDT | Areal Flood Warning | ILM | 72 hr |
| Oct 17, 11:00 AM EDT | Areal Flood Warning | ILM | 48 hr |
| Oct 21, 5:05 AM EDT | Dense Fog Advisory | ILM | 4 hr |
| Nov 14, 9:50 PM EST | Dense Fog Advisory | ILM | 11 hr |
| Nov 19, 3:13 PM EST | Freeze Watch | ILM | 12 hr |
| Nov 20, 3:16 AM EST | Freeze Warning | ILM | 29 hr |
| Dec 27, 2:21 AM EST | Dense Fog 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 | 3 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 15 |
| Special Weather Statement | 49 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 2 |
| River Flood Warning | 6 |
| Flash Flood Watch | 3 |
| Areal Flood Advisory | 13 |
| Winter | |
| Winter Weather Advisory | 1 |
| Heat | |
| Heat Advisory | 14 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 2 |
| Frost Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
| Tropical | |
| Tropical Storm Warning | 2 |
| Tropical Storm Watch | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20152017
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.