Alert archive / South Carolina / Lancaster County
Weather alerts in Lancaster County, South Carolina, 2012
104 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Lancaster County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 104
- Warnings
- 27
- Watches
- 7
- Advisories
- 12
- Busiest month
- July37 alerts
- Busiest day
- July 1, 20127 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Lancaster County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 24 | 18 | 25% | 14 | 86% | 17 min |
| Flash flood warnings | 3 | 3 | 0% | 15 | 80% | 70 min |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Columbia, SC: tornado warnings | 9 | 3 | 67% | 5 | 60% | 4 min |
| NWS Columbia, SC: severe thunderstorm warnings | 246 | 183 | 26% | 396 | 86% | 22 min |
| NWS Columbia, SC: flash flood warnings | 14 | 12 | 14% | 39 | 90% | 46 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 17, 9:01 PM EST | Special Weather Statement | CAE | 59 min |
| Feb 23, 12:25 AM EST | Special Weather Statement | CAE | 80 min |
| Feb 24, 6:56 AM EST | Mesoscale Discussion | SPC | 94 min |
| Feb 24, 8:48 AM EST | Tornado Watch | SPC | 7 hr |
| Mar 2, 7:08 AM EST | Severe Thunderstorm Warning | CAE | 52 min |
| Mar 3, 3:58 AM EST | Mesoscale Discussion | SPC | 92 min |
| Mar 3, 4:39 AM EST | Severe Thunderstorm Watch | SPC | 4 hr |
| Mar 3, 5:23 AM EST | Severe Thunderstorm Warning | CAE | 67 min |
| Mar 24, 12:03 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Mar 24, 1:53 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 24, 4:16 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Mar 24, 6:02 PM EDT | Severe Thunderstorm Warning | CAE | 43 min |
| Mar 24, 6:42 PM EDT | Severe Thunderstorm Warning | CAE | 48 min |
| Mar 24, 7:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Apr 2, 1:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Apr 2, 4:31 PM EDT | Severe Thunderstorm Warning | CAE | 44 min |
| Apr 5, 1:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Apr 5, 1:47 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 5, 3:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Apr 26, 10:37 AM EDT | Special Weather Statement | CAE | 38 min |
| Apr 26, 11:19 AM EDT | Special Weather Statement | CAE | 41 min |
| Apr 27, 2:42 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 27, 5:36 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 27, 8:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| May 9, 11:32 AM EDT | Mesoscale Discussion | SPC | 88 min |
| May 14, 5:25 PM EDT | Special Weather Statement | CAE | 35 min |
| May 14, 7:38 PM EDT | Severe Thunderstorm Warning | CAE | 52 min |
| May 14, 8:19 PM EDT | Areal Flood Advisory | CAE | 116 min |
| May 15, 1:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 15, 2:27 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 15, 6:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| May 15, 8:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 16, 4:21 PM EDT | Special Weather Statement | CAE | 54 min |
| May 22, 9:33 PM EDT | Special Weather Statement | CAE | 57 min |
| Jun 1, 2:22 PM EDT | Special Weather Statement | CAE | 53 min |
| Jun 1, 7:11 PM EDT | Special Weather Statement | CAE | 34 min |
| Jun 1, 7:21 PM EDT | Special Weather Statement | CAE | 39 min |
| Jun 11, 12:39 PM EDT | Areal Flood Advisory | CAE | 111 min |
| Jun 11, 1:59 PM EDT | Areal Flood Advisory | CAE | 2 hr |
| Jun 23, 6:23 PM EDT | Special Weather Statement | CAE | 52 min |
| Jun 23, 9:57 PM EDT | Special Weather Statement | CAE | 63 min |
| Jun 23, 10:26 PM EDT | Special Weather Statement | CAE | 34 min |
| Jun 23, 10:38 PM EDT | Areal Flood Advisory | CAE | 112 min |
| Jun 24, 12:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 24, 5:02 PM EDT | Areal Flood Advisory | CAE | 58 min |
| Jul 1, 1:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 1, 2:01 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 1, 2:12 PM EDT | Severe Thunderstorm Warning | CAE | 48 min |
| Jul 1, 3:30 PM EDT | Severe Thunderstorm Warning | CAE | 60 min |
| Jul 1, 4:27 PM EDT | Severe Thunderstorm Warning | CAE | 48 min |
| Jul 1, 7:18 PM EDT | Severe Thunderstorm Warning | CAE | 72 min |
| Jul 1, 7:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 1, 9:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jul 3, 6:23 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 3, 8:56 PM EDT | Special Weather Statement | CAE | 49 min |
| Jul 5, 1:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 5, 5:30 PM EDT | Severe Thunderstorm Warning | CAE | 45 min |
| Jul 5, 6:34 PM EDT | Severe Thunderstorm Warning | CAE | 41 min |
| Jul 5, 6:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jul 5, 7:14 PM EDT | Severe Thunderstorm Warning | CAE | 46 min |
| Jul 9, 3:41 PM EDT | Severe Thunderstorm Warning | CAE | 49 min |
| Jul 10, 12:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 16, 12:58 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 16, 5:24 PM EDT | Severe Thunderstorm Warning | CAE | 51 min |
| Jul 20, 2:47 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 3:23 PM EDT | Special Weather Statement | CAE | 37 min |
| Jul 20, 6:27 PM EDT | Areal Flood Advisory | CAE | 2 hr |
| Jul 21, 1:49 PM EDT | Special Weather Statement | CAE | 56 min |
| Jul 21, 2:17 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 2:20 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 12:58 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 24, 1:29 AM EDT | Severe Thunderstorm Warning | CAE | 46 min |
| Jul 24, 1:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jul 24, 4:52 PM EDT | Special Weather Statement | GSP | 23 min |
| Jul 24, 6:04 PM EDT | Severe Thunderstorm Warning | CAE | 41 min |
| Jul 28, 2:18 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 28, 8:01 PM EDT | Special Weather Statement | CAE | 59 min |
| Jul 28, 8:21 PM EDT | Severe Thunderstorm Warning | CAE | 39 min |
| Jul 28, 9:04 PM EDT | Special Weather Statement | CAE | 56 min |
| Jul 28, 9:08 PM EDT | Severe Thunderstorm Warning | CAE | 52 min |
| Jul 28, 11:28 PM EDT | Special Weather Statement | CAE | 47 min |
| Jul 30, 4:38 PM EDT | Severe Thunderstorm Warning | CAE | 52 min |
| Aug 2, 9:56 PM EDT | Areal Flood Advisory | CAE | 64 min |
| Aug 3, 9:04 PM EDT | Severe Thunderstorm Warning | CAE | 26 min |
| Aug 7, 8:07 PM EDT | Areal Flood Advisory | CAE | 113 min |
| Aug 9, 9:47 PM EDT | Special Weather Statement | CAE | 58 min |
| Aug 9, 11:22 PM EDT | Areal Flood Advisory | CAE | 53 min |
| Aug 17, 6:17 PM EDT | Severe Thunderstorm Warning | CAE | 58 min |
| Aug 17, 7:11 PM EDT | Severe Thunderstorm Warning | CAE | 64 min |
| Aug 28, 4:49 PM EDT | Areal Flood Advisory | CAE | 116 min |
| Sep 3, 1:52 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Sep 4, 6:02 PM EDT | Special Weather Statement | CAE | 28 min |
| Sep 8, 1:14 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 17, 5:06 AM EDT | Areal Flood Advisory | CAE | 114 min |
| Sep 17, 5:25 AM EDT | Flash Flood Warning | CAE | 110 min |
| Sep 17, 7:23 AM EDT | Flash Flood Warning | CAE | 3 hr |
| Sep 17, 7:53 AM EDT | Flash Flood Warning | CAE | 3 hr |
| Sep 17, 9:07 AM EDT | Areal Flood Advisory | CAE | 113 min |
| Sep 18, 11:35 AM EDT | Mesoscale Discussion | SPC | 85 min |
| Sep 29, 5:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Sep 29, 6:39 PM EDT | Severe Thunderstorm Warning | CAE | 51 min |
| Oct 2, 9:41 AM EDT | Mesoscale Discussion | SPC | 94 min |
| Dec 20, 6:37 PM EST | Special Weather Statement | CAE | 83 min |
| Dec 26, 8:07 AM EST | Mesoscale Discussion | SPC | 83 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 | 24 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 35 |
| Special Weather Statement | 23 |
| Flooding | |
| Flash Flood Warning | 3 |
| Areal Flood Advisory | 12 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20112013
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.