Alert archive / South Carolina / Sumter County
Weather alerts in Sumter County, South Carolina, 2012
162 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Sumter County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 162
- Warnings
- 33
- Watches
- 11
- Advisories
- 54
- Busiest month
- July32 alerts
- Busiest day
- July 1, 20129 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 1 tornado warnings covering Sumter County in 2012 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 8 minutes after it went out.
Sumter County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 1 | 100% | 8 min |
| Severe thunderstorm warnings | 31 | 26 | 16% | 17 | 94% | 19 min |
| Flash flood warnings | 0 | 0 |
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 1, 3:25 AM EST | Lake Wind Advisory | CAE | 63 hr |
| Jan 10, 1:48 AM EST | Dense Fog Advisory | CAE | 6 hr |
| Jan 10, 8:09 AM EST | Dense Fog Advisory | CAE | 111 min |
| Jan 12, 3:58 AM EST | Lake Wind Advisory | CAE | 39 hr |
| Jan 14, 6:50 PM EST | Lake Wind Advisory | CAE | 14 hr |
| Jan 23, 9:30 AM EST | Dense Fog Advisory | CAE | 25 hr |
| Jan 26, 7:47 AM EST | Dense Fog Advisory | CAE | 3 hr |
| Jan 27, 1:26 AM EST | Lake Wind Advisory | CAE | 16 hr |
| Feb 10, 2:19 PM EST | Fire Weather Watch | CAE | 14 hr |
| Feb 10, 2:19 PM EST | Lake Wind Advisory | CAE | 42 hr |
| Feb 11, 4:04 AM EST | Red Flag Warning | CAE | 14 hr |
| Feb 24, 4:18 AM EST | Lake Wind Advisory | CAE | 38 hr |
| Feb 24, 8:48 AM EST | Tornado Watch | SPC | 7 hr |
| Feb 24, 11:10 AM EST | Mesoscale Discussion | SPC | 65 min |
| Feb 24, 1:33 PM EST | Severe Thunderstorm Warning | CAE | 42 min |
| Feb 24, 1:43 PM EST | Tornado Warning | CAE | 17 min |
| Feb 24, 1:50 PM EST | Mesoscale Discussion | SPC | 85 min |
| Feb 28, 12:01 AM EST | Dense Fog Advisory | CAE | 10 hr |
| Mar 2, 6:43 AM EST | Special Weather Statement | CAE | 47 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 3, 5:55 AM EST | Severe Thunderstorm Warning | CAE | 80 min |
| Mar 3, 8:21 PM EST | Lake Wind Advisory | CAE | 24 hr |
| Mar 4, 9:49 PM EST | Lake Wind Advisory | CAE | 21 hr |
| Mar 14, 5:08 AM EDT | Dense Fog Advisory | CAE | 6 hr |
| Mar 19, 5:37 AM EDT | Dense Fog Advisory | CAE | 3 hr |
| Mar 21, 3:46 AM EDT | Dense Fog Advisory | CAE | 6 hr |
| Mar 23, 6:01 AM EDT | Dense Fog Advisory | CAE | 4 hr |
| Mar 24, 1:53 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 24, 3:16 PM EDT | Severe Thunderstorm Warning | CAE | 59 min |
| Mar 24, 7:21 PM EDT | Severe Thunderstorm Warning | CAE | 39 min |
| Mar 24, 7:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Mar 24, 8:00 PM EDT | Severe Thunderstorm Warning | CAE | 45 min |
| Mar 24, 8:43 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 24, 10:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Apr 2, 1:48 PM EDT | Mesoscale Discussion | SPC | 87 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, 2:27 PM EDT | Severe Thunderstorm Warning | CAE | 48 min |
| Apr 5, 3:19 PM EDT | Severe Thunderstorm Warning | CAE | 26 min |
| Apr 5, 3:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Apr 5, 6:35 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Apr 11, 4:33 AM EDT | Frost Advisory | CAE | 28 hr |
| Apr 12, 2:33 PM EDT | Frost Advisory | CAE | 18 hr |
| Apr 18, 2:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Apr 21, 5:25 AM EDT | Dense Fog Advisory | CAE | 5 hr |
| Apr 23, 2:56 AM EDT | Lake Wind Advisory | CAE | 18 hr |
| Apr 24, 2:57 AM EDT | Lake Wind Advisory | CAE | 16 hr |
| Apr 25, 4:33 PM EDT | Lake Wind Advisory | CAE | 26 hr |
| Apr 26, 7:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 27, 11:34 AM EDT | Mesoscale Discussion | SPC | 56 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, 7:52 PM EDT | Severe Thunderstorm Warning | CAE | 23 min |
| Apr 27, 8:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 30, 7:23 AM EDT | Dense Fog Advisory | CAE | 108 min |
| May 3, 7:18 AM EDT | Dense Fog Advisory | CAE | 96 min |
| May 5, 6:43 PM EDT | Special Weather Statement | CAE | 62 min |
| May 9, 11:32 AM EDT | Mesoscale Discussion | SPC | 88 min |
| May 9, 2:08 PM EDT | Special Weather Statement | CAE | 67 min |
| May 9, 3:08 PM EDT | Special Weather Statement | CAE | 22 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, 6:39 PM EDT | Severe Thunderstorm Warning | CAE | 36 min |
| May 15, 8:14 PM EDT | Severe Thunderstorm Warning | CAE | 46 min |
| May 15, 8:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 15, 10:21 PM EDT | Areal Flood Advisory | CAE | 114 min |
| May 16, 5:46 PM EDT | Special Weather Statement | CAE | 29 min |
| May 17, 3:18 PM EDT | Severe Thunderstorm Warning | CAE | 42 min |
| May 23, 1:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 24, 6:29 AM EDT | Dense Fog Advisory | CAE | 3 hr |
| May 27, 4:20 AM EDT | Lake Wind Advisory | CAE | 16 hr |
| May 30, 6:35 AM EDT | Lake Wind Advisory | CAE | 4 hr |
| Jun 1, 1:54 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jun 1, 2:13 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 1, 4:31 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jun 1, 7:42 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 11, 12:39 PM EDT | Flood Watch | CAE | 39 hr |
| Jun 11, 12:39 PM EDT | Areal Flood Advisory | CAE | 111 min |
| Jun 11, 2:53 PM EDT | Areal Flood Advisory | CAE | 112 min |
| Jun 13, 4:14 PM EDT | Severe Thunderstorm Warning | CAE | 46 min |
| Jun 13, 5:15 PM EDT | Severe Thunderstorm Warning | CAE | 45 min |
| Jun 24, 12:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 29, 2:39 PM EDT | Heat Advisory | CAE | 29 hr |
| Jun 30, 2:27 PM EDT | Heat Advisory | CAE | 30 hr |
| 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, 3:16 PM EDT | Severe Thunderstorm Warning | CAE | 59 min |
| Jul 1, 4:15 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jul 1, 4:32 PM EDT | Severe Thunderstorm Warning | CAE | 43 min |
| Jul 1, 4:58 PM EDT | Severe Thunderstorm Warning | CAE | 47 min |
| Jul 1, 5:26 PM EDT | Severe Thunderstorm Warning | CAE | 49 min |
| Jul 1, 5:45 PM EDT | Special Weather Statement | CAE | 60 min |
| Jul 1, 7:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 1, 9:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jul 5, 1:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 5, 6:18 PM EDT | Severe Thunderstorm Warning | CAE | 42 min |
| Jul 5, 6:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jul 9, 8:56 PM EDT | Special Weather Statement | CAE | 64 min |
| Jul 9, 10:08 PM EDT | Special Weather Statement | CAE | 67 min |
| Jul 10, 12:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 10, 3:11 PM EDT | Severe Thunderstorm Warning | CAE | 49 min |
| Jul 10, 3:40 PM EDT | Severe Thunderstorm Warning | CAE | 50 min |
| Jul 10, 4:15 PM EDT | Severe Thunderstorm Warning | CAE | 45 min |
| Jul 11, 1:30 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 16, 4:26 PM EDT | Severe Thunderstorm Warning | CAE | 49 min |
| Jul 17, 6:37 PM EDT | Special Weather Statement | CAE | 23 min |
| Jul 21, 2:17 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 4:39 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 4:38 PM EDT | Special Weather Statement | CAE | 37 min |
| Jul 24, 6:46 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 24, 7:12 PM EDT | Special Weather Statement | CAE | 63 min |
| Jul 24, 8:42 PM EDT | Special Weather Statement | CAE | 63 min |
| Jul 29, 1:08 AM EDT | Special Weather Statement | CAE | 67 min |
| Jul 29, 2:35 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 29, 7:57 PM EDT | Special Weather Statement | CAE | 63 min |
| Jul 30, 4:37 PM EDT | Areal Flood Advisory | CAE | 53 min |
| Aug 2, 3:19 PM EDT | Severe Thunderstorm Warning | CAE | 56 min |
| Aug 2, 4:18 PM EDT | Severe Thunderstorm Warning | CAE | 57 min |
| Aug 2, 5:10 PM EDT | Severe Thunderstorm Warning | CAE | 50 min |
| Aug 8, 11:20 PM EDT | Special Weather Statement | CAE | 55 min |
| Aug 9, 9:47 PM EDT | Special Weather Statement | CAE | 58 min |
| Aug 11, 11:25 AM EDT | Special Weather Statement | CAE | 50 min |
| Aug 11, 12:38 PM EDT | Special Weather Statement | CAE | 37 min |
| Aug 13, 6:25 AM EDT | Dense Fog Advisory | CAE | 3 hr |
| Aug 14, 6:45 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 17, 2:58 PM EDT | Special Weather Statement | CAE | 77 min |
| Aug 17, 3:09 PM EDT | Severe Thunderstorm Warning | CAE | 66 min |
| Aug 17, 3:28 PM EDT | Severe Thunderstorm Warning | CAE | 62 min |
| Aug 17, 3:48 PM EDT | Severe Thunderstorm Warning | CAE | 57 min |
| Aug 29, 3:52 PM EDT | Areal Flood Advisory | CAE | 53 min |
| Aug 30, 10:29 PM EDT | Dense Fog Advisory | CAE | 11 hr |
| Sep 3, 1:52 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Sep 6, 11:30 PM EDT | Special Weather Statement | CAE | 60 min |
| Sep 7, 1:27 AM EDT | Special Weather Statement | CAE | 63 min |
| Sep 8, 6:15 PM EDT | Special Weather Statement | CAE | 60 min |
| Sep 18, 11:35 AM EDT | Mesoscale Discussion | SPC | 85 min |
| Sep 18, 1:46 PM EDT | Special Weather Statement | CAE | 59 min |
| Sep 27, 6:23 AM EDT | Dense Fog Advisory | CAE | 4 hr |
| Oct 1, 3:20 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Oct 24, 5:29 AM EDT | Dense Fog Advisory | CAE | 5 hr |
| Oct 26, 1:59 PM EDT | Lake Wind Advisory | CAE | 4 days |
| Oct 31, 4:20 AM EDT | Lake Wind Advisory | CAE | 15 hr |
| Nov 2, 7:28 AM EDT | Lake Wind Advisory | CAE | 11 hr |
| Nov 4, 2:34 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Nov 4, 5:40 PM EST | Severe Thunderstorm Warning | CAE | 50 min |
| Dec 3, 3:50 AM EST | Dense Fog Advisory | CAE | 6 hr |
| Dec 8, 2:10 AM EST | Dense Fog Advisory | CAE | 8 hr |
| Dec 9, 6:39 AM EST | Dense Fog Advisory | CAE | 4 hr |
| Dec 10, 12:14 AM EST | Dense Fog Advisory | CAE | 8 hr |
| Dec 18, 4:13 AM EST | Lake Wind Advisory | CAE | 13 hr |
| Dec 19, 2:14 PM EST | Lake Wind Advisory | CAE | 33 hr |
| Dec 20, 11:20 PM EST | Lake Wind Advisory | CAE | 5 hr |
| Dec 20, 11:20 PM EST | Wind Advisory | CAE | 20 hr |
| Dec 21, 7:23 PM EST | Lake Wind Advisory | CAE | 10 hr |
| Dec 26, 2:58 AM EST | Wind Advisory | CAE | 21 hr |
| Dec 26, 8:07 AM EST | Mesoscale Discussion | SPC | 83 min |
| Dec 26, 9:14 AM EST | Severe Thunderstorm Warning | CAE | 61 min |
| Dec 26, 11:56 PM EST | Lake Wind Advisory | CAE | 7 hr |
| Dec 29, 7:54 AM EST | Lake Wind Advisory | CAE | 17 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 | 31 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 8 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 41 |
| Special Weather Statement | 23 |
| Flooding | |
| Flood Watch | 1 |
| Areal Flood Advisory | 5 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Frost Advisory | 2 |
| Wind and dust | |
| Lake Wind Advisory | 22 |
| Wind Advisory | 2 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 21 |
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.