Alert archive / South Carolina / Sumter County
Weather alerts in Sumter County, South Carolina, 2015
154 weather alerts in 2015, 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 2015. Tap one for its archive.
- Alerts
- 154
- Warnings
- 45
- Watches
- 10
- Advisories
- 61
- Busiest month
- October25 alerts
- Busiest day
- October 4, 20157 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Sumter County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 32 | 28 | 13% | 19 | 89% | 23 min |
| Flash flood warnings | 9 | 9 | 0% | 3 | 100% | 65 min |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Columbia, SC: tornado warnings | 5 | 3 | 40% | 5 | 60% | 12 min |
| NWS Columbia, SC: severe thunderstorm warnings | 183 | 140 | 23% | 309 | 91% | 23 min |
| NWS Columbia, SC: flash flood warnings | 39 | 30 | 23% | 110 | 94% | 77 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 3, 5:07 PM EST | Dense Fog Advisory | CAE | 11 hr |
| Jan 4, 1:39 PM EST | Mesoscale Discussion | SPC | 96 min |
| Jan 4, 1:53 PM EST | Special Weather Statement | CAE | 52 min |
| Jan 4, 2:49 PM EST | Special Weather Statement | CAE | 86 min |
| Jan 4, 3:26 PM EST | Special Weather Statement | CAE | 34 min |
| Jan 7, 2:33 AM EST | Lake Wind Advisory | CAE | 26 hr |
| Jan 7, 2:33 AM EST | Wind Chill Advisory | CAE | 30 hr |
| Jan 12, 12:17 PM EST | Areal Flood Advisory | CAE | 118 min |
| Jan 12, 11:55 PM EST | Dense Fog Advisory | CAE | 8 hr |
| Jan 17, 8:35 PM EST | Lake Wind Advisory | CAE | 25 hr |
| Jan 24, 9:34 AM EST | Lake Wind Advisory | CAE | 7 hr |
| Jan 26, 4:41 AM EST | Lake Wind Advisory | CAE | 17 hr |
| Feb 1, 2:31 PM EST | Lake Wind Advisory | CAE | 21 hr |
| Feb 2, 11:26 AM EST | Wind Advisory | CAE | 5 hr |
| Feb 2, 4:55 PM EST | Lake Wind Advisory | CAE | 5 hr |
| Feb 11, 2:50 PM EST | Lake Wind Advisory | CAE | 38 hr |
| Feb 13, 3:00 PM EST | Fire Weather Watch | CAE | 13 hr |
| Feb 14, 3:28 AM EST | Lake Wind Advisory | CAE | 32 hr |
| Feb 14, 3:43 AM EST | Red Flag Warning | CAE | 15 hr |
| Feb 18, 3:55 AM EST | Lake Wind Advisory | CAE | 9 hr |
| Feb 18, 4:04 AM EST | Wind Chill Advisory | CAE | 31 hr |
| Feb 18, 9:13 AM EST | Lake Wind Advisory | CAE | 23 hr |
| Feb 18, 9:13 AM EST | Wind Advisory | CAE | 10 hr |
| Feb 23, 2:55 PM EST | Winter Weather Advisory | CAE | 25 hr |
| Feb 28, 3:20 PM EST | Freezing Rain Advisory | CAE | 19 hr |
| Mar 2, 1:53 AM EST | Dense Fog Advisory | CAE | 7 hr |
| Mar 3, 7:44 PM EST | Dense Fog Advisory | CAE | 14 hr |
| Mar 5, 2:32 AM EST | Lake Wind Advisory | CAE | 25 hr |
| Mar 27, 2:37 PM EDT | Freeze Watch | CAE | 12 hr |
| Mar 28, 2:54 AM EDT | Freeze Warning | CAE | 31 hr |
| Apr 7, 10:37 PM EDT | Severe Thunderstorm Warning | CAE | 38 min |
| Apr 7, 11:12 PM EDT | Severe Thunderstorm Warning | CAE | 48 min |
| Apr 8, 12:00 AM EDT | Severe Thunderstorm Warning | CAE | 45 min |
| Apr 8, 12:11 AM EDT | Severe Thunderstorm Warning | CAE | 49 min |
| Apr 9, 5:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Apr 14, 4:29 PM EDT | Mesoscale Discussion | SPC | 46 min |
| Apr 19, 1:04 PM EDT | Tornado Watch | SPC | 7 hr |
| Apr 19, 4:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 19, 5:24 PM EDT | Severe Thunderstorm Warning | CAE | 66 min |
| Apr 26, 1:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 11, 2:38 PM EDT | Severe Thunderstorm Warning | CAE | 37 min |
| May 11, 3:16 PM EDT | Severe Thunderstorm Warning | CAE | 49 min |
| May 11, 3:24 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 12, 1:55 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 4, 2:22 AM EDT | Flash Flood Warning | CAE | 3 hr |
| Jun 4, 3:31 AM EDT | Areal Flood Advisory | CAE | 119 min |
| Jun 10, 5:25 PM EDT | Special Weather Statement | CAE | 65 min |
| Jun 17, 7:45 PM EDT | Special Weather Statement | CAE | 45 min |
| Jun 18, 1:32 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 2:57 PM EDT | Severe Thunderstorm Warning | CAE | 33 min |
| Jun 18, 3:30 PM EDT | Severe Thunderstorm Warning | CAE | 60 min |
| Jun 18, 4:02 PM EDT | Severe Thunderstorm Warning | CAE | 43 min |
| Jun 18, 4:11 PM EDT | Severe Thunderstorm Warning | CAE | 64 min |
| Jun 19, 4:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 19, 11:08 PM EDT | Special Weather Statement | CAE | 52 min |
| Jun 22, 5:59 PM EDT | Severe Thunderstorm Warning | CAE | 50 min |
| Jun 24, 7:28 PM EDT | Severe Thunderstorm Warning | CAE | 62 min |
| Jun 24, 9:10 PM EDT | Severe Thunderstorm Warning | CAE | 50 min |
| Jun 27, 2:20 PM EDT | Special Weather Statement | CAE | 55 min |
| Jun 27, 6:14 PM EDT | Severe Thunderstorm Warning | CAE | 61 min |
| Jun 27, 6:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 6:59 PM EDT | Severe Thunderstorm Warning | CAE | 61 min |
| Jun 27, 7:56 PM EDT | Severe Thunderstorm Warning | CAE | 51 min |
| Jun 30, 1:53 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 30, 4:33 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 30, 5:17 PM EDT | Severe Thunderstorm Warning | CAE | 58 min |
| Jun 30, 6:03 PM EDT | Severe Thunderstorm Warning | CAE | 27 min |
| Jul 2, 2:58 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 2, 3:45 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 2, 5:27 PM EDT | Severe Thunderstorm Warning | CAE | 63 min |
| Jul 2, 6:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jul 3, 9:33 AM EDT | Flash Flood Watch | CAE | 4 hr |
| Jul 13, 5:31 PM EDT | Severe Thunderstorm Warning | CAE | 29 min |
| Jul 13, 10:58 PM EDT | Severe Thunderstorm Warning | CAE | 62 min |
| Jul 13, 11:43 PM EDT | Special Weather Statement | CAE | 62 min |
| Jul 18, 2:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 18, 6:22 PM EDT | Severe Thunderstorm Warning | CAE | 53 min |
| Jul 19, 7:26 PM EDT | Severe Thunderstorm Warning | CAE | 64 min |
| Jul 21, 5:09 AM EDT | Heat Advisory | CAE | 15 hr |
| Jul 21, 7:20 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 23, 12:58 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 23, 3:58 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 5, 4:53 PM EDT | Severe Thunderstorm Warning | CAE | 37 min |
| Aug 6, 3:20 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 6, 4:32 PM EDT | Severe Thunderstorm Warning | CAE | 58 min |
| Aug 6, 5:36 PM EDT | Special Weather Statement | CAE | 54 min |
| Aug 6, 5:46 PM EDT | Severe Thunderstorm Warning | CAE | 44 min |
| Aug 6, 6:08 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Aug 6, 6:51 PM EDT | Special Weather Statement | CAE | 54 min |
| Aug 11, 8:38 PM EDT | Areal Flood Advisory | CAE | 112 min |
| Aug 18, 4:38 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 18, 11:31 PM EDT | Special Weather Statement | CAE | 59 min |
| Aug 18, 11:35 PM EDT | Special Weather Statement | CAE | 55 min |
| Aug 21, 2:34 PM EDT | Special Weather Statement | CAE | 56 min |
| Aug 21, 3:09 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Aug 25, 9:29 PM EDT | Areal Flood Advisory | CAE | 106 min |
| Aug 30, 4:37 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Sep 3, 4:55 PM EDT | Severe Thunderstorm Warning | CAE | 65 min |
| Sep 3, 5:14 PM EDT | Special Weather Statement | CAE | 61 min |
| Sep 4, 6:34 PM EDT | Special Weather Statement | CAE | 26 min |
| Sep 4, 10:59 PM EDT | Special Weather Statement | CAE | 46 min |
| Sep 4, 11:10 PM EDT | Severe Thunderstorm Warning | CAE | 65 min |
| Sep 4, 11:56 PM EDT | Severe Thunderstorm Warning | CAE | 49 min |
| Sep 9, 6:25 AM EDT | Dense Fog Advisory | CAE | 3 hr |
| Sep 10, 5:42 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 10, 7:14 PM EDT | Severe Thunderstorm Warning | CAE | 46 min |
| Sep 21, 9:22 PM EDT | Severe Thunderstorm Warning | CAE | 38 min |
| Sep 21, 10:24 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Sep 25, 4:47 PM EDT | Areal Flood Advisory | CAE | 118 min |
| Sep 25, 4:56 PM EDT | Flash Flood Warning | CAE | 3 hr |
| Sep 30, 8:03 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Sep 30, 8:43 PM EDT | Flash Flood Warning | CAE | 3 hr |
| Oct 1, 12:05 PM EDT | Flash Flood Watch | CAE | 4 days |
| Oct 2, 10:31 PM EDT | Areal Flood Advisory | CAE | 6 hr |
| Oct 3, 4:07 AM EDT | Areal Flood Advisory | CAE | 6 hr |
| Oct 3, 3:00 PM EDT | Flash Flood Warning | CAE | 2 hr |
| Oct 3, 10:00 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Oct 3, 10:11 PM EDT | Areal Flood Advisory | CAE | 6 hr |
| Oct 3, 10:55 PM EDT | Flash Flood Warning | CAE | 3 hr |
| Oct 4, 1:40 AM EDT | Flash Flood Warning | CAE | 3 hr |
| Oct 4, 3:48 AM EDT | Flash Flood Warning | CAE | 6 hr |
| Oct 4, 7:47 AM EDT | Flash Flood Warning | CAE | 6 hr |
| Oct 4, 1:40 PM EDT | Areal Flood Warning | CAE | 30 hr |
| Oct 5, 2:29 AM EDT | Wind Advisory | CAE | 15 hr |
| Oct 10, 4:07 AM EDT | Flash Flood Watch | CAE | 20 hr |
| Oct 10, 9:27 AM EDT | Areal Flood Advisory | CAE | 2 hr |
| Oct 10, 11:47 AM EDT | Areal Flood Advisory | CAE | 3 hr |
| Oct 10, 6:06 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Oct 10, 6:17 PM EDT | Flash Flood Warning | CAE | 3 hr |
| Oct 10, 7:11 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Oct 10, 8:58 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Oct 10, 10:05 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Oct 11, 12:00 AM EDT | Areal Flood Advisory | CAE | 2 hr |
| Oct 17, 2:01 PM EDT | Lake Wind Advisory | CAE | 22 hr |
| Oct 19, 1:54 PM EDT | Frost Advisory | CAE | 19 hr |
| Nov 2, 4:25 AM EST | Dense Fog Advisory | CAE | 6 hr |
| Nov 14, 3:22 AM EST | Frost Advisory | CAE | 29 hr |
| Nov 14, 1:14 PM EST | Freeze Warning | CAE | 19 hr |
| Nov 19, 9:25 AM EST | Areal Flood Advisory | CAE | 110 min |
| Dec 1, 4:01 AM EST | Dense Fog Advisory | CAE | 7 hr |
| Dec 1, 9:22 PM EST | Dense Fog Advisory | CAE | 10 hr |
| Dec 8, 2:11 AM EST | Dense Fog Advisory | CAE | 8 hr |
| Dec 13, 9:50 PM EST | Dense Fog Advisory | CAE | 7 hr |
| Dec 17, 10:48 AM EST | Special Weather Statement | CAE | 27 min |
| Dec 17, 10:05 PM EST | Lake Wind Advisory | CAE | 21 hr |
| Dec 22, 9:03 AM EST | Areal Flood Advisory | CAE | 117 min |
| Dec 22, 11:33 PM EST | Dense Fog Advisory | CAE | 10 hr |
| Dec 23, 2:21 PM EST | Mesoscale Discussion | SPC | 84 min |
| Dec 23, 3:35 PM EST | Special Weather Statement | CAE | 55 min |
| Dec 23, 6:24 PM EST | Areal Flood Advisory | CAE | 4 hr |
| Dec 25, 11:46 PM EST | Dense Fog Advisory | CAE | 10 hr |
| Dec 26, 11:18 PM EST | Dense Fog Advisory | CAE | 7 hr |
| Dec 28, 1:45 AM EST | Dense Fog Advisory | CAE | 7 hr |
| Dec 30, 5:53 PM EST | Areal Flood Advisory | CAE | 3 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 | 32 |
| Severe Thunderstorm Watch | 4 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 20 |
| Special Weather Statement | 18 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 9 |
| Flash Flood Watch | 3 |
| Areal Flood Advisory | 24 |
| Winter | |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 1 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Lake Wind Advisory | 13 |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 14 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20142016
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.