Alert archive / South Carolina / Sumter County
Weather alerts in Sumter County, South Carolina, 2018
165 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 165
- Warnings
- 43
- Watches
- 13
- Advisories
- 61
- Busiest month
- June31 alerts
- Busiest day
- June 25, 20187 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 1 tornado warnings covering Sumter County in 2018 had a tornado report inside them.
Sumter County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 27 | 21 | 22% | 21 | 86% | 22 min |
| Flash flood warnings | 1 | 1 | 0% | 3 | 100% | 22 min |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Columbia, SC: tornado warnings | 10 | 4 | 60% | 11 | 73% | 8 min |
| NWS Columbia, SC: severe thunderstorm warnings | 174 | 130 | 25% | 327 | 87% | 18 min |
| NWS Columbia, SC: flash flood warnings | 14 | 11 | 21% | 46 | 100% | 149 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, 1:53 PM EST | Wind Chill Advisory | CAE | 19 hr |
| Jan 2, 9:47 PM EST | Winter Weather Advisory | CAE | 21 hr |
| Jan 3, 5:44 AM EST | Winter Storm Warning | CAE | 13 hr |
| Jan 4, 2:07 PM EST | Wind Chill Advisory | CAE | 19 hr |
| Jan 17, 4:39 AM EST | Winter Weather Advisory | CAE | 29 hr |
| Jan 17, 7:23 PM EST | Winter Weather Advisory | CAE | 15 hr |
| Jan 23, 2:44 AM EST | Lake Wind Advisory | CAE | 15 hr |
| Feb 4, 12:42 PM EST | Special Weather Statement | CAE | 63 min |
| Feb 7, 8:10 AM EST | Lake Wind Advisory | CAE | 9 hr |
| Feb 8, 3:55 PM EST | River Flood Warning | CAE | 4 days |
| Feb 10, 4:01 AM EST | Dense Fog Advisory | CAE | 6 hr |
| Feb 16, 3:17 AM EST | Lake Wind Advisory | CAE | 15 hr |
| Feb 19, 10:23 PM EST | Dense Fog Advisory | CAE | 13 hr |
| Feb 21, 5:12 AM EST | Dense Fog Advisory | CAE | 5 hr |
| Feb 24, 5:41 AM EST | Dense Fog Advisory | CAE | 3 hr |
| Feb 25, 5:13 AM EST | Lake Wind Advisory | CAE | 6 min |
| Feb 25, 5:19 AM EST | Lake Wind Advisory | CAE | 10 hr |
| Feb 28, 1:29 PM EST | Lake Wind Advisory | CAE | 53 hr |
| Mar 1, 2:05 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Mar 1, 3:38 PM EST | Severe Thunderstorm Warning | CAE | 22 min |
| Mar 1, 4:00 PM EST | Severe Thunderstorm Warning | CAE | 60 min |
| Mar 3, 10:16 AM EST | Lake Wind Advisory | CAE | 10 hr |
| Mar 4, 12:30 PM EST | Frost Advisory | CAE | 20 hr |
| Mar 4, 7:33 PM EST | Freeze Warning | CAE | 12 hr |
| Mar 6, 1:39 PM EST | Lake Wind Advisory | CAE | 29 hr |
| Mar 7, 2:10 PM EST | Frost Advisory | CAE | 18 hr |
| Mar 8, 3:16 AM EST | Freeze Warning | CAE | 29 hr |
| Mar 12, 3:09 AM EDT | Freeze Watch | CAE | 16 hr |
| Mar 12, 2:06 PM EDT | Freeze Warning | CAE | 19 hr |
| Mar 13, 2:23 PM EDT | Freeze Warning | CAE | 19 hr |
| Mar 14, 3:21 AM EDT | Freeze Warning | CAE | 30 hr |
| Mar 14, 3:07 PM EDT | Fire Weather Watch | CAE | 12 hr |
| Mar 15, 3:14 AM EDT | Lake Wind Advisory | CAE | 17 hr |
| Mar 15, 3:25 AM EDT | Red Flag Warning | CAE | 16 hr |
| Mar 20, 12:15 PM EDT | Lake Wind Advisory | CAE | 32 hr |
| Mar 22, 8:06 AM EDT | Freeze Warning | CAE | 25 hr |
| Apr 3, 5:34 AM EDT | Dense Fog Advisory | CAE | 3 hr |
| Apr 4, 11:42 AM EDT | Lake Wind Advisory | CAE | 12 hr |
| Apr 7, 3:09 PM EDT | Lake Wind Advisory | CAE | 17 hr |
| Apr 15, 3:56 AM EDT | Lake Wind Advisory | CAE | 40 hr |
| Apr 15, 11:15 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 15, 12:13 PM EDT | Tornado Watch | SPC | 9 hr |
| Apr 15, 3:17 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Apr 15, 3:32 PM EDT | Severe Thunderstorm Warning | CAE | 58 min |
| Apr 15, 5:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Apr 18, 9:12 AM EDT | Lake Wind Advisory | CAE | 34 hr |
| Apr 23, 6:13 AM EDT | Lake Wind Advisory | CAE | 18 hr |
| May 18, 11:24 AM EDT | Areal Flood Advisory | CAE | 3 hr |
| May 18, 12:37 PM EDT | Areal Flood Advisory | CAE | 113 min |
| May 22, 7:38 AM EDT | Dense Fog Advisory | CAE | 87 min |
| May 24, 2:50 PM EDT | Special Weather Statement | CAE | 40 min |
| May 27, 4:40 AM EDT | Flash Flood Watch | CAE | 39 hr |
| Jun 2, 9:12 PM EDT | Special Weather Statement | CAE | 63 min |
| Jun 11, 1:48 PM EDT | Special Weather Statement | CAE | 27 min |
| Jun 11, 2:22 PM EDT | Severe Thunderstorm Warning | CAE | 53 min |
| Jun 11, 3:07 PM EDT | Severe Thunderstorm Warning | CAE | 53 min |
| Jun 14, 7:32 PM EDT | Areal Flood Advisory | CAE | 58 min |
| Jun 14, 8:01 PM EDT | Severe Thunderstorm Warning | CAE | 44 min |
| Jun 15, 2:58 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 8:39 PM EDT | Severe Thunderstorm Warning | CAE | 51 min |
| Jun 15, 9:24 PM EDT | Severe Thunderstorm Warning | CAE | 36 min |
| Jun 15, 9:56 PM EDT | Severe Thunderstorm Warning | CAE | 49 min |
| Jun 16, 5:21 PM EDT | Special Weather Statement | CAE | 39 min |
| Jun 23, 3:38 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jun 24, 3:03 AM EDT | Heat Advisory | CAE | 17 hr |
| Jun 24, 5:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 24, 8:38 PM EDT | Severe Thunderstorm Warning | CAE | 37 min |
| Jun 24, 9:09 PM EDT | Severe Thunderstorm Warning | CAE | 36 min |
| Jun 25, 1:02 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 25, 5:57 PM EDT | Severe Thunderstorm Warning | CAE | 48 min |
| Jun 25, 6:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 6:57 PM EDT | Severe Thunderstorm Warning | CAE | 48 min |
| Jun 25, 7:41 PM EDT | Severe Thunderstorm Warning | CAE | 34 min |
| Jun 25, 8:14 PM EDT | Severe Thunderstorm Warning | CAE | 61 min |
| Jun 25, 8:43 PM EDT | Severe Thunderstorm Warning | CAE | 47 min |
| Jun 26, 6:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 27, 3:36 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 27, 5:55 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 6:42 PM EDT | Special Weather Statement | CAE | 48 min |
| Jun 27, 7:29 PM EDT | Severe Thunderstorm Warning | CAE | 46 min |
| Jun 29, 7:25 PM EDT | Special Weather Statement | CAE | 50 min |
| Jun 29, 8:15 PM EDT | Special Weather Statement | CAE | 45 min |
| Jun 29, 8:47 PM EDT | Severe Thunderstorm Warning | CAE | 43 min |
| Jul 12, 1:42 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 12, 4:08 PM EDT | Special Weather Statement | CAE | 22 min |
| Jul 17, 6:18 PM EDT | Special Weather Statement | CAE | 27 min |
| Jul 17, 6:59 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Jul 17, 7:29 PM EDT | Special Weather Statement | CAE | 31 min |
| Jul 17, 7:55 PM EDT | Severe Thunderstorm Warning | CAE | 35 min |
| Jul 18, 2:32 PM EDT | Special Weather Statement | CAE | 58 min |
| Jul 23, 1:24 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 1:52 PM EDT | Severe Thunderstorm Warning | CAE | 38 min |
| Jul 23, 2:47 PM EDT | Areal Flood Advisory | CAE | 118 min |
| Jul 23, 3:14 PM EDT | Severe Thunderstorm Warning | CAE | 46 min |
| Jul 23, 4:13 PM EDT | Areal Flood Advisory | CAE | 2 hr |
| Jul 23, 4:33 PM EDT | Tornado Warning | CAE | 27 min |
| Jul 25, 7:57 PM EDT | Severe Thunderstorm Warning | CAE | 48 min |
| Jul 26, 6:26 AM EDT | Dense Fog Advisory | CAE | 116 min |
| Jul 29, 3:05 AM EDT | Areal Flood Advisory | CAE | 115 min |
| Jul 29, 2:28 PM EDT | Areal Flood Advisory | CAE | 2 hr |
| Jul 29, 4:23 PM EDT | Areal Flood Advisory | CAE | 112 min |
| Aug 1, 1:23 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 2, 2:18 PM EDT | Special Weather Statement | CAE | 57 min |
| Aug 5, 4:55 PM EDT | Special Weather Statement | CAE | 35 min |
| Aug 6, 3:43 PM EDT | Special Weather Statement | CAE | 47 min |
| Aug 9, 6:10 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 11, 4:35 PM EDT | Special Weather Statement | CAE | 25 min |
| Aug 12, 3:16 PM EDT | Special Weather Statement | CAE | 29 min |
| Aug 12, 11:10 PM EDT | Special Weather Statement | CAE | 50 min |
| Aug 12, 11:33 PM EDT | Areal Flood Advisory | CAE | 117 min |
| Aug 13, 12:03 AM EDT | Special Weather Statement | CAE | 57 min |
| Aug 13, 12:18 AM EDT | Flash Flood Warning | CAE | 117 min |
| Aug 17, 8:38 PM EDT | Special Weather Statement | CAE | 67 min |
| Aug 19, 4:09 PM EDT | Special Weather Statement | CAE | 51 min |
| Sep 12, 4:54 PM EDT | Tropical Storm Watch | CAE | 42 hr |
| Sep 13, 3:30 PM EDT | Flash Flood Watch | CAE | 4 days |
| Sep 13, 4:47 PM EDT | Tropical Storm Warning | CAE | 48 hr |
| Sep 14, 6:16 PM EDT | Special Weather Statement | CAE | 44 min |
| Sep 14, 10:33 PM EDT | Special Weather Statement | CAE | 117 min |
| Sep 15, 8:49 AM EDT | Areal Flood Advisory | CAE | 4 hr |
| Sep 15, 5:24 PM EDT | Lake Wind Advisory | CAE | 15 hr |
| Sep 17, 5:41 PM EDT | Special Weather Statement | CAE | 34 min |
| Sep 17, 6:13 PM EDT | Severe Thunderstorm Warning | CAE | 62 min |
| Sep 26, 3:58 PM EDT | Special Weather Statement | CAE | 62 min |
| Sep 26, 11:52 PM EDT | Special Weather Statement | CAE | 38 min |
| Sep 27, 2:20 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 27, 3:44 PM EDT | Severe Thunderstorm Warning | CAE | 34 min |
| Sep 27, 7:12 PM EDT | Severe Thunderstorm Warning | CAE | 48 min |
| Sep 27, 8:01 PM EDT | Special Weather Statement | CAE | 59 min |
| Sep 27, 8:34 PM EDT | Severe Thunderstorm Warning | CAE | 26 min |
| Sep 27, 10:08 PM EDT | Severe Thunderstorm Warning | CAE | 52 min |
| Oct 7, 5:37 AM EDT | Dense Fog Advisory | CAE | 4 hr |
| Oct 9, 11:01 AM EDT | Tropical Storm Watch | CAE | 18 hr |
| Oct 9, 2:37 PM EDT | Flash Flood Watch | CAE | 48 hr |
| Oct 9, 5:58 PM EDT | Tropical Storm Warning | CAE | 47 hr |
| Oct 10, 1:59 PM EDT | Areal Flood Advisory | CAE | 2 hr |
| Oct 10, 2:33 PM EDT | Areal Flood Advisory | CAE | 117 min |
| Oct 10, 4:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 10, 11:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Oct 10, 11:38 PM EDT | Tornado Watch | SPC | 7 hr |
| Oct 11, 4:34 AM EDT | Mesoscale Discussion | SPC | 56 min |
| Oct 11, 7:24 AM EDT | Areal Flood Advisory | CAE | 2 hr |
| Oct 11, 7:29 AM EDT | Areal Flood Advisory | CAE | 2 hr |
| Oct 11, 5:23 PM EDT | Lake Wind Advisory | CAE | 3 hr |
| Oct 16, 6:28 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 20, 2:22 AM EDT | Lake Wind Advisory | CAE | 36 hr |
| Oct 21, 3:45 AM EDT | Frost Advisory | CAE | 29 hr |
| Nov 2, 3:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Nov 2, 10:25 PM EDT | Lake Wind Advisory | CAE | 5 hr |
| Nov 6, 1:18 AM EST | Dense Fog Advisory | CAE | 6 hr |
| Nov 9, 2:35 PM EST | Freeze Watch | CAE | 17 hr |
| Nov 10, 3:43 AM EST | Freeze Warning | CAE | 29 hr |
| Nov 13, 12:07 AM EST | Areal Flood Advisory | CAE | 113 min |
| Nov 15, 9:06 AM EST | Freeze Warning | CAE | 23 hr |
| Nov 16, 1:04 AM EST | Lake Wind Advisory | CAE | 6 hr |
| Nov 16, 2:40 PM EST | Frost Advisory | CAE | 17 hr |
| Nov 22, 2:34 AM EST | Freeze Warning | CAE | 30 hr |
| Nov 26, 2:17 AM EST | Lake Wind Advisory | CAE | 22 hr |
| Dec 8, 3:00 PM EST | Lake Wind Advisory | CAE | 20 hr |
| Dec 14, 2:42 AM EST | Flash Flood Watch | CAE | 10 hr |
| Dec 20, 2:38 PM EST | Lake Wind Advisory | CAE | 37 hr |
| Dec 21, 5:08 AM EST | Lake Wind Advisory | CAE | 23 hr |
| Dec 21, 5:08 AM EST | Wind Advisory | CAE | 13 hr |
| Dec 28, 1:24 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Dec 30, 10:35 PM EST | Dense Fog Advisory | CAE | 13 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 | 27 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 21 |
| Special Weather Statement | 27 |
| Flooding | |
| Flash Flood Warning | 1 |
| River Flood Warning | 1 |
| Flash Flood Watch | 4 |
| Areal Flood Advisory | 16 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Weather Advisory | 3 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 9 |
| Freeze Watch | 2 |
| Frost Advisory | 4 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Lake Wind Advisory | 24 |
| Wind Advisory | 1 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 10 |
| Tropical | |
| Tropical Storm Warning | 2 |
| Tropical Storm Watch | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.