Alert archive / South Carolina / Sumter County
Weather alerts in Sumter County, South Carolina, 2016
144 weather alerts in 2016, 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 2016. Tap one for its archive.
- Alerts
- 144
- Warnings
- 50
- Watches
- 10
- Advisories
- 39
- Busiest month
- July38 alerts
- Busiest day
- June 17, 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 2 tornado warnings covering Sumter County in 2016 had a tornado report inside them.
Sumter County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 37 | 34 | 8% | 25 | 88% | 24 min |
| Flash flood warnings | 4 | 4 | 0% | 7 | 100% | 106 min |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Columbia, SC: tornado warnings | 6 | 1 | 83% | 2 | 50% | 13 min |
| NWS Columbia, SC: severe thunderstorm warnings | 192 | 163 | 15% | 324 | 87% | 21 min |
| NWS Columbia, SC: flash flood warnings | 14 | 12 | 14% | 45 | 96% | 71 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 4, 2:38 AM EST | Lake Wind Advisory | CAE | 31 hr |
| Jan 10, 2:34 AM EST | Lake Wind Advisory | CAE | 21 hr |
| Jan 12, 2:19 AM EST | Lake Wind Advisory | CAE | 20 hr |
| Jan 15, 5:05 PM EST | Special Weather Statement | CAE | 85 min |
| Jan 21, 4:30 AM EST | Freezing Rain Advisory | CAE | 37 hr |
| Jan 22, 5:41 PM EST | Winter Weather Advisory | CAE | 19 hr |
| Feb 3, 1:56 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Feb 3, 2:27 PM EST | Severe Thunderstorm Warning | CAE | 63 min |
| Feb 3, 2:55 PM EST | Tornado Warning | CAE | 65 min |
| Feb 6, 4:18 AM EST | Lake Wind Advisory | CAE | 38 hr |
| Feb 9, 2:11 AM EST | Lake Wind Advisory | CAE | 43 hr |
| Feb 16, 3:22 AM EST | Special Weather Statement | CAE | 23 min |
| Feb 22, 12:37 PM EST | Areal Flood Advisory | CAE | 113 min |
| Feb 23, 12:39 PM EST | Wind Advisory | CAE | 39 hr |
| Feb 24, 11:16 AM EST | Tornado Watch | SPC | 8 hr |
| Feb 24, 2:55 PM EST | Mesoscale Discussion | SPC | 95 min |
| Feb 25, 3:55 AM EST | Lake Wind Advisory | CAE | 18 hr |
| Mar 1, 11:40 PM EST | Mesoscale Discussion | SPC | 65 min |
| Mar 21, 4:12 AM EDT | Frost Advisory | CAE | 29 hr |
| Mar 27, 7:38 PM EDT | Areal Flood Advisory | CAE | 2 hr |
| Apr 1, 11:40 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 1, 4:29 PM EDT | Severe Thunderstorm Warning | CAE | 61 min |
| Apr 2, 3:17 AM EDT | Lake Wind Advisory | CAE | 27 hr |
| Apr 5, 3:27 AM EDT | Frost Advisory | CAE | 29 hr |
| Apr 6, 6:31 PM EDT | Lake Wind Advisory | CAE | 7 hr |
| Apr 7, 1:49 AM EDT | Wind Advisory | CAE | 8 hr |
| Apr 7, 3:39 AM EDT | Special Weather Statement | CAE | 21 min |
| Apr 7, 4:05 AM EDT | Special Weather Statement | CAE | 25 min |
| Apr 7, 4:22 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 7, 4:36 AM EDT | Special Weather Statement | CAE | 39 min |
| Apr 7, 9:54 AM EDT | Lake Wind Advisory | CAE | 10 hr |
| Apr 8, 4:03 AM EDT | Freeze Watch | CAE | 24 hr |
| Apr 8, 4:03 AM EDT | Lake Wind Advisory | CAE | 16 hr |
| Apr 9, 4:06 AM EDT | Freeze Warning | CAE | 29 hr |
| Apr 9, 4:06 AM EDT | Lake Wind Advisory | CAE | 15 hr |
| Apr 22, 5:22 PM EDT | Special Weather Statement | CAE | 23 min |
| Apr 30, 4:09 AM EDT | Dense Fog Advisory | CAE | 5 hr |
| May 1, 1:45 PM EDT | Special Weather Statement | CAE | 60 min |
| May 2, 2:23 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 3, 3:17 AM EDT | Special Weather Statement | CAE | 28 min |
| May 3, 2:52 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 12, 1:40 PM EDT | Severe Thunderstorm Warning | CAE | 35 min |
| May 12, 2:04 PM EDT | Special Weather Statement | CAE | 26 min |
| May 12, 2:16 PM EDT | Severe Thunderstorm Warning | CAE | 44 min |
| Jun 2, 8:37 PM EDT | Special Weather Statement | CAE | 53 min |
| Jun 2, 8:52 PM EDT | Severe Thunderstorm Warning | CAE | 38 min |
| Jun 3, 5:01 PM EDT | Special Weather Statement | CAE | 59 min |
| Jun 5, 7:11 PM EDT | Special Weather Statement | CAE | 64 min |
| Jun 6, 3:11 PM EDT | Flash Flood Watch | CAE | 13 hr |
| Jun 14, 1:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 14, 4:13 PM EDT | Severe Thunderstorm Warning | CAE | 47 min |
| Jun 15, 1:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 15, 1:46 PM EDT | Special Weather Statement | CAE | 59 min |
| Jun 15, 2:23 PM EDT | Severe Thunderstorm Warning | CAE | 52 min |
| Jun 16, 2:54 PM EDT | Special Weather Statement | CAE | 36 min |
| Jun 17, 12:59 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 1:18 PM EDT | Special Weather Statement | CAE | 57 min |
| Jun 17, 1:25 PM EDT | Severe Thunderstorm Warning | CAE | 50 min |
| Jun 17, 1:43 PM EDT | Severe Thunderstorm Warning | CAE | 47 min |
| Jun 17, 1:52 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 17, 2:07 PM EDT | Severe Thunderstorm Warning | CAE | 38 min |
| Jun 17, 2:15 PM EDT | Severe Thunderstorm Warning | CAE | 60 min |
| Jun 17, 2:45 PM EDT | Severe Thunderstorm Warning | CAE | 30 min |
| Jun 24, 3:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 4:50 PM EDT | Severe Thunderstorm Warning | CAE | 25 min |
| Jun 24, 5:08 PM EDT | Severe Thunderstorm Warning | CAE | 67 min |
| Jun 24, 5:25 PM EDT | Severe Thunderstorm Warning | CAE | 80 min |
| Jun 25, 4:10 PM EDT | Severe Thunderstorm Warning | CAE | 50 min |
| Jul 3, 1:36 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 3, 2:40 PM EDT | Special Weather Statement | CAE | 50 min |
| Jul 3, 9:43 PM EDT | Special Weather Statement | CAE | 62 min |
| Jul 5, 5:05 PM EDT | Severe Thunderstorm Warning | CAE | 55 min |
| Jul 5, 5:45 PM EDT | Severe Thunderstorm Warning | CAE | 75 min |
| Jul 6, 1:53 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 6, 4:09 PM EDT | Special Weather Statement | CAE | 51 min |
| Jul 6, 4:15 PM EDT | Severe Thunderstorm Warning | CAE | 60 min |
| Jul 6, 4:52 PM EDT | Severe Thunderstorm Warning | CAE | 23 min |
| Jul 7, 4:04 PM EDT | Severe Thunderstorm Warning | CAE | 26 min |
| 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, 8:56 PM EDT | Severe Thunderstorm Warning | CAE | 64 min |
| Jul 7, 9:56 PM EDT | Severe Thunderstorm Warning | CAE | 34 min |
| Jul 7, 10:00 PM EDT | Severe Thunderstorm Warning | CAE | 45 min |
| Jul 7, 10:42 PM EDT | Severe Thunderstorm Warning | CAE | 48 min |
| Jul 8, 9:53 PM EDT | Mesoscale Discussion | SPC | 37 min |
| Jul 8, 11:46 PM EDT | Severe Thunderstorm Warning | CAE | 29 min |
| Jul 8, 11:52 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Jul 9, 12:15 AM EDT | Severe Thunderstorm Warning | CAE | 45 min |
| Jul 10, 2:28 PM EDT | Special Weather Statement | CAE | 32 min |
| Jul 10, 2:40 PM EDT | Severe Thunderstorm Warning | CAE | 50 min |
| Jul 10, 3:42 PM EDT | Severe Thunderstorm Warning | CAE | 48 min |
| Jul 11, 1:46 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 11, 7:54 PM EDT | Special Weather Statement | CAE | 66 min |
| Jul 13, 4:26 PM EDT | Special Weather Statement | CAE | 64 min |
| Jul 14, 12:17 PM EDT | Severe Thunderstorm Warning | CAE | 43 min |
| Jul 14, 1:36 PM EDT | Severe Thunderstorm Warning | CAE | 39 min |
| Jul 15, 1:28 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 1:56 PM EDT | Severe Thunderstorm Warning | CAE | 49 min |
| Jul 15, 2:49 PM EDT | Special Weather Statement | CAE | 26 min |
| Jul 15, 3:16 PM EDT | Special Weather Statement | CAE | 59 min |
| Jul 15, 11:01 PM EDT | Special Weather Statement | CAE | 59 min |
| Jul 19, 3:52 PM EDT | Severe Thunderstorm Warning | CAE | 53 min |
| Jul 19, 4:14 PM EDT | Severe Thunderstorm Warning | CAE | 46 min |
| Jul 21, 1:26 PM EDT | Severe Thunderstorm Warning | CAE | 64 min |
| Jul 21, 1:52 PM EDT | Areal Flood Advisory | CAE | 113 min |
| Jul 31, 1:49 PM EDT | Special Weather Statement | CAE | 41 min |
| Aug 1, 10:03 PM EDT | Special Weather Statement | CAE | 42 min |
| Aug 18, 3:01 PM EDT | Areal Flood Advisory | CAE | 59 min |
| Aug 18, 3:35 PM EDT | Severe Thunderstorm Warning | CAE | 40 min |
| Aug 18, 4:09 PM EDT | Areal Flood Advisory | CAE | 111 min |
| Aug 31, 4:14 PM EDT | Special Weather Statement | CAE | 46 min |
| Sep 1, 3:26 AM EDT | Flash Flood Watch | CAE | 41 hr |
| Sep 1, 9:43 AM EDT | High Wind Watch | CAE | 11 hr |
| Sep 1, 9:05 PM EDT | High Wind Warning | CAE | 25 hr |
| Sep 2, 12:31 AM EDT | Areal Flood Advisory | CAE | 119 min |
| Sep 2, 12:55 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 2, 12:58 PM EDT | Tornado Warning | CAE | 23 min |
| Sep 2, 1:24 PM EDT | Areal Flood Advisory | CAE | 111 min |
| Sep 2, 3:07 PM EDT | Flash Flood Warning | CAE | 3 hr |
| Sep 2, 5:49 PM EDT | Flash Flood Warning | CAE | 3 hr |
| Sep 2, 8:43 PM EDT | Areal Flood Warning | CAE | 9 hr |
| Sep 28, 2:13 PM EDT | Severe Thunderstorm Warning | CAE | 26 min |
| Oct 6, 2:39 PM EDT | Wind Advisory | CAE | 57 hr |
| Oct 6, 2:47 PM EDT | Flash Flood Watch | CAE | 53 hr |
| Oct 7, 12:00 PM EDT | High Wind Warning | CAE | 25 hr |
| Oct 8, 12:27 AM EDT | Areal Flood Advisory | CAE | 6 hr |
| Oct 8, 2:56 AM EDT | Flash Flood Warning | CAE | 6 hr |
| Oct 8, 3:09 AM EDT | Areal Flood Advisory | CAE | 4 hr |
| Oct 8, 8:10 AM EDT | Areal Flood Warning | CAE | 3 hr |
| Oct 8, 8:19 AM EDT | Flash Flood Warning | CAE | 6 hr |
| Oct 8, 11:11 AM EDT | Areal Flood Warning | CAE | 2 hr |
| Oct 21, 3:28 AM EDT | Lake Wind Advisory | CAE | 29 hr |
| Nov 9, 2:29 PM EST | Lake Wind Advisory | CAE | 10 hr |
| Nov 11, 2:27 PM EST | Lake Wind Advisory | CAE | 22 hr |
| Nov 19, 3:13 AM EST | Lake Wind Advisory | CAE | 26 hr |
| Nov 20, 2:51 AM EST | Freeze Warning | CAE | 30 hr |
| Nov 29, 3:58 AM EST | Lake Wind Advisory | CAE | 13 hr |
| Nov 30, 5:43 PM EST | Mesoscale Discussion | SPC | 92 min |
| Dec 12, 9:02 PM EST | Dense Fog Advisory | CAE | 7 hr |
| Dec 13, 5:11 PM EST | Dense Fog Advisory | CAE | 12 hr |
| Dec 21, 3:35 AM EST | Freezing Fog Advisory | CAE | 5 hr |
| Dec 21, 8:40 AM EST | Dense Fog Advisory | CAE | 3 hr |
| Dec 27, 8:00 AM EST | Dense Fog Advisory | CAE | 2 hr |
| Dec 29, 2:44 AM EST | Lake Wind Advisory | CAE | 37 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
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.