Alert archive / South Carolina / Edgefield County
Weather alerts in Edgefield County, South Carolina, 2021
110 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Edgefield County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 110
- Warnings
- 20
- Watches
- 12
- Advisories
- 49
- Busiest month
- August19 alerts
- Busiest day
- August 17, 202110 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 4 tornado warnings covering Edgefield County in 2021 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 21 minutes after it went out.
Edgefield County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 1 | 75% | 2 | 100% | 21 min |
| Severe thunderstorm warnings | 8 | 6 | 25% | 3 | 67% | 6 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Columbia, SC: tornado warnings | 17 | 5 | 71% | 15 | 87% | 10 min |
| NWS Columbia, SC: severe thunderstorm warnings | 80 | 50 | 38% | 156 | 76% | 16 min |
| NWS Columbia, SC: flash flood warnings | 6 | 3 | 50% | 11 | 82% | 32 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 |
|---|---|---|---|
| Dec 31, 10:10 PM EST | Dense Fog Advisory | CAE | 10 hr |
| Jan 1, 12:42 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Jan 1, 3:27 PM EST | Tornado Watch | SPC | 5 hr |
| Jan 1, 3:35 PM EST | Flash Flood Watch | CAE | 34 hr |
| Jan 1, 4:27 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Jan 1, 5:28 PM EST | Tornado Warning | CAE | 32 min |
| Jan 1, 6:34 PM EST | Areal Flood Advisory | CAE | 3 hr |
| Jan 2, 2:16 AM EST | River Flood Warning | CAE | 19 hr |
| Jan 2, 5:10 AM EST | Dense Fog Advisory | CAE | 6 hr |
| Jan 13, 3:25 AM EST | Dense Fog Advisory | CAE | 9 hr |
| Jan 15, 12:41 PM EST | Lake Wind Advisory | CAE | 29 hr |
| Jan 28, 12:53 AM EST | Lake Wind Advisory | CAE | 11 hr |
| Feb 11, 3:18 AM EST | Dense Fog Advisory | CAE | 8 hr |
| Feb 11, 10:53 PM EST | Dense Fog Advisory | CAE | 6 hr |
| Feb 14, 4:04 AM EST | River Flood Warning | CAE | 6 hr |
| Feb 17, 2:01 PM EST | Flash Flood Watch | CAE | 41 hr |
| Feb 18, 7:03 PM EST | River Flood Warning | CAE | 35 hr |
| Mar 16, 11:35 PM EDT | Areal Flood Advisory | CAE | 115 min |
| Mar 17, 6:21 AM EDT | River Flood Warning | CAE | 18 hr |
| Mar 18, 2:08 PM EDT | Tornado Watch | SPC | 4 hr |
| Mar 26, 1:56 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Mar 27, 2:40 PM EDT | Lake Wind Advisory | CAE | 36 hr |
| Mar 28, 12:38 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 28, 2:06 PM EDT | Special Weather Statement | CAE | 39 min |
| Mar 28, 2:45 PM EDT | Special Weather Statement | CAE | 60 min |
| Mar 31, 2:11 PM EDT | Freeze Watch | CAE | 13 hr |
| Mar 31, 2:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Mar 31, 5:05 PM EDT | Special Weather Statement | CAE | 40 min |
| Mar 31, 5:19 PM EDT | Severe Thunderstorm Warning | CAE | 41 min |
| Mar 31, 5:39 PM EDT | Severe Thunderstorm Warning | CAE | 51 min |
| Apr 1, 3:02 AM EDT | Freeze Warning | CAE | 30 hr |
| Apr 2, 9:05 AM EDT | Freeze Warning | CAE | 24 hr |
| Apr 3, 2:36 PM EDT | Frost Advisory | CAE | 17 hr |
| Apr 20, 2:02 PM EDT | Fire Weather Watch | CAE | 12 hr |
| Apr 21, 1:17 AM EDT | Lake Wind Advisory | CAE | 31 hr |
| Apr 21, 1:37 AM EDT | Red Flag Warning | CAE | 18 hr |
| Apr 21, 2:25 PM EDT | Frost Advisory | CAE | 18 hr |
| Apr 22, 2:19 PM EDT | Frost Advisory | CAE | 18 hr |
| Apr 24, 10:29 PM EDT | Special Weather Statement | CAE | 61 min |
| May 3, 1:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 3, 1:25 PM EDT | Tornado Watch | SPC | 6 hr |
| May 3, 4:26 PM EDT | Mesoscale Discussion | SPC | 94 min |
| May 4, 4:16 PM EDT | Mesoscale Discussion | SPC | 119 min |
| May 4, 4:38 PM EDT | Severe Thunderstorm Warning | CAE | 53 min |
| May 4, 4:56 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 7, 3:09 AM EDT | Lake Wind Advisory | CAE | 17 hr |
| May 9, 4:08 AM EDT | Lake Wind Advisory | CAE | 15 hr |
| Jun 6, 6:43 PM EDT | Special Weather Statement | CAE | 32 min |
| Jun 6, 7:11 PM EDT | Areal Flood Advisory | CAE | 78 min |
| Jun 10, 6:50 PM EDT | Special Weather Statement | CAE | 25 min |
| Jun 12, 1:14 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 12, 2:53 PM EDT | Special Weather Statement | CAE | 52 min |
| Jun 15, 12:57 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Jun 20, 2:03 AM EDT | Flash Flood Watch | CAE | 17 hr |
| Jun 20, 1:18 PM EDT | Special Weather Statement | CAE | 42 min |
| Jun 28, 11:34 AM EDT | Lake Wind Advisory | CAE | 16 hr |
| Jul 12, 5:54 PM EDT | Special Weather Statement | CAE | 36 min |
| Jul 16, 2:02 PM EDT | Special Weather Statement | CAE | 28 min |
| Jul 18, 8:31 PM EDT | Severe Thunderstorm Warning | CAE | 44 min |
| Jul 18, 8:57 PM EDT | Areal Flood Advisory | CAE | 2 hr |
| Jul 19, 2:18 PM EDT | Areal Flood Advisory | CAE | 57 min |
| Jul 19, 9:02 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Jul 19, 11:39 PM EDT | Areal Flood Advisory | CAE | 111 min |
| Jul 20, 9:16 AM EDT | Areal Flood Advisory | CAE | 3 hr |
| Jul 20, 1:18 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Jul 20, 4:05 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Jul 20, 5:07 PM EDT | Areal Flood Advisory | CAE | 3 hr |
| Jul 29, 2:44 PM EDT | Heat Advisory | CAE | 29 hr |
| Aug 3, 7:37 AM EDT | Areal Flood Advisory | CAE | 113 min |
| Aug 10, 3:54 PM EDT | Special Weather Statement | CAE | 51 min |
| Aug 10, 4:30 PM EDT | Severe Thunderstorm Warning | CAE | 45 min |
| Aug 14, 3:07 PM EDT | Special Weather Statement | CAE | 23 min |
| Aug 16, 5:29 PM EDT | Areal Flood Advisory | CAE | 2 hr |
| Aug 17, 8:22 AM EDT | Mesoscale Discussion | SPC | 113 min |
| Aug 17, 10:42 AM EDT | Tornado Watch | SPC | 8 hr |
| Aug 17, 12:31 PM EDT | Areal Flood Advisory | CAE | 59 min |
| Aug 17, 12:35 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Aug 17, 12:59 PM EDT | Tornado Warning | CAE | 46 min |
| Aug 17, 1:34 PM EDT | Areal Flood Advisory | CAE | 56 min |
| Aug 17, 1:44 PM EDT | Tornado Warning | CAE | 17 min |
| Aug 17, 1:55 PM EDT | Tornado Warning | CAE | 50 min |
| Aug 17, 3:17 PM EDT | Areal Flood Advisory | CAE | 58 min |
| Aug 17, 5:55 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Aug 23, 3:45 AM EDT | Dense Fog Advisory | CAE | 5 hr |
| Aug 27, 6:47 PM EDT | Special Weather Statement | CAE | 28 min |
| Aug 31, 2:21 PM EDT | Severe Thunderstorm Warning | CAE | 39 min |
| Aug 31, 2:59 PM EDT | Severe Thunderstorm Warning | CAE | 46 min |
| Sep 8, 2:23 PM EDT | Areal Flood Advisory | CAE | 112 min |
| Sep 16, 4:28 PM EDT | Areal Flood Advisory | CAE | 2 hr |
| Sep 22, 2:44 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Oct 7, 11:09 AM EDT | Areal Flood Advisory | CAE | 4 hr |
| Oct 7, 12:30 PM EDT | Areal Flood Advisory | CAE | 2 hr |
| Oct 8, 5:41 AM EDT | Flash Flood Watch | CAE | 6 hr |
| Oct 16, 4:06 AM EDT | Lake Wind Advisory | CAE | 28 hr |
| Oct 25, 8:09 PM EDT | Special Weather Statement | CAE | 51 min |
| Nov 5, 2:27 PM EDT | Lake Wind Advisory | CAE | 45 hr |
| Nov 13, 3:40 AM EST | Freeze Watch | CAE | 7 hr |
| Nov 13, 10:44 AM EST | Freeze Warning | CAE | 21 hr |
| Nov 22, 4:20 PM EST | Lake Wind Advisory | CAE | 15 hr |
| Dec 5, 3:27 AM EST | Dense Fog Advisory | CAE | 7 hr |
| Dec 6, 1:33 AM EST | Dense Fog Advisory | CAE | 7 hr |
| Dec 8, 10:10 PM EST | Dense Fog Advisory | CAE | 11 hr |
| Dec 10, 7:35 PM EST | Dense Fog Advisory | CAE | 13 hr |
| Dec 16, 9:33 PM EST | Dense Fog Advisory | CAE | 12 hr |
| Dec 17, 9:36 PM EST | Dense Fog Advisory | CAE | 12 hr |
| Dec 18, 5:42 PM EST | Special Weather Statement | CAE | 48 min |
| Dec 24, 8:18 PM EST | Lake Wind Advisory | CAE | 23 hr |
| Dec 27, 3:29 AM EST | Dense Fog Advisory | CAE | 7 hr |
| Dec 30, 1:12 PM EST | Severe Thunderstorm Warning | CAE | 22 min |
| Dec 31, 6:51 AM EST | Dense Fog Advisory | CAE | 2 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 | 8 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 14 |
| Special Weather Statement | 15 |
| Flooding | |
| River Flood Warning | 4 |
| Flash Flood Watch | 4 |
| Areal Flood Advisory | 20 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 2 |
| Frost Advisory | 3 |
| Wind and dust | |
| Lake Wind Advisory | 11 |
| 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 archive20202022
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.