Alert archive / South Carolina / McCormick County
Weather alerts in McCormick County, South Carolina, 2017
140 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
McCormick County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 140
- Warnings
- 39
- Watches
- 14
- Advisories
- 36
- Busiest month
- April27 alerts
- Busiest day
- April 5, 201711 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 McCormick County in 2017 had a tornado report inside them.
McCormick County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 27 | 22 | 19% | 9 | 100% | 23 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Columbia, SC: tornado warnings | 29 | 12 | 59% | 33 | 85% | 11 min |
| NWS Columbia, SC: severe thunderstorm warnings | 205 | 135 | 34% | 331 | 85% | 23 min |
| NWS Columbia, SC: flash flood warnings | 19 | 13 | 32% | 40 | 93% | 36 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, 5:38 AM EST | Areal Flood Advisory | CAE | 112 min |
| Jan 5, 3:19 PM EST | Winter Storm Watch | CAE | 24 hr |
| Jan 5, 3:19 PM EST | Winter Storm Warning | CAE | 39 hr |
| Jan 6, 4:06 AM EST | Winter Weather Advisory | CAE | 26 hr |
| Jan 15, 5:28 AM EST | Dense Fog Advisory | CAE | 5 hr |
| Jan 16, 10:51 PM EST | Dense Fog Advisory | CAE | 11 hr |
| Jan 21, 1:53 AM EST | Dense Fog Advisory | CAE | 9 hr |
| Jan 22, 3:26 AM EST | Lake Wind Advisory | CAE | 43 hr |
| Jan 22, 9:46 PM EST | Mesoscale Discussion | SPC | 89 min |
| Jan 25, 2:16 PM EST | Lake Wind Advisory | CAE | 29 hr |
| Jan 29, 2:50 AM EST | Lake Wind Advisory | CAE | 16 hr |
| Feb 8, 2:32 PM EST | Lake Wind Advisory | CAE | 28 hr |
| Feb 15, 7:59 AM EST | Special Weather Statement | CAE | 46 min |
| Feb 25, 3:56 AM EST | Lake Wind Advisory | CAE | 18 hr |
| Mar 1, 3:11 AM EST | Lake Wind Advisory | CAE | 24 hr |
| Mar 1, 9:14 PM EST | Special Weather Statement | CAE | 91 min |
| Mar 3, 3:13 AM EST | Freeze Warning | CAE | 30 hr |
| Mar 4, 9:09 AM EST | Freeze Warning | CAE | 24 hr |
| Mar 13, 1:36 PM EDT | Freeze Watch | CAE | 14 hr |
| Mar 14, 3:43 AM EDT | Freeze Warning | CAE | 30 hr |
| Mar 14, 3:43 AM EDT | Lake Wind Advisory | CAE | 31 hr |
| Mar 15, 10:28 AM EDT | Freeze Warning | CAE | 24 hr |
| Mar 16, 10:30 AM EDT | Freeze Warning | CAE | 24 hr |
| Mar 21, 7:47 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Mar 21, 8:14 PM EDT | Special Weather Statement | CAE | 31 min |
| Mar 21, 8:35 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Mar 21, 8:58 PM EDT | Special Weather Statement | CAE | 47 min |
| Mar 21, 10:05 PM EDT | Severe Thunderstorm Warning | CAE | 40 min |
| Mar 21, 10:08 PM EDT | Severe Thunderstorm Warning | CAE | 37 min |
| Mar 21, 10:45 PM EDT | Severe Thunderstorm Warning | CAE | 45 min |
| Apr 3, 3:52 AM EDT | Lake Wind Advisory | CAE | 20 hr |
| Apr 3, 10:07 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 3, 12:06 PM EDT | Special Weather Statement | CAE | 24 min |
| Apr 3, 1:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Apr 3, 2:07 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 3, 2:47 PM EDT | Severe Thunderstorm Warning | CAE | 58 min |
| Apr 3, 3:31 PM EDT | Tornado Warning | CAE | 29 min |
| Apr 5, 4:12 AM EDT | Flash Flood Watch | CAE | 16 hr |
| Apr 5, 10:25 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Apr 5, 10:43 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 5, 12:03 PM EDT | Severe Thunderstorm Warning | CAE | 57 min |
| Apr 5, 12:54 PM EDT | Tornado Watch | SPC | 10 hr |
| Apr 5, 12:58 PM EDT | Severe Thunderstorm Warning | CAE | 47 min |
| Apr 5, 2:05 PM EDT | Severe Thunderstorm Warning | CAE | 40 min |
| Apr 5, 2:39 PM EDT | Severe Thunderstorm Warning | CAE | 48 min |
| Apr 5, 2:43 PM EDT | Wind Advisory | CAE | 30 hr |
| Apr 5, 3:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 5, 3:49 PM EDT | River Flood Warning | CAE | 67 hr |
| Apr 5, 11:34 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Apr 5, 11:50 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 6, 12:26 AM EDT | Special Weather Statement | CAE | 64 min |
| Apr 6, 8:46 PM EDT | Lake Wind Advisory | CAE | 24 hr |
| Apr 18, 5:27 PM EDT | Special Weather Statement | CAE | 33 min |
| Apr 23, 10:59 AM EDT | Flash Flood Watch | CAE | 37 hr |
| Apr 23, 2:24 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 27, 1:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Apr 30, 2:22 PM EDT | Lake Wind Advisory | CAE | 30 hr |
| May 1, 1:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| May 1, 2:21 PM EDT | Special Weather Statement | CAE | 24 min |
| May 1, 2:45 PM EDT | Severe Thunderstorm Warning | CAE | 45 min |
| May 1, 3:25 PM EDT | Severe Thunderstorm Warning | CAE | 50 min |
| May 5, 12:08 AM EDT | Special Weather Statement | CAE | 37 min |
| May 22, 11:16 AM EDT | Flash Flood Watch | CAE | 58 hr |
| May 22, 1:48 PM EDT | Flash Flood Warning | CAE | 3 hr |
| May 24, 8:29 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 24, 10:04 AM EDT | Tornado Watch | SPC | 11 hr |
| May 24, 1:21 PM EDT | Severe Thunderstorm Warning | CAE | 39 min |
| May 24, 1:57 PM EDT | Severe Thunderstorm Warning | CAE | 48 min |
| May 24, 2:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| May 24, 2:57 PM EDT | Areal Flood Advisory | CAE | 2 hr |
| May 24, 3:02 PM EDT | Mesoscale Discussion | SPC | 88 min |
| May 24, 5:25 PM EDT | Mesoscale Discussion | SPC | 65 min |
| May 27, 11:16 PM EDT | Mesoscale Discussion | SPC | 89 min |
| May 29, 2:27 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 29, 3:15 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 29, 4:42 PM EDT | Special Weather Statement | CAE | 63 min |
| May 29, 4:51 PM EDT | Severe Thunderstorm Warning | CAE | 54 min |
| May 29, 4:59 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 29, 5:11 PM EDT | Severe Thunderstorm Warning | CAE | 64 min |
| May 29, 5:35 PM EDT | Severe Thunderstorm Warning | CAE | 55 min |
| May 29, 6:12 PM EDT | Severe Thunderstorm Warning | CAE | 63 min |
| May 29, 6:31 PM EDT | Severe Thunderstorm Warning | CAE | 59 min |
| May 29, 7:30 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jun 14, 1:17 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 6:54 PM EDT | Special Weather Statement | CAE | 51 min |
| Jun 30, 4:45 PM EDT | Special Weather Statement | CAE | 45 min |
| Jul 4, 5:32 PM EDT | Special Weather Statement | CAE | 73 min |
| Jul 5, 6:46 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 6, 4:48 PM EDT | Severe Thunderstorm Warning | CAE | 27 min |
| Jul 6, 4:58 PM EDT | Special Weather Statement | CAE | 47 min |
| Jul 6, 5:11 PM EDT | Special Weather Statement | CAE | 49 min |
| Jul 6, 5:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jul 6, 5:23 PM EDT | Severe Thunderstorm Warning | CAE | 52 min |
| Jul 6, 6:14 PM EDT | Severe Thunderstorm Warning | CAE | 26 min |
| Jul 7, 1:30 PM EDT | Special Weather Statement | CAE | 45 min |
| Jul 7, 2:23 PM EDT | Special Weather Statement | CAE | 22 min |
| Jul 7, 2:37 PM EDT | Severe Thunderstorm Warning | CAE | 53 min |
| Jul 8, 7:56 PM EDT | Special Weather Statement | CAE | 34 min |
| Jul 15, 1:38 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jul 15, 6:41 PM EDT | Severe Thunderstorm Warning | CAE | 49 min |
| Jul 16, 5:11 PM EDT | Special Weather Statement | CAE | 49 min |
| Jul 23, 11:36 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 5:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jul 23, 7:41 PM EDT | Severe Thunderstorm Warning | CAE | 64 min |
| Jul 23, 7:53 PM EDT | Severe Thunderstorm Warning | CAE | 67 min |
| Jul 28, 1:34 PM EDT | Special Weather Statement | CAE | 41 min |
| Aug 11, 2:32 PM EDT | Special Weather Statement | CAE | 58 min |
| Aug 28, 2:47 PM EDT | Lake Wind Advisory | CAE | 13 hr |
| Aug 31, 3:26 PM EDT | Severe Thunderstorm Warning | CAE | 64 min |
| Sep 5, 3:36 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Sep 9, 2:52 PM EDT | High Wind Watch | CAE | 24 hr |
| Sep 9, 2:52 PM EDT | Lake Wind Advisory | CAE | 24 hr |
| Sep 10, 4:35 AM EDT | Flash Flood Watch | CAE | 45 hr |
| Sep 10, 3:16 PM EDT | High Wind Warning | CAE | 30 hr |
| Sep 10, 3:16 PM EDT | Wind Advisory | CAE | 30 hr |
| Sep 11, 8:54 PM EDT | Lake Wind Advisory | CAE | 5 hr |
| Oct 8, 2:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 8, 3:56 PM EDT | Severe Thunderstorm Warning | CAE | 37 min |
| Oct 8, 4:04 PM EDT | Tornado Warning | CAE | 17 min |
| Oct 15, 6:11 AM EDT | Dense Fog Advisory | CAE | 4 hr |
| Oct 16, 2:00 PM EDT | Lake Wind Advisory | CAE | 18 hr |
| Oct 23, 1:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Oct 23, 2:00 PM EDT | Tornado Watch | SPC | 8 hr |
| Oct 29, 3:53 AM EDT | Lake Wind Advisory | CAE | 22 hr |
| Nov 4, 11:42 PM EDT | Dense Fog Advisory | CAE | 10 hr |
| Nov 5, 9:53 PM EST | Dense Fog Advisory | CAE | 12 hr |
| Nov 7, 6:29 AM EST | Dense Fog Advisory | CAE | 2 hr |
| Nov 7, 4:30 PM EST | Special Weather Statement | CAE | 45 min |
| Nov 7, 4:42 PM EST | Severe Thunderstorm Warning | CAE | 48 min |
| Nov 10, 7:06 PM EST | Lake Wind Advisory | CAE | 18 hr |
| Nov 13, 8:21 AM EST | Dense Fog Advisory | CAE | 3 hr |
| Nov 18, 7:01 PM EST | Lake Wind Advisory | CAE | 12 hr |
| Nov 19, 1:34 PM EST | Freeze Warning | CAE | 19 hr |
| Nov 22, 1:37 AM EST | Dense Fog Advisory | CAE | 8 hr |
| Nov 30, 4:27 AM EST | Dense Fog Advisory | CAE | 6 hr |
| Dec 1, 5:49 AM EST | Dense Fog Advisory | CAE | 5 hr |
| Dec 12, 4:19 AM EST | Lake Wind Advisory | CAE | 24 hr |
| Dec 20, 12:58 PM EST | Special Weather Statement | CAE | 62 min |
| Dec 23, 3:14 AM EST | Lake Wind Advisory | CAE | 15 hr |
| Dec 24, 12:01 PM EST | Lake Wind Advisory | CAE | 19 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 | 2 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 4 |
| Mesoscale Discussion | 28 |
| Special Weather Statement | 23 |
| Flooding | |
| Flash Flood Warning | 1 |
| River Flood Warning | 1 |
| Flash Flood Watch | 4 |
| Areal Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 1 |
| Cold | |
| Freeze Warning | 6 |
| Freeze Watch | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Lake Wind Advisory | 20 |
| Wind Advisory | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 11 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.