Alert archive / South Carolina / Union County
Weather alerts in Union County, South Carolina, 2011
218 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Union County and its neighbors
Each county as a circle sized by its count in 2011. Tap one for its archive.
- Alerts
- 218
- Warnings
- 59
- Watches
- 22
- Advisories
- 48
- Busiest month
- June45 alerts
- Busiest day
- June 19, 20119 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 2 tornado warnings covering Union County in 2011 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 28 minutes after it went out.
Union County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 2 | 0% | 2 | 100% | 28 min |
| Severe thunderstorm warnings | 54 | 45 | 17% | 31 | 87% | 20 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Greenville-Spartanburg, SC: tornado warnings | 42 | 11 | 74% | 25 | 96% | 21 min |
| NWS Greenville-Spartanburg, SC: severe thunderstorm warnings | 693 | 551 | 20% | 1,309 | 89% | 26 min |
| NWS Greenville-Spartanburg, SC: flash flood warnings | 31 | 20 | 35% | 46 | 85% | 105 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, 4:40 AM EST | Dense Fog Advisory | GSP | 5 hr |
| Jan 1, 7:59 PM EST | Dense Fog Advisory | GSP | 8 hr |
| Jan 8, 3:32 AM EST | Lake Wind Advisory | GSP | 14 hr |
| Jan 8, 4:20 AM EST | Winter Storm Watch | GSP | 35 hr |
| Jan 9, 3:53 AM EST | Winter Storm Warning | GSP | 53 hr |
| Jan 10, 11:27 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 11, 3:47 AM EST | Winter Weather Advisory | GSP | 56 hr |
| Feb 1, 2:45 PM EST | Lake Wind Advisory | GSP | 27 hr |
| Feb 9, 10:58 AM EST | Winter Weather Advisory | GSP | 16 hr |
| Feb 14, 3:40 AM EST | Lake Wind Advisory | GSP | 14 hr |
| Feb 20, 2:36 PM EST | Fire Weather Watch | GSP | 13 hr |
| Feb 21, 3:50 AM EST | Red Flag Warning | GSP | 14 hr |
| Feb 21, 3:50 AM EST | Lake Wind Advisory | GSP | 15 hr |
| Feb 24, 2:18 PM EST | Lake Wind Advisory | GSP | 28 hr |
| Feb 27, 8:21 PM EST | Lake Wind Advisory | GSP | 23 hr |
| Feb 28, 1:29 PM EST | Tornado Watch | SPC | 7 hr |
| Feb 28, 4:36 PM EST | Mesoscale Discussion | SPC | 84 min |
| Feb 28, 5:30 PM EST | Severe Thunderstorm Warning | GSP | 60 min |
| Mar 5, 3:31 AM EST | Lake Wind Advisory | GSP | 37 hr |
| Mar 9, 2:22 PM EST | Special Weather Statement | GSP | 38 min |
| Mar 9, 3:10 PM EST | Special Weather Statement | GSP | 50 min |
| Mar 10, 4:07 AM EST | Lake Wind Advisory | GSP | 38 hr |
| Mar 23, 2:45 AM EDT | Lake Wind Advisory | GSP | 24 hr |
| Mar 24, 12:41 AM EDT | Special Weather Statement | GSP | 49 min |
| Mar 24, 1:19 AM EDT | Special Weather Statement | GSP | 41 min |
| Mar 28, 3:54 AM EDT | Freeze Watch | GSP | 11 hr |
| Mar 28, 2:51 PM EDT | Freeze Warning | GSP | 18 hr |
| Apr 1, 2:51 PM EDT | Lake Wind Advisory | GSP | 29 hr |
| Apr 3, 2:44 PM EDT | Lake Wind Advisory | GSP | 51 hr |
| Apr 4, 9:45 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Apr 5, 12:42 AM EDT | Severe Thunderstorm Warning | GSP | 63 min |
| Apr 5, 1:35 AM EDT | Severe Thunderstorm Warning | GSP | 55 min |
| Apr 5, 2:21 AM EDT | Severe Thunderstorm Warning | GSP | 54 min |
| Apr 5, 4:08 AM EDT | Frost Advisory | GSP | 29 hr |
| Apr 9, 1:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Apr 9, 2:44 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 9, 5:36 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Apr 9, 6:16 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 9, 7:59 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Apr 9, 8:29 PM EDT | Severe Thunderstorm Warning | GSP | 34 min |
| Apr 9, 8:56 PM EDT | Severe Thunderstorm Warning | GSP | 64 min |
| Apr 12, 1:21 AM EDT | Lake Wind Advisory | GSP | 19 hr |
| Apr 12, 2:39 AM EDT | Mesoscale Discussion | SPC | 36 min |
| Apr 15, 4:10 AM EDT | Lake Wind Advisory | GSP | 36 hr |
| Apr 16, 5:09 AM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 16, 5:57 AM EDT | Tornado Watch | SPC | 8 hr |
| Apr 16, 10:39 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 16, 11:01 AM EDT | Special Weather Statement | GSP | 29 min |
| Apr 16, 3:52 PM EDT | Lake Wind Advisory | GSP | 14 hr |
| Apr 16, 3:52 PM EDT | Wind Advisory | GSP | 4 hr |
| Apr 20, 10:20 AM EDT | Special Weather Statement | GSP | 25 min |
| Apr 26, 5:23 PM EDT | Severe Thunderstorm Warning | GSP | 45 min |
| Apr 27, 3:27 AM EDT | Lake Wind Advisory | GSP | 28 hr |
| Apr 27, 11:57 AM EDT | Severe Thunderstorm Warning | GSP | 33 min |
| Apr 27, 6:41 PM EDT | Mesoscale Discussion | SPC | 34 min |
| Apr 28, 12:56 AM EDT | Tornado Watch | SPC | 4 hr |
| Apr 28, 3:30 AM EDT | Mesoscale Discussion | SPC | 90 min |
| May 3, 4:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| May 3, 7:22 PM EDT | Mesoscale Discussion | SPC | 83 min |
| May 3, 9:16 PM EDT | Special Weather Statement | GSP | 44 min |
| May 8, 8:05 PM EDT | Special Weather Statement | GSP | 40 min |
| May 8, 8:44 PM EDT | Severe Thunderstorm Warning | GSP | 43 min |
| May 10, 2:18 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 10, 3:20 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 10, 6:02 PM EDT | Mesoscale Discussion | SPC | 58 min |
| May 10, 9:01 PM EDT | Mesoscale Discussion | SPC | 59 min |
| May 10, 10:42 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 11, 12:04 AM EDT | Severe Thunderstorm Warning | GSP | 56 min |
| May 11, 12:14 AM EDT | Mesoscale Discussion | SPC | 61 min |
| May 11, 12:51 AM EDT | Severe Thunderstorm Warning | GSP | 54 min |
| May 11, 2:37 AM EDT | Mesoscale Discussion | SPC | 23 min |
| May 12, 4:28 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 13, 4:44 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 13, 7:55 PM EDT | Severe Thunderstorm Warning | GSP | 47 min |
| May 14, 9:14 PM EDT | Special Weather Statement | GSP | 61 min |
| May 14, 10:16 PM EDT | Special Weather Statement | GSP | 59 min |
| May 26, 5:10 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 26, 7:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| May 26, 8:56 PM EDT | Severe Thunderstorm Warning | GSP | 64 min |
| May 26, 9:23 PM EDT | Severe Thunderstorm Warning | GSP | 67 min |
| May 27, 9:11 AM EDT | Special Weather Statement | GSP | 64 min |
| May 27, 10:16 AM EDT | Special Weather Statement | GSP | 44 min |
| May 27, 3:28 PM EDT | Special Weather Statement | GSP | 32 min |
| Jun 2, 2:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jun 2, 4:55 PM EDT | Severe Thunderstorm Warning | GSP | 65 min |
| Jun 2, 5:38 PM EDT | Severe Thunderstorm Warning | GSP | 52 min |
| Jun 2, 6:06 PM EDT | Severe Thunderstorm Warning | GSP | 54 min |
| Jun 2, 6:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 2, 6:53 PM EDT | Severe Thunderstorm Warning | GSP | 52 min |
| Jun 3, 12:43 AM EDT | Special Weather Statement | GSP | 32 min |
| Jun 3, 12:57 AM EDT | Severe Thunderstorm Warning | GSP | 48 min |
| Jun 3, 1:48 AM EDT | Special Weather Statement | GSP | 27 min |
| Jun 3, 2:33 AM EDT | Special Weather Statement | GSP | 27 min |
| Jun 3, 3:38 AM EDT | Special Weather Statement | GSP | 37 min |
| Jun 5, 4:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jun 5, 5:37 PM EDT | Severe Thunderstorm Warning | GSP | 53 min |
| Jun 5, 6:10 PM EDT | Special Weather Statement | GSP | 50 min |
| Jun 5, 6:15 PM EDT | Severe Thunderstorm Warning | GSP | 42 min |
| Jun 5, 8:18 PM EDT | Special Weather Statement | GSP | 42 min |
| Jun 9, 1:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 11, 1:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 11, 11:48 PM EDT | Special Weather Statement | GSP | 27 min |
| Jun 12, 5:38 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jun 12, 5:40 PM EDT | Special Weather Statement | GSP | 50 min |
| Jun 12, 6:08 PM EDT | Severe Thunderstorm Warning | GSP | 67 min |
| Jun 15, 7:08 PM EDT | Severe Thunderstorm Warning | GSP | 67 min |
| Jun 15, 7:35 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 18, 11:05 AM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 18, 4:01 PM EDT | Severe Thunderstorm Warning | GSP | 74 min |
| Jun 19, 4:42 AM EDT | Special Weather Statement | GSP | 48 min |
| Jun 19, 5:01 AM EDT | Severe Thunderstorm Warning | GSP | 59 min |
| Jun 19, 6:08 AM EDT | Severe Thunderstorm Warning | GSP | 67 min |
| Jun 19, 1:29 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Jun 19, 2:22 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 19, 4:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 19, 4:47 PM EDT | Severe Thunderstorm Warning | GSP | 58 min |
| Jun 19, 5:42 PM EDT | Severe Thunderstorm Warning | GSP | 36 min |
| Jun 19, 6:58 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 21, 2:11 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 21, 8:54 PM EDT | Severe Thunderstorm Warning | GSP | 66 min |
| Jun 22, 4:44 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jun 22, 5:38 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 22, 7:39 PM EDT | Severe Thunderstorm Warning | GSP | 66 min |
| Jun 26, 1:36 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 26, 4:14 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Jun 26, 6:29 PM EDT | Mesoscale Discussion | SPC | 46 min |
| Jun 26, 8:24 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jun 27, 4:07 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 3, 4:48 PM EDT | Special Weather Statement | GSP | 42 min |
| Jul 3, 4:56 PM EDT | Severe Thunderstorm Warning | GSP | 64 min |
| Jul 3, 5:31 PM EDT | Severe Thunderstorm Warning | GSP | 59 min |
| Jul 3, 6:00 PM EDT | Special Weather Statement | GSP | 30 min |
| Jul 4, 5:26 PM EDT | Severe Thunderstorm Warning | GSP | 64 min |
| Jul 4, 5:34 PM EDT | Severe Thunderstorm Warning | GSP | 56 min |
| Jul 4, 5:51 PM EDT | Severe Thunderstorm Warning | GSP | 54 min |
| Jul 7, 4:37 PM EDT | Special Weather Statement | GSP | 38 min |
| Jul 7, 4:42 PM EDT | Severe Thunderstorm Warning | GSP | 24 min |
| Jul 8, 1:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 8, 7:06 PM EDT | Special Weather Statement | GSP | 24 min |
| Jul 8, 8:36 PM EDT | Severe Thunderstorm Warning | GSP | 54 min |
| Jul 8, 8:38 PM EDT | Severe Thunderstorm Warning | GSP | 67 min |
| Jul 11, 2:33 PM EDT | Heat Advisory | GSP | 30 hr |
| Jul 12, 2:45 PM EDT | Heat Advisory | GSP | 30 hr |
| Jul 13, 4:41 PM EDT | Severe Thunderstorm Warning | GSP | 64 min |
| Jul 13, 5:25 PM EDT | Severe Thunderstorm Warning | GSP | 65 min |
| Jul 13, 6:28 PM EDT | Special Weather Statement | GSP | 47 min |
| Jul 20, 2:37 PM EDT | Heat Advisory | GSP | 30 hr |
| Jul 21, 2:49 PM EDT | Heat Advisory | GSP | 29 hr |
| Jul 22, 2:53 PM EDT | Heat Advisory | GSP | 29 hr |
| Jul 25, 7:16 PM EDT | Special Weather Statement | GSP | 29 min |
| Jul 25, 7:19 PM EDT | Severe Thunderstorm Warning | GSP | 44 min |
| Jul 25, 7:23 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jul 30, 4:12 AM EDT | Heat Advisory | GSP | 16 hr |
| Jul 30, 2:49 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jul 31, 5:45 PM EDT | Special Weather Statement | GSP | 45 min |
| Jul 31, 6:05 PM EDT | Severe Thunderstorm Warning | GSP | 55 min |
| Aug 3, 2:45 PM EDT | Heat Advisory | GSP | 29 hr |
| Aug 6, 5:21 PM EDT | Special Weather Statement | GSP | 39 min |
| Aug 7, 3:53 AM EDT | Heat Advisory | GSP | 16 hr |
| Aug 7, 6:58 PM EDT | Severe Thunderstorm Warning | GSP | 62 min |
| Aug 7, 7:58 PM EDT | Severe Thunderstorm Warning | GSP | 62 min |
| Aug 8, 6:14 PM EDT | Severe Thunderstorm Warning | GSP | 61 min |
| Aug 9, 10:14 PM EDT | Severe Thunderstorm Warning | GSP | 61 min |
| Aug 11, 2:25 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Aug 11, 4:18 PM EDT | Severe Thunderstorm Warning | GSP | 57 min |
| Aug 11, 5:13 PM EDT | Severe Thunderstorm Warning | GSP | 32 min |
| Aug 12, 11:34 AM EDT | Severe Thunderstorm Warning | GSP | 56 min |
| Aug 12, 12:51 PM EDT | Special Weather Statement | GSP | 39 min |
| Aug 12, 1:46 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 13, 4:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 13, 4:53 PM EDT | Special Weather Statement | GSP | 52 min |
| Aug 13, 4:59 PM EDT | Severe Thunderstorm Warning | GSP | 61 min |
| Aug 13, 5:46 PM EDT | Special Weather Statement | GSP | 44 min |
| Aug 13, 6:09 PM EDT | Severe Thunderstorm Warning | GSP | 66 min |
| Aug 14, 1:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Aug 14, 2:07 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 14, 3:52 PM EDT | Severe Thunderstorm Warning | GSP | 68 min |
| Aug 14, 6:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Aug 21, 1:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Sep 2, 6:55 PM EDT | Severe Thunderstorm Warning | GSP | 52 min |
| Sep 5, 1:23 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Sep 5, 3:42 PM EDT | Tornado Watch | SPC | 7 hr |
| Sep 5, 7:36 PM EDT | Severe Thunderstorm Warning | GSP | 54 min |
| Sep 5, 7:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Sep 6, 8:57 AM EDT | Special Weather Statement | GSP | 48 min |
| Sep 6, 9:50 AM EDT | Special Weather Statement | GSP | 25 min |
| Sep 6, 9:51 AM EDT | Tornado Watch | SPC | 6 hr |
| Sep 15, 2:51 PM EDT | Lake Wind Advisory | GSP | 13 hr |
| Sep 15, 6:59 PM EDT | Special Weather Statement | GSP | 46 min |
| Sep 25, 2:01 PM EDT | Special Weather Statement | GSP | 44 min |
| Sep 25, 2:47 PM EDT | Special Weather Statement | GSP | 43 min |
| Sep 25, 6:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Sep 30, 3:22 PM EDT | Lake Wind Advisory | GSP | 36 hr |
| Oct 13, 2:47 PM EDT | Lake Wind Advisory | GSP | 28 hr |
| Oct 19, 3:40 AM EDT | Lake Wind Advisory | GSP | 39 hr |
| Oct 19, 2:50 PM EDT | Lake Wind Advisory | GSP | 28 hr |
| Oct 21, 2:30 PM EDT | Frost Advisory | GSP | 20 hr |
| Oct 22, 2:55 PM EDT | Frost Advisory | GSP | 18 hr |
| Oct 29, 4:45 AM EDT | Frost Advisory | GSP | 28 hr |
| Oct 30, 2:50 PM EDT | Frost Advisory | GSP | 18 hr |
| Oct 31, 2:24 PM EDT | Frost Advisory | GSP | 19 hr |
| Nov 4, 4:21 AM EDT | Lake Wind Advisory | GSP | 15 hr |
| Nov 16, 1:17 PM EST | Mesoscale Discussion | SPC | 118 min |
| Nov 16, 1:35 PM EST | Tornado Watch | SPC | 7 hr |
| Nov 16, 4:06 PM EST | Mesoscale Discussion | SPC | 114 min |
| Nov 16, 4:36 PM EST | Tornado Warning | GSP | 39 min |
| Nov 16, 5:05 PM EST | Tornado Warning | GSP | 40 min |
| Nov 22, 3:52 AM EST | Dense Fog Advisory | GSP | 4 hr |
| Nov 22, 10:14 PM EST | Mesoscale Discussion | SPC | 61 min |
| Nov 22, 10:41 PM EST | Special Weather Statement | GSP | 34 min |
| Nov 28, 5:22 PM EST | Special Weather Statement | GSP | 38 min |
| Dec 5, 10:39 PM EST | Dense Fog Advisory | GSP | 7 hr |
| Dec 7, 3:39 AM EST | Lake Wind Advisory | GSP | 18 hr |
| Dec 21, 9:24 PM EST | Dense Fog Advisory | GSP | 13 hr |
| Dec 22, 4:13 AM EST | Dense Fog Advisory | GSP | 6 hr |
| Dec 25, 11:55 PM EST | Dense Fog Advisory | GSP | 6 hr |
| Dec 27, 3:29 AM EST | Lake Wind Advisory | GSP | 15 hr |
| Dec 27, 3:29 AM EST | Wind Advisory | GSP | 27 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 | 54 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 12 |
| Tornado Watch | 7 |
| Mesoscale Discussion | 49 |
| Special Weather Statement | 40 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 2 |
| Heat | |
| Heat Advisory | 8 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 6 |
| Wind and dust | |
| Lake Wind Advisory | 23 |
| Wind Advisory | 2 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.