Alert archive / North Carolina / Union County
Weather alerts in Union County, North Carolina, 2020
204 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 204
- Warnings
- 41
- Watches
- 12
- Advisories
- 44
- Busiest month
- May47 alerts
- Busiest day
- July 18, 202010 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 Union County in 2020 had a tornado report inside them.
Union County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 1 | 75% | 0 | ||
| Severe thunderstorm warnings | 29 | 14 | 52% | 12 | 75% | 16 min |
| Flash flood warnings | 3 | 1 | 67% | 1 | 100% | 254 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Greenville-Spartanburg, SC: tornado warnings | 61 | 13 | 79% | 25 | 72% | 14 min |
| NWS Greenville-Spartanburg, SC: severe thunderstorm warnings | 325 | 183 | 44% | 520 | 75% | 21 min |
| NWS Greenville-Spartanburg, SC: flash flood warnings | 79 | 42 | 47% | 138 | 71% | 121 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, 5:39 PM EST | Special Weather Statement | GSP | 36 min |
| Jan 11, 5:38 PM EST | Tornado Watch | SPC | 6 hr |
| Jan 11, 8:40 PM EST | Mesoscale Discussion | SPC | 95 min |
| Jan 11, 9:55 PM EST | Severe Thunderstorm Warning | GSP | 65 min |
| Jan 11, 10:31 PM EST | Tornado Warning | GSP | 17 min |
| Jan 13, 10:33 AM EST | Areal Flood Advisory | GSP | 6 hr |
| Jan 14, 4:53 AM EST | Dense Fog Advisory | GSP | 5 hr |
| Jan 15, 3:49 AM EST | Dense Fog Advisory | GSP | 6 hr |
| Feb 5, 4:20 AM EST | Flash Flood Watch | GSP | 44 hr |
| Feb 6, 9:50 AM EST | Mesoscale Discussion | SPC | 55 min |
| Feb 6, 10:12 AM EST | Tornado Watch | SPC | 7 hr |
| Feb 6, 12:02 PM EST | Severe Thunderstorm Warning | GSP | 43 min |
| Feb 6, 12:11 PM EST | Areal Flood Advisory | GSP | 3 hr |
| Feb 6, 12:12 PM EST | Tornado Warning | GSP | 33 min |
| Feb 6, 1:08 PM EST | Mesoscale Discussion | SPC | 97 min |
| Feb 6, 1:54 PM EST | Flash Flood Warning | GSP | 6 hr |
| Feb 6, 8:13 PM EST | Areal Flood Warning | GSP | 6 hr |
| Feb 6, 9:47 PM EST | Wind Advisory | GSP | 20 hr |
| Feb 13, 9:47 AM EST | Severe Thunderstorm Warning | GSP | 43 min |
| Feb 13, 10:26 AM EST | Special Weather Statement | GSP | 49 min |
| Feb 13, 10:29 AM EST | Mesoscale Discussion | SPC | 61 min |
| Feb 17, 4:22 AM EST | Dense Fog Advisory | GSP | 5 hr |
| Feb 19, 3:11 PM EST | Winter Weather Advisory | GSP | 33 hr |
| Feb 26, 3:51 AM EST | Dense Fog Advisory | GSP | 6 hr |
| Mar 18, 2:29 AM EDT | Dense Fog Advisory | GSP | 9 hr |
| Apr 8, 6:12 PM EDT | Severe Thunderstorm Warning | GSP | 48 min |
| Apr 8, 6:56 PM EDT | Special Weather Statement | GSP | 19 min |
| Apr 8, 8:15 PM EDT | Special Weather Statement | CAE | 45 min |
| Apr 8, 8:41 PM EDT | Special Weather Statement | GSP | 34 min |
| Apr 8, 8:49 PM EDT | Special Weather Statement | GSP | 41 min |
| Apr 8, 8:56 PM EDT | Severe Thunderstorm Warning | GSP | 49 min |
| Apr 8, 9:21 PM EDT | Areal Flood Advisory | GSP | 114 min |
| Apr 8, 9:42 PM EDT | Special Weather Statement | GSP | 33 min |
| Apr 9, 6:04 AM EDT | Special Weather Statement | CAE | 41 min |
| Apr 9, 6:09 AM EDT | Special Weather Statement | GSP | 51 min |
| Apr 9, 6:26 AM EDT | Severe Thunderstorm Warning | GSP | 34 min |
| Apr 9, 8:28 PM EDT | Red Flag Warning | GSP | 24 hr |
| Apr 10, 2:58 PM EDT | Frost Advisory | GSP | 18 hr |
| Apr 12, 3:56 AM EDT | Wind Advisory | GSP | 36 hr |
| Apr 12, 11:17 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Apr 13, 1:51 AM EDT | Tornado Watch | SPC | 6 hr |
| Apr 13, 2:39 AM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 13, 5:10 AM EDT | Severe Thunderstorm Warning | GSP | 50 min |
| Apr 13, 5:48 AM EDT | Severe Thunderstorm Warning | GSP | 42 min |
| Apr 15, 3:46 AM EDT | Frost Advisory | GSP | 28 hr |
| Apr 16, 2:50 PM EDT | Frost Advisory | GSP | 17 hr |
| Apr 25, 8:58 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Apr 25, 10:22 PM EDT | Tornado Warning | GSP | 23 min |
| Apr 25, 10:59 PM EDT | Severe Thunderstorm Warning | GSP | 46 min |
| Apr 30, 2:25 AM EDT | Areal Flood Advisory | GSP | 4 hr |
| Apr 30, 2:47 AM EDT | Special Weather Statement | GSP | 28 min |
| Apr 30, 3:14 AM EDT | Special Weather Statement | GSP | 31 min |
| Apr 30, 3:45 AM EDT | Special Weather Statement | GSP | 30 min |
| Apr 30, 6:43 AM EDT | Areal Flood Advisory | GSP | 2 hr |
| May 4, 11:14 PM EDT | Special Weather Statement | GSP | 31 min |
| May 4, 11:43 PM EDT | Special Weather Statement | GSP | 32 min |
| May 5, 3:57 AM EDT | Severe Thunderstorm Warning | GSP | 48 min |
| May 5, 4:33 AM EDT | Severe Thunderstorm Warning | GSP | 27 min |
| May 5, 3:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 5, 3:53 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 5, 7:08 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 6, 4:56 PM EDT | Special Weather Statement | GSP | 49 min |
| May 6, 5:13 PM EDT | Special Weather Statement | CAE | 32 min |
| May 6, 6:09 PM EDT | Special Weather Statement | GSP | 36 min |
| May 9, 11:10 AM EDT | Frost Advisory | GSP | 23 hr |
| May 18, 2:51 PM EDT | Flash Flood Watch | GSP | 3 days |
| May 18, 9:19 PM EDT | Special Weather Statement | GSP | 41 min |
| May 18, 10:38 PM EDT | Special Weather Statement | GSP | 52 min |
| May 18, 11:44 PM EDT | Areal Flood Advisory | GSP | 6 hr |
| May 19, 1:44 AM EDT | Special Weather Statement | GSP | 46 min |
| May 19, 1:04 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 21, 1:12 PM EDT | Severe Thunderstorm Warning | GSP | 33 min |
| May 21, 1:39 PM EDT | Severe Thunderstorm Warning | GSP | 51 min |
| May 21, 2:02 PM EDT | Areal Flood Warning | GSP | 3 hr |
| May 21, 2:40 PM EDT | Special Weather Statement | GSP | 35 min |
| May 21, 4:53 PM EDT | Areal Flood Advisory | GSP | 3 hr |
| May 22, 4:46 AM EDT | Dense Fog Advisory | GSP | 5 hr |
| May 22, 12:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| May 22, 1:18 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 22, 3:49 PM EDT | Mesoscale Discussion | SPC | 86 min |
| May 22, 3:51 PM EDT | Severe Thunderstorm Warning | GSP | 24 min |
| May 22, 4:12 PM EDT | Severe Thunderstorm Warning | GSP | 33 min |
| May 22, 4:30 PM EDT | Severe Thunderstorm Warning | GSP | 30 min |
| May 22, 5:28 PM EDT | Areal Flood Advisory | GSP | 3 hr |
| May 23, 2:55 AM EDT | Dense Fog Advisory | GSP | 6 hr |
| May 24, 1:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 24, 3:33 PM EDT | Special Weather Statement | GSP | 27 min |
| May 24, 3:58 PM EDT | Special Weather Statement | GSP | 32 min |
| May 24, 4:42 PM EDT | Severe Thunderstorm Warning | GSP | 48 min |
| May 27, 3:37 AM EDT | Flash Flood Watch | GSP | 22 hr |
| May 27, 5:56 PM EDT | Areal Flood Advisory | GSP | 9 hr |
| May 28, 3:09 PM EDT | Severe Thunderstorm Warning | GSP | 51 min |
| May 28, 3:28 PM EDT | Areal Flood Advisory | GSP | 3 hr |
| May 28, 7:43 PM EDT | Areal Flood Advisory | GSP | 2 hr |
| May 29, 11:16 AM EDT | Special Weather Statement | CAE | 44 min |
| May 29, 12:13 PM EDT | Special Weather Statement | GSP | 32 min |
| May 29, 12:20 PM EDT | Special Weather Statement | GSP | 40 min |
| May 29, 12:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 29, 12:39 PM EDT | Severe Thunderstorm Warning | GSP | 39 min |
| May 29, 12:58 PM EDT | Severe Thunderstorm Warning | GSP | 32 min |
| May 29, 1:01 PM EDT | Areal Flood Advisory | GSP | 6 hr |
| Jun 5, 3:48 PM EDT | Special Weather Statement | GSP | 27 min |
| Jun 7, 9:47 PM EDT | Special Weather Statement | GSP | 28 min |
| Jun 7, 10:16 PM EDT | Special Weather Statement | GSP | 29 min |
| Jun 8, 8:30 PM EDT | Special Weather Statement | GSP | 30 min |
| Jun 8, 9:11 PM EDT | Special Weather Statement | GSP | 34 min |
| Jun 11, 11:50 AM EDT | Flash Flood Watch | GSP | 16 hr |
| Jun 11, 10:23 PM EDT | Special Weather Statement | GSP | 52 min |
| Jun 11, 10:54 PM EDT | Special Weather Statement | GSP | 36 min |
| Jun 11, 11:05 PM EDT | Severe Thunderstorm Warning | GSP | 40 min |
| Jun 22, 7:14 PM EDT | Special Weather Statement | GSP | 31 min |
| Jun 25, 5:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 28, 4:53 PM EDT | Special Weather Statement | CAE | 22 min |
| Jun 28, 5:12 PM EDT | Severe Thunderstorm Warning | GSP | 48 min |
| Jun 28, 5:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 30, 6:49 PM EDT | Special Weather Statement | GSP | 41 min |
| Jul 13, 1:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 13, 2:20 PM EDT | Special Weather Statement | GSP | 25 min |
| Jul 13, 4:30 PM EDT | Special Weather Statement | GSP | 30 min |
| Jul 17, 8:03 PM EDT | Special Weather Statement | GSP | 27 min |
| Jul 17, 8:45 PM EDT | Special Weather Statement | CAE | 30 min |
| Jul 17, 8:47 PM EDT | Special Weather Statement | GSP | 28 min |
| Jul 17, 9:14 PM EDT | Special Weather Statement | GSP | 31 min |
| Jul 18, 3:51 PM EDT | Special Weather Statement | GSP | 24 min |
| Jul 18, 4:15 PM EDT | Special Weather Statement | GSP | 30 min |
| Jul 18, 4:33 PM EDT | Severe Thunderstorm Warning | GSP | 31 min |
| Jul 18, 5:59 PM EDT | Severe Thunderstorm Warning | GSP | 46 min |
| Jul 18, 6:00 PM EDT | Special Weather Statement | CAE | 45 min |
| Jul 18, 6:33 PM EDT | Severe Thunderstorm Warning | GSP | 24 min |
| Jul 19, 2:27 PM EDT | Heat Advisory | GSP | 28 hr |
| Jul 20, 12:57 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 2:49 PM EDT | Heat Advisory | GSP | 29 hr |
| Jul 20, 4:06 PM EDT | Special Weather Statement | GSP | 24 min |
| Jul 20, 4:45 PM EDT | Special Weather Statement | GSP | 30 min |
| Jul 20, 4:49 PM EDT | Severe Thunderstorm Warning | GSP | 41 min |
| Jul 21, 1:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 2:52 PM EDT | Heat Advisory | GSP | 29 hr |
| Jul 22, 7:27 PM EDT | Special Weather Statement | GSP | 33 min |
| Jul 24, 3:25 PM EDT | Special Weather Statement | GSP | 35 min |
| Jul 24, 3:42 PM EDT | Special Weather Statement | GSP | 33 min |
| Jul 24, 3:44 PM EDT | Severe Thunderstorm Warning | GSP | 27 min |
| Jul 24, 4:16 PM EDT | Special Weather Statement | GSP | 29 min |
| Jul 24, 4:22 PM EDT | Special Weather Statement | GSP | 23 min |
| Jul 24, 5:11 PM EDT | Special Weather Statement | GSP | 34 min |
| Jul 28, 10:44 PM EDT | Special Weather Statement | GSP | 31 min |
| Jul 29, 1:03 PM EDT | Special Weather Statement | GSP | 57 min |
| Jul 29, 1:54 PM EDT | Special Weather Statement | GSP | 51 min |
| Jul 29, 2:44 PM EDT | Special Weather Statement | GSP | 31 min |
| Aug 1, 1:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 6, 2:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 9, 6:31 PM EDT | Special Weather Statement | GSP | 29 min |
| Aug 9, 6:39 PM EDT | Special Weather Statement | GSP | 36 min |
| Aug 9, 7:13 PM EDT | Areal Flood Advisory | GSP | 2 hr |
| Aug 10, 4:44 PM EDT | Special Weather Statement | GSP | 31 min |
| Aug 10, 5:34 PM EDT | Special Weather Statement | GSP | 26 min |
| Aug 10, 5:41 PM EDT | Severe Thunderstorm Warning | GSP | 29 min |
| Aug 10, 6:09 PM EDT | Areal Flood Advisory | GSP | 2 hr |
| Aug 12, 6:44 PM EDT | Special Weather Statement | GSP | 46 min |
| Aug 15, 3:09 PM EDT | Special Weather Statement | GSP | 36 min |
| Aug 15, 4:50 PM EDT | Flash Flood Warning | GSP | 3 hr |
| Aug 21, 12:04 PM EDT | Special Weather Statement | GSP | 26 min |
| Aug 21, 12:28 PM EDT | Special Weather Statement | GSP | 32 min |
| Aug 22, 3:32 AM EDT | Dense Fog Advisory | GSP | 5 hr |
| Aug 31, 10:01 AM EDT | Special Weather Statement | GSP | 44 min |
| Aug 31, 10:10 AM EDT | Severe Thunderstorm Warning | GSP | 50 min |
| Aug 31, 11:00 AM EDT | Special Weather Statement | GSP | 30 min |
| Aug 31, 11:20 AM EDT | Special Weather Statement | GSP | 25 min |
| Aug 31, 3:47 PM EDT | Special Weather Statement | GSP | 43 min |
| Aug 31, 3:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Sep 2, 12:58 AM EDT | Special Weather Statement | GSP | 32 min |
| Sep 2, 1:24 AM EDT | Special Weather Statement | GSP | 51 min |
| Sep 11, 6:43 PM EDT | Special Weather Statement | GSP | 32 min |
| Sep 16, 4:28 AM EDT | Flood Watch | GSP | 46 min |
| Sep 16, 5:14 AM EDT | Flash Flood Watch | GSP | 39 hr |
| Sep 25, 9:23 AM EDT | Areal Flood Advisory | GSP | 3 hr |
| Sep 27, 5:21 AM EDT | Dense Fog Advisory | GSP | 4 hr |
| Sep 29, 2:36 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 29, 3:24 PM EDT | Special Weather Statement | GSP | 36 min |
| Sep 29, 4:00 PM EDT | Special Weather Statement | GSP | 45 min |
| Oct 11, 7:26 AM EDT | Mesoscale Discussion | SPC | 94 min |
| Oct 11, 12:10 PM EDT | Special Weather Statement | GSP | 35 min |
| Oct 11, 6:22 PM EDT | Special Weather Statement | CAE | 23 min |
| Oct 11, 6:50 PM EDT | Tornado Warning | GSP | 25 min |
| Oct 11, 9:10 PM EDT | Areal Flood Advisory | GSP | 3 hr |
| Oct 13, 2:33 AM EDT | Dense Fog Advisory | GSP | 6 hr |
| Oct 15, 6:36 AM EDT | Dense Fog Advisory | GSP | 3 hr |
| Oct 27, 3:53 AM EDT | Dense Fog Advisory | GSP | 6 hr |
| Oct 28, 2:47 PM EDT | Wind Advisory | GSP | 27 hr |
| Oct 29, 10:18 PM EDT | Special Weather Statement | GSP | 42 min |
| Oct 29, 10:52 PM EDT | Special Weather Statement | GSP | 53 min |
| Nov 2, 11:45 AM EST | Frost Advisory | GSP | 21 hr |
| Nov 2, 11:45 AM EST | Freeze Warning | GSP | 21 hr |
| Nov 10, 2:30 PM EST | Flood Watch | GSP | 47 hr |
| Nov 12, 9:46 AM EST | Flash Flood Warning | GSP | 4 hr |
| Nov 12, 1:57 PM EST | Areal Flood Warning | GSP | 9 hr |
| Nov 15, 6:21 AM EST | Dense Fog Advisory | GSP | 4 hr |
| Nov 22, 10:55 PM EST | Dense Fog Advisory | GSP | 5 hr |
| Nov 26, 9:04 PM EST | Dense Fog Advisory | GSP | 14 hr |
| Nov 30, 6:44 AM EST | Special Weather Statement | GSP | 46 min |
| Dec 4, 8:18 PM EST | Special Weather Statement | GSP | 57 min |
| Dec 4, 9:14 PM EST | Special Weather Statement | GSP | 16 min |
| Dec 14, 8:38 AM EST | Special Weather Statement | GSP | 52 min |
| Dec 14, 9:25 AM EST | Special Weather Statement | GSP | 50 min |
| Dec 31, 8:14 AM EST | Dense Fog Advisory | GSP | 3 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 | 29 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 24 |
| Special Weather Statement | 83 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 5 |
| Flood Watch | 2 |
| Areal Flood Advisory | 16 |
| Winter | |
| Winter Weather Advisory | 1 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 5 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 16 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.