Alert archive / North Carolina / Alexander County
Weather alerts in Alexander County, North Carolina, 2020
124 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Alexander County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 124
- Warnings
- 24
- Watches
- 12
- Advisories
- 38
- Busiest month
- August30 alerts
- Busiest day
- August 6, 20205 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Alexander County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 12 | 9 | 25% | 2 | 50% | 38 min |
| Flash flood warnings | 5 | 4 | 20% | 2 | 100% | 118 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 7, 2:30 PM EST | Wind Advisory | GSP | 28 hr |
| Jan 11, 5:38 PM EST | Tornado Watch | SPC | 6 hr |
| Jan 11, 8:22 PM EST | Severe Thunderstorm Warning | GSP | 53 min |
| Jan 11, 8:40 PM EST | Mesoscale Discussion | SPC | 95 min |
| Jan 11, 8:57 PM EST | Severe Thunderstorm Warning | GSP | 48 min |
| Jan 14, 4:53 AM EST | Dense Fog Advisory | GSP | 5 hr |
| Jan 15, 3:49 AM EST | Dense Fog Advisory | GSP | 6 hr |
| Jan 24, 2:24 PM EST | Special Weather Statement | GSP | 66 min |
| Jan 24, 8:48 PM EST | Dense Fog Advisory | GSP | 7 hr |
| Feb 1, 2:56 AM EST | Dense Fog Advisory | GSP | 3 hr |
| Feb 5, 4:20 AM EST | Flash Flood Watch | GSP | 44 hr |
| Feb 6, 10:27 AM EST | Areal Flood Advisory | GSP | 14 hr |
| Feb 6, 10:40 AM EST | Flash Flood Warning | GSP | 10 hr |
| Feb 6, 7:13 PM EST | Areal Flood Warning | GSP | 12 hr |
| Feb 6, 9:47 PM EST | Wind Advisory | GSP | 20 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 |
| Mar 24, 8:28 AM EDT | Dense Fog Advisory | GSP | 92 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, 3:23 AM EDT | Severe Thunderstorm Warning | GSP | 52 min |
| Apr 13, 4:13 AM EDT | Severe Thunderstorm Warning | GSP | 62 min |
| Apr 15, 3:46 AM EDT | Frost Advisory | GSP | 28 hr |
| Apr 16, 2:50 PM EDT | Frost Advisory | GSP | 17 hr |
| Apr 18, 9:58 PM EDT | Frost Advisory | GSP | 11 hr |
| May 5, 3:53 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 8, 2:49 PM EDT | Frost Advisory | GSP | 19 hr |
| May 8, 2:49 PM EDT | Freeze Watch | GSP | 13 hr |
| May 9, 4:10 AM EDT | Freeze Warning | GSP | 30 hr |
| May 18, 2:51 PM EDT | Flash Flood Watch | GSP | 3 days |
| May 19, 3:41 AM EDT | Areal Flood Advisory | GSP | 3 hr |
| May 22, 4:46 AM EDT | Dense Fog Advisory | GSP | 5 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, 2:48 PM EDT | Severe Thunderstorm Warning | GSP | 42 min |
| May 27, 3:37 AM EDT | Flash Flood Watch | GSP | 22 hr |
| May 29, 7:15 PM EDT | Special Weather Statement | GSP | 30 min |
| May 29, 10:58 PM EDT | Special Weather Statement | GSP | 32 min |
| Jun 19, 2:38 PM EDT | Special Weather Statement | GSP | 52 min |
| Jun 21, 9:09 PM EDT | Severe Thunderstorm Warning | GSP | 51 min |
| Jun 21, 10:22 PM EDT | Special Weather Statement | GSP | 38 min |
| Jun 21, 11:00 PM EDT | Special Weather Statement | GSP | 45 min |
| Jul 5, 1:47 PM EDT | Special Weather Statement | GSP | 28 min |
| Jul 5, 2:49 PM EDT | Special Weather Statement | GSP | 26 min |
| Jul 5, 3:19 PM EDT | Special Weather Statement | GSP | 26 min |
| Jul 17, 1:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 17, 3:23 PM EDT | Special Weather Statement | GSP | 37 min |
| Jul 17, 4:10 PM EDT | Special Weather Statement | GSP | 35 min |
| Jul 17, 4:48 PM EDT | Severe Thunderstorm Warning | GSP | 27 min |
| Jul 18, 12:43 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 18, 3:19 PM EDT | Severe Thunderstorm Warning | GSP | 41 min |
| Jul 18, 3:54 PM EDT | Special Weather Statement | GSP | 36 min |
| Jul 18, 4:03 PM EDT | Severe Thunderstorm Warning | GSP | 42 min |
| Jul 20, 12:57 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 3:09 PM EDT | Special Weather Statement | GSP | 36 min |
| Jul 20, 3:45 PM EDT | Special Weather Statement | GSP | 30 min |
| Jul 20, 4:02 PM EDT | Severe Thunderstorm Warning | GSP | 43 min |
| Jul 21, 1:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 21, 5:56 PM EDT | Severe Thunderstorm Warning | GSP | 38 min |
| Jul 23, 1:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 7:40 PM EDT | Special Weather Statement | GSP | 35 min |
| Jul 23, 8:11 PM EDT | Special Weather Statement | GSP | 34 min |
| Jul 27, 4:56 PM EDT | Special Weather Statement | GSP | 34 min |
| Jul 27, 5:02 PM EDT | Special Weather Statement | GSP | 28 min |
| Jul 31, 7:43 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 31, 9:05 PM EDT | Severe Thunderstorm Warning | GSP | 55 min |
| Aug 2, 2:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Aug 2, 3:09 PM EDT | Special Weather Statement | GSP | 36 min |
| Aug 2, 3:49 PM EDT | Special Weather Statement | GSP | 26 min |
| Aug 5, 1:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Aug 5, 7:10 PM EDT | Special Weather Statement | GSP | 35 min |
| Aug 5, 8:06 PM EDT | Areal Flood Advisory | GSP | 3 hr |
| Aug 5, 11:25 PM EDT | Special Weather Statement | GSP | 35 min |
| Aug 6, 2:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 6, 7:03 PM EDT | Special Weather Statement | GSP | 27 min |
| Aug 6, 7:24 PM EDT | Areal Flood Advisory | GSP | 3 hr |
| Aug 6, 8:40 PM EDT | Areal Flood Advisory | GSP | 4 hr |
| Aug 12, 1:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 5:07 PM EDT | Special Weather Statement | GSP | 38 min |
| Aug 12, 5:27 PM EDT | Areal Flood Advisory | GSP | 3 hr |
| Aug 13, 3:50 PM EDT | Special Weather Statement | GSP | 40 min |
| Aug 13, 4:28 PM EDT | Special Weather Statement | GSP | 47 min |
| Aug 13, 5:00 PM EDT | Special Weather Statement | GSP | 45 min |
| Aug 14, 3:43 AM EDT | Flash Flood Watch | GSP | 41 hr |
| Aug 14, 10:47 PM EDT | Special Weather Statement | GSP | 73 min |
| Aug 15, 2:19 AM EDT | Flash Flood Warning | GSP | 4 hr |
| Aug 15, 4:29 AM EDT | Areal Flood Advisory | GSP | 5 hr |
| Aug 15, 4:28 PM EDT | Flash Flood Warning | GSP | 2 hr |
| Aug 17, 2:50 PM EDT | Special Weather Statement | GSP | 25 min |
| Aug 21, 10:02 AM EDT | Special Weather Statement | GSP | 43 min |
| Aug 24, 7:36 PM EDT | Special Weather Statement | GSP | 39 min |
| Aug 28, 2:25 PM EDT | Special Weather Statement | GSP | 35 min |
| Aug 28, 7:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 31, 3:23 AM EDT | Special Weather Statement | GSP | 52 min |
| Aug 31, 3:53 AM EDT | Flash Flood Watch | GSP | 22 hr |
| Sep 16, 5:14 AM EDT | Flash Flood Watch | GSP | 39 hr |
| Sep 29, 1:26 PM EDT | Special Weather Statement | GSP | 34 min |
| Oct 13, 2:33 AM EDT | Dense Fog Advisory | GSP | 6 hr |
| Oct 16, 11:11 AM EDT | Frost Advisory | GSP | 23 hr |
| Oct 17, 2:43 PM EDT | Frost Advisory | GSP | 18 hr |
| Oct 24, 10:29 PM EDT | Special Weather Statement | GSP | 46 min |
| Oct 28, 2:13 PM EDT | Tropical Storm Warning | GSP | 24 hr |
| Oct 28, 2:47 PM EDT | Wind Advisory | GSP | 27 hr |
| Oct 30, 5:51 AM EDT | Areal Flood Advisory | GSP | 12 hr |
| Oct 30, 2:46 PM EDT | Frost Advisory | GSP | 19 hr |
| Nov 1, 3:58 AM EST | Freeze Watch | GSP | 7 hr |
| Nov 1, 3:58 AM EST | Freeze Warning | GSP | 29 hr |
| Nov 2, 11:45 AM EST | Freeze Warning | GSP | 21 hr |
| Nov 10, 2:30 PM EST | Flood Watch | GSP | 47 hr |
| Nov 11, 5:38 AM EST | Special Weather Statement | GSP | 52 min |
| Nov 11, 10:18 AM EST | Areal Flood Advisory | GSP | 6 hr |
| Nov 11, 10:52 AM EST | Areal Flood Advisory | GSP | 9 hr |
| Nov 12, 3:22 AM EST | Areal Flood Advisory | GSP | 3 hr |
| Nov 12, 3:45 AM EST | Flash Flood Warning | GSP | 8 hr |
| Nov 12, 4:17 AM EST | Flash Flood Warning | GSP | 6 hr |
| Nov 12, 10:14 AM EST | Areal Flood Warning | GSP | 11 hr |
| Nov 26, 9:04 PM EST | Dense Fog Advisory | GSP | 14 hr |
| Dec 15, 4:31 AM EST | Winter Weather Advisory | GSP | 41 hr |
| Dec 17, 2:48 AM EST | Dense Fog Advisory | GSP | 7 hr |
| Dec 21, 3:14 AM EST | Wind Advisory | GSP | 33 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 | 12 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 14 |
| Special Weather Statement | 36 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 5 |
| Flash Flood Watch | 6 |
| Flood Watch | 1 |
| Areal Flood Advisory | 11 |
| Winter | |
| Winter Weather Advisory | 2 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 2 |
| Frost Advisory | 8 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 12 |
| Tropical | |
| Tropical Storm Warning | 1 |
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.