Alert archive / North Carolina / Swain County
Weather alerts in Swain County, North Carolina, 2021
85 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Swain County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 85
- Warnings
- 11
- Watches
- 16
- Advisories
- 36
- Busiest month
- March17 alerts
- Busiest day
- May 28, 20214 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Swain County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 3 | 2 | 33% | 1 | 100% | 9 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Greenville-Spartanburg, SC: tornado warnings | 63 | 8 | 87% | 23 | 78% | 24 min |
| NWS Greenville-Spartanburg, SC: severe thunderstorm warnings | 176 | 95 | 46% | 267 | 63% | 17 min |
| NWS Greenville-Spartanburg, SC: flash flood warnings | 47 | 22 | 53% | 57 | 70% | 94 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 5, 3:46 AM EST | Winter Weather Advisory | GSP | 18 hr |
| Jan 6, 2:33 PM EST | Winter Storm Watch | GSP | 24 hr |
| Jan 7, 4:31 AM EST | Winter Storm Warning | GSP | 40 hr |
| Jan 7, 2:51 PM EST | Winter Weather Advisory | GSP | 29 hr |
| Jan 8, 8:12 PM EST | Winter Weather Advisory | GSP | 16 hr |
| Jan 15, 2:44 PM EST | Winter Weather Advisory | GSP | 40 hr |
| Jan 17, 2:42 PM EST | Winter Weather Advisory | GSP | 21 hr |
| Jan 25, 9:29 PM EST | Special Weather Statement | GSP | 31 min |
| Jan 26, 12:22 AM EST | Special Weather Statement | GSP | 38 min |
| Jan 26, 10:48 PM EST | Winter Storm Watch | GSP | 4 hr |
| Jan 27, 2:46 AM EST | Winter Storm Warning | GSP | 33 hr |
| Jan 27, 2:46 AM EST | Winter Weather Advisory | GSP | 33 hr |
| Jan 30, 4:21 AM EST | Winter Weather Advisory | GSP | 31 hr |
| Jan 31, 4:33 AM EST | Winter Storm Watch | GSP | 11 hr |
| Jan 31, 3:03 PM EST | Winter Storm Warning | GSP | 46 hr |
| Jan 31, 3:03 PM EST | Winter Weather Advisory | GSP | 46 hr |
| Feb 1, 4:23 AM EST | Wind Advisory | GSP | 57 hr |
| Feb 2, 2:36 PM EST | Wind Chill Advisory | GSP | 19 hr |
| Feb 4, 3:51 AM EST | Wind Advisory | GSP | 24 hr |
| Feb 4, 9:07 PM EST | Winter Weather Advisory | GSP | 10 hr |
| Feb 5, 11:49 AM EST | Winter Storm Watch | GSP | 16 hr |
| Feb 6, 3:58 AM EST | Winter Storm Warning | GSP | 32 hr |
| Feb 15, 4:07 AM EST | Wind Advisory | GSP | 20 hr |
| Feb 16, 2:48 PM EST | Winter Storm Watch | GSP | 13 hr |
| Feb 17, 4:15 AM EST | Winter Storm Warning | GSP | 32 hr |
| Feb 17, 4:15 AM EST | Winter Weather Advisory | GSP | 30 hr |
| Mar 1, 1:57 AM EST | Special Weather Statement | GSP | 63 min |
| Mar 1, 3:05 AM EST | Special Weather Statement | GSP | 55 min |
| Mar 1, 5:55 AM EST | Areal Flood Advisory | GSP | 3 hr |
| Mar 25, 4:16 AM EDT | Flash Flood Watch | GSP | 23 hr |
| Mar 25, 5:31 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Mar 26, 12:27 AM EDT | River Flood Advisory | GSP | 11 hr |
| Mar 26, 1:13 AM EDT | Areal Flood Advisory | GSP | 5 hr |
| Mar 26, 4:49 AM EDT | Areal Flood Advisory | GSP | 24 hr |
| Mar 27, 11:58 AM EDT | Special Weather Statement | GSP | 62 min |
| Mar 27, 12:50 PM EDT | Flash Flood Watch | GSP | 23 hr |
| Mar 28, 2:25 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Mar 28, 3:07 AM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Mar 28, 8:41 AM EDT | Special Weather Statement | GSP | 49 min |
| Mar 30, 3:19 PM EDT | Flash Flood Watch | GSP | 24 hr |
| Mar 31, 4:25 AM EDT | Wind Advisory | GSP | 43 hr |
| Mar 31, 9:23 AM EDT | Areal Flood Advisory | GSP | 3 hr |
| Mar 31, 9:57 AM EDT | Flash Flood Warning | GSP | 5 hr |
| Apr 15, 2:08 PM EDT | Frost Advisory | GSP | 19 hr |
| Apr 20, 3:28 AM EDT | Freeze Watch | GSP | 24 hr |
| Apr 21, 3:40 AM EDT | Freeze Warning | GSP | 29 hr |
| Apr 21, 8:58 PM EDT | Freeze Watch | GSP | 7 hr |
| Apr 22, 3:35 AM EDT | Freeze Warning | GSP | 29 hr |
| Apr 29, 2:40 PM EDT | Wind Advisory | GSP | 33 hr |
| May 4, 9:37 AM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 4, 10:57 AM EDT | Severe Thunderstorm Warning | GSP | 36 min |
| May 4, 12:09 PM EDT | Areal Flood Advisory | GSP | 3 hr |
| May 10, 12:19 AM EDT | Special Weather Statement | GSP | 56 min |
| May 28, 4:44 PM EDT | Special Weather Statement | GSP | 31 min |
| May 28, 5:53 PM EDT | Special Weather Statement | GSP | 52 min |
| May 28, 6:01 PM EDT | Special Weather Statement | GSP | 59 min |
| May 28, 6:38 PM EDT | Special Weather Statement | GSP | 67 min |
| Jun 11, 5:48 AM EDT | Special Weather Statement | GSP | 57 min |
| Jun 21, 7:31 PM EDT | Severe Thunderstorm Warning | GSP | 44 min |
| Jun 21, 8:08 PM EDT | Special Weather Statement | GSP | 52 min |
| Jul 1, 4:24 PM EDT | Flash Flood Watch | GSP | 14 hr |
| Jul 2, 2:50 AM EDT | Special Weather Statement | GSP | 55 min |
| Aug 1, 2:50 AM EDT | Special Weather Statement | GSP | 25 min |
| Aug 1, 3:15 AM EDT | Special Weather Statement | GSP | 30 min |
| Aug 6, 8:35 PM EDT | Special Weather Statement | GSP | 40 min |
| Aug 10, 1:04 PM EDT | Special Weather Statement | MRX | 41 min |
| Aug 10, 6:24 PM EDT | Severe Thunderstorm Warning | GSP | 51 min |
| Aug 14, 6:20 PM EDT | Special Weather Statement | GSP | 25 min |
| Aug 16, 2:20 PM EDT | Flash Flood Watch | GSP | 40 hr |
| Aug 17, 10:03 PM EDT | Areal Flood Advisory | GSP | 11 hr |
| Aug 18, 12:00 AM EDT | River Flood Advisory | GSP | 10 hr |
| Aug 25, 5:50 PM EDT | Areal Flood Advisory | GSP | 117 min |
| Aug 27, 3:04 AM EDT | Dense Fog Advisory | GSP | 7 hr |
| Aug 30, 3:09 PM EDT | Flash Flood Watch | GSP | 39 hr |
| Aug 31, 10:16 AM EDT | Wind Advisory | GSP | 18 hr |
| Oct 7, 1:02 PM EDT | Areal Flood Advisory | GSP | 8 hr |
| Oct 17, 3:43 AM EDT | Frost Advisory | GSP | 29 hr |
| Dec 11, 3:35 AM EST | Wind Advisory | GSP | 24 hr |
| Dec 11, 11:33 AM EST | Special Weather Statement | GSP | 72 min |
| Dec 18, 3:29 AM EST | Dense Fog Advisory | GSP | 8 hr |
| Dec 25, 3:44 AM EST | Wind Advisory | GSP | 21 hr |
| Dec 29, 10:16 PM EST | Tornado Watch | SPC | 7 hr |
| Dec 31, 4:18 AM EST | Dense Fog Advisory | GSP | 5 hr |
| Dec 31, 9:04 AM EST | Dense Fog Advisory | GSP | 56 min |
| Dec 31, 10:02 AM EST | Dense Fog Advisory | GSP | 58 min |
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 | 3 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 2 |
| Special Weather Statement | 20 |
| Flooding | |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 6 |
| Areal Flood Advisory | 8 |
| River Flood Advisory | 2 |
| Winter | |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 10 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 2 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 8 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
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.