Alert archive / North Carolina / Swain County
Weather alerts in Swain County, North Carolina, 2017
84 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 84
- Warnings
- 10
- Watches
- 9
- Advisories
- 29
- Busiest month
- April13 alerts
- Busiest day
- March 10, 20174 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, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 5 | 3 | 40% | 1 | 100% | 35 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Greenville-Spartanburg, SC: tornado warnings | 35 | 12 | 66% | 46 | 93% | 19 min |
| NWS Greenville-Spartanburg, SC: severe thunderstorm warnings | 286 | 227 | 21% | 736 | 76% | 20 min |
| NWS Greenville-Spartanburg, SC: flash flood warnings | 23 | 14 | 39% | 50 | 64% | 48 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, 3:15 PM EST | Winter Storm Warning | GSP | 46 hr |
| Jan 6, 8:56 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 7, 3:42 AM EST | Wind Chill Advisory | GSP | 32 hr |
| Jan 7, 3:04 PM EST | Winter Weather Advisory | GSP | 21 hr |
| Jan 8, 2:55 PM EST | Winter Weather Advisory | GSP | 21 hr |
| Jan 9, 2:48 PM EST | Winter Weather Advisory | GSP | 21 hr |
| Jan 23, 3:48 AM EST | Wind Advisory | GSP | 32 hr |
| Jan 28, 3:18 PM EST | Winter Weather Advisory | GSP | 43 hr |
| Feb 7, 3:53 PM EST | Special Weather Statement | GSP | 52 min |
| Feb 8, 4:47 PM EST | Special Weather Statement | GSP | 43 min |
| Feb 8, 9:49 PM EST | Special Weather Statement | GSP | 41 min |
| Feb 8, 10:23 PM EST | Special Weather Statement | GSP | 52 min |
| Feb 12, 3:51 AM EST | Wind Advisory | GSP | 33 hr |
| Feb 25, 5:20 AM EST | Special Weather Statement | GSP | 25 min |
| Mar 1, 3:02 PM EST | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 1, 3:53 PM EST | Special Weather Statement | GSP | 67 min |
| Mar 1, 4:17 PM EST | Severe Thunderstorm Warning | GSP | 43 min |
| Mar 10, 3:53 AM EST | Wind Advisory | GSP | 17 hr |
| Mar 10, 3:55 AM EST | Winter Storm Watch | GSP | 12 hr |
| Mar 10, 3:33 PM EST | Winter Storm Warning | GSP | 36 hr |
| Mar 10, 3:33 PM EST | Winter Weather Advisory | GSP | 42 hr |
| Mar 13, 4:14 AM EDT | Winter Weather Advisory | GSP | 52 hr |
| Mar 21, 3:33 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 21, 8:09 PM EDT | Severe Thunderstorm Warning | GSP | 66 min |
| Mar 30, 10:21 PM EDT | Special Weather Statement | GSP | 39 min |
| Apr 4, 1:17 AM EDT | Special Weather Statement | GSP | 28 min |
| Apr 4, 1:53 AM EDT | Special Weather Statement | GSP | 37 min |
| Apr 5, 3:31 PM EDT | Wind Advisory | GSP | 52 hr |
| Apr 5, 7:57 PM EDT | Mesoscale Discussion | SPC | 48 min |
| Apr 5, 10:33 PM EDT | Special Weather Statement | GSP | 27 min |
| Apr 6, 4:12 AM EDT | Winter Weather Advisory | GSP | 30 hr |
| Apr 21, 2:12 PM EDT | Special Weather Statement | GSP | 33 min |
| Apr 21, 2:13 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 22, 2:57 PM EDT | Flood Watch | GSP | 61 hr |
| Apr 23, 8:11 PM EDT | Special Weather Statement | GSP | 2 hr |
| Apr 23, 8:24 PM EDT | Special Weather Statement | GSP | 111 min |
| Apr 23, 10:23 PM EDT | Special Weather Statement | GSP | 52 min |
| Apr 23, 11:56 PM EDT | River Flood Advisory | GSP | 12 hr |
| May 1, 2:48 PM EDT | Wind Advisory | GSP | 24 hr |
| May 3, 3:26 AM EDT | Wind Advisory | GSP | 43 hr |
| May 12, 2:06 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 24, 4:23 AM EDT | Flash Flood Watch | GSP | 18 hr |
| May 24, 10:04 AM EDT | Tornado Watch | SPC | 11 hr |
| May 24, 11:10 AM EDT | Severe Thunderstorm Warning | GSP | 47 min |
| May 24, 3:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| May 27, 6:55 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 27, 10:46 PM EDT | Mesoscale Discussion | SPC | 89 min |
| May 27, 10:55 PM EDT | Severe Thunderstorm Warning | GSP | 50 min |
| Jun 14, 1:17 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 3:48 PM EDT | Special Weather Statement | GSP | 42 min |
| Jul 1, 1:18 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 4, 8:05 PM EDT | Special Weather Statement | GSP | 55 min |
| Jul 6, 1:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jul 8, 2:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 3:12 PM EDT | Special Weather Statement | GSP | 33 min |
| Jul 23, 11:36 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 11:59 PM EDT | Special Weather Statement | GSP | 46 min |
| Jul 24, 1:21 AM EDT | Special Weather Statement | GSP | 24 min |
| Sep 1, 9:11 AM EDT | Wind Advisory | GSP | 9 hr |
| Sep 5, 3:36 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Sep 5, 4:44 PM EDT | Special Weather Statement | GSP | 31 min |
| Sep 5, 5:14 PM EDT | Special Weather Statement | GSP | 31 min |
| Sep 5, 5:15 PM EDT | Severe Thunderstorm Warning | GSP | 45 min |
| Sep 10, 3:34 PM EDT | Wind Advisory | GSP | 36 hr |
| Oct 7, 2:57 PM EDT | Flash Flood Watch | GSP | 37 hr |
| Oct 7, 3:03 PM EDT | High Wind Watch | GSP | 13 hr |
| Oct 8, 4:28 AM EDT | High Wind Warning | GSP | 24 hr |
| Oct 17, 3:35 AM EDT | Frost Advisory | GSP | 29 hr |
| Oct 23, 3:01 AM EDT | Wind Advisory | GSP | 11 hr |
| Oct 24, 2:48 PM EDT | Frost Advisory | GSP | 18 hr |
| Oct 25, 3:13 AM EDT | Freeze Warning | GSP | 30 hr |
| Nov 18, 3:53 AM EST | Wind Advisory | GSP | 32 hr |
| Nov 18, 9:14 PM EST | Special Weather Statement | GSP | 61 min |
| Nov 18, 10:13 PM EST | Special Weather Statement | GSP | 32 min |
| Dec 7, 4:42 PM EST | Winter Weather Advisory | GSP | 43 hr |
| Dec 7, 9:47 PM EST | Winter Storm Warning | GSP | 38 hr |
| Dec 8, 12:06 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 9, 2:45 PM EST | Winter Weather Advisory | GSP | 19 hr |
| Dec 11, 3:10 PM EST | Wind Chill Advisory | GSP | 40 hr |
| Dec 11, 3:10 PM EST | Winter Weather Advisory | GSP | 40 hr |
| Dec 11, 3:26 PM EST | Wind Advisory | GSP | 40 hr |
| Dec 13, 3:39 AM EST | Wind Advisory | GSP | 27 hr |
| Dec 24, 4:00 AM EST | Wind Advisory | GSP | 31 hr |
| Dec 31, 3:41 PM EST | Winter Weather Advisory | GSP | 18 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 | 5 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 13 |
| Special Weather Statement | 23 |
| Flooding | |
| Flash Flood Watch | 2 |
| Flood Watch | 1 |
| River Flood Advisory | 1 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 11 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 13 |
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.