Alert archive / North Carolina / Henderson County
Weather alerts in Henderson County, North Carolina, 2017
161 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Henderson County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 161
- Warnings
- 37
- Watches
- 14
- Advisories
- 50
- Busiest month
- October29 alerts
- Busiest day
- October 23, 201712 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Henderson County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 20 | 15 | 25% | 14 | 93% | 11 min |
| Flash flood warnings | 1 | 1 | 0% | 2 | 50% | 144 min |
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, 3:58 AM EST | Winter Storm Watch | GSP | 11 hr |
| 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, 1:00 AM EST | Areal Flood Advisory | GSP | 2 hr |
| Jan 23, 3:48 AM EST | Wind Advisory | GSP | 32 hr |
| Feb 8, 3:46 AM EST | Wind Advisory | GSP | 39 hr |
| Feb 8, 4:11 AM EST | Dense Fog Advisory | GSP | 6 hr |
| Feb 8, 6:23 PM EST | Special Weather Statement | GSP | 37 min |
| Feb 11, 2:54 PM EST | High Wind Watch | GSP | 13 hr |
| Feb 12, 3:51 AM EST | High Wind Warning | GSP | 33 hr |
| Mar 1, 2:07 PM EST | Mesoscale Discussion | SPC | 113 min |
| Mar 1, 2:35 PM EST | Wind Advisory | GSP | 21 hr |
| Mar 1, 3:02 PM EST | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 10, 3:53 AM EST | Wind Advisory | GSP | 17 hr |
| Mar 10, 3:33 PM 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 21, 4:08 PM EDT | Special Weather Statement | GSP | 37 min |
| Mar 21, 4:37 PM EDT | Severe Thunderstorm Warning | GSP | 38 min |
| Mar 21, 9:40 PM EDT | Special Weather Statement | GSP | 65 min |
| Mar 21, 9:59 PM EDT | Severe Thunderstorm Warning | GSP | 46 min |
| Mar 31, 12:22 AM EDT | Special Weather Statement | GSP | 38 min |
| Mar 31, 3:47 AM EDT | Areal Flood Advisory | GSP | 3 hr |
| Mar 31, 4:55 AM EDT | Flash Flood Warning | GSP | 3 hr |
| Mar 31, 9:15 AM EDT | Areal Flood Advisory | GSP | 3 hr |
| Apr 3, 2:53 PM EDT | Areal Flood Advisory | GSP | 112 min |
| Apr 3, 4:54 PM EDT | Areal Flood Advisory | GSP | 8 hr |
| Apr 3, 5:06 PM EDT | Areal Flood Advisory | GSP | 6 hr |
| Apr 5, 3:50 AM EDT | High Wind Watch | GSP | 12 hr |
| Apr 5, 3:31 PM EDT | High Wind Warning | GSP | 43 hr |
| Apr 5, 3:31 PM EDT | Wind Advisory | GSP | 52 hr |
| Apr 14, 1:03 PM EDT | Special Weather Statement | GSP | 27 min |
| Apr 21, 2:13 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 21, 4:19 PM EDT | Mesoscale Discussion | SPC | 56 min |
| 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, 10:47 PM EDT | Areal Flood Advisory | GSP | 3 hr |
| Apr 24, 1:46 AM EDT | Areal Flood Advisory | GSP | 119 min |
| Apr 24, 4:56 AM EDT | River Flood Advisory | GSP | 12 hr |
| Apr 24, 5:07 AM EDT | Areal Flood Warning | GSP | 12 hr |
| Apr 24, 12:13 PM EDT | Areal Flood Advisory | GSP | 6 hr |
| Apr 24, 5:17 PM EDT | River Flood Advisory | GSP | 12 hr |
| Apr 27, 3:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| May 1, 1:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| May 1, 2:48 PM EDT | Wind Advisory | GSP | 24 hr |
| May 3, 3:26 AM EDT | Wind Advisory | GSP | 43 hr |
| May 4, 11:48 PM EDT | Areal Flood Advisory | GSP | 6 hr |
| May 12, 2:06 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 19, 1:16 PM EDT | Special Weather Statement | GSP | 29 min |
| May 19, 1:42 PM EDT | Severe Thunderstorm Warning | GSP | 28 min |
| May 19, 3:09 PM EDT | Severe Thunderstorm Warning | GSP | 51 min |
| May 19, 4:07 PM EDT | Areal Flood Advisory | GSP | 113 min |
| May 21, 4:24 AM EDT | Flash Flood Watch | GSP | 18 hr |
| May 22, 1:54 PM EDT | Flash Flood Watch | GSP | 36 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, 3:02 PM EDT | Mesoscale Discussion | SPC | 88 min |
| May 24, 5:25 PM EDT | Mesoscale Discussion | SPC | 65 min |
| May 24, 7:28 PM EDT | Areal Flood Advisory | GSP | 107 min |
| May 24, 9:22 PM EDT | Areal Flood Advisory | GSP | 3 hr |
| 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, 11:37 PM EDT | Severe Thunderstorm Warning | GSP | 53 min |
| May 28, 12:18 AM EDT | Severe Thunderstorm Warning | GSP | 57 min |
| May 29, 5:00 PM EDT | Special Weather Statement | GSP | 30 min |
| Jun 13, 1:40 PM EDT | Special Weather Statement | GSP | 35 min |
| Jun 13, 2:04 PM EDT | Severe Thunderstorm Warning | GSP | 28 min |
| Jun 13, 5:29 PM EDT | Special Weather Statement | GSP | 31 min |
| Jun 13, 5:32 PM EDT | Severe Thunderstorm Warning | GSP | 43 min |
| Jun 14, 1:17 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 14, 7:38 PM EDT | Special Weather Statement | GSP | 52 min |
| Jun 15, 1:32 PM EDT | Special Weather Statement | GSP | 28 min |
| Jun 15, 1:37 PM EDT | Special Weather Statement | GSP | 23 min |
| Jun 15, 2:12 PM EDT | Severe Thunderstorm Warning | GSP | 48 min |
| Jun 24, 2:34 PM EDT | Special Weather Statement | GSP | 26 min |
| Jun 24, 2:47 PM EDT | Severe Thunderstorm Warning | GSP | 43 min |
| Jul 1, 3:58 PM EDT | Special Weather Statement | GSP | 32 min |
| Jul 5, 3:51 PM EDT | Special Weather Statement | GSP | 24 min |
| Jul 6, 2:10 PM EDT | Severe Thunderstorm Warning | GSP | 50 min |
| Jul 6, 5:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jul 8, 2:14 PM EDT | Special Weather Statement | GSP | 46 min |
| Jul 8, 2:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 4:15 PM EDT | Severe Thunderstorm Warning | GSP | 24 min |
| Jul 8, 5:37 PM EDT | Areal Flood Advisory | GSP | 113 min |
| Jul 11, 3:25 PM EDT | Special Weather Statement | GSP | 35 min |
| Jul 12, 3:01 PM EDT | Special Weather Statement | GSP | 29 min |
| Jul 12, 3:10 PM EDT | Special Weather Statement | GSP | 35 min |
| Jul 13, 5:17 PM EDT | Severe Thunderstorm Warning | GSP | 43 min |
| Jul 13, 6:01 PM EDT | Special Weather Statement | GSP | 29 min |
| Jul 14, 5:18 PM EDT | Special Weather Statement | GSP | 27 min |
| Jul 14, 7:00 PM EDT | Severe Thunderstorm Warning | GSP | 30 min |
| Jul 15, 12:56 PM EDT | Special Weather Statement | GSP | 49 min |
| Jul 15, 1:04 PM EDT | Severe Thunderstorm Warning | GSP | 41 min |
| Jul 15, 1:38 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Jul 15, 1:53 PM EDT | Special Weather Statement | GSP | 37 min |
| Jul 17, 2:59 PM EDT | Special Weather Statement | GSP | 31 min |
| Jul 17, 7:09 PM EDT | Severe Thunderstorm Warning | GSP | 36 min |
| Jul 17, 9:00 PM EDT | Special Weather Statement | GSP | 30 min |
| Jul 18, 2:31 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jul 18, 5:55 PM EDT | Severe Thunderstorm Warning | GSP | 50 min |
| Jul 18, 6:17 PM EDT | Special Weather Statement | GSP | 28 min |
| Jul 23, 11:36 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 1:42 PM EDT | Severe Thunderstorm Warning | GSP | 28 min |
| Jul 27, 3:31 PM EDT | Special Weather Statement | GSP | 29 min |
| Aug 12, 5:23 PM EDT | Special Weather Statement | GSP | 67 min |
| Aug 12, 6:22 PM EDT | Special Weather Statement | GSP | 38 min |
| Aug 13, 8:27 PM EDT | Special Weather Statement | GSP | 33 min |
| Aug 14, 4:49 PM EDT | Special Weather Statement | GSP | 41 min |
| Aug 16, 4:03 PM EDT | Special Weather Statement | GSP | 27 min |
| Aug 16, 4:27 PM EDT | Severe Thunderstorm Warning | GSP | 20 min |
| Aug 17, 4:29 PM EDT | Special Weather Statement | GSP | 31 min |
| Sep 1, 2:28 PM EDT | Special Weather Statement | GSP | 47 min |
| Sep 5, 3:36 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Sep 5, 6:00 PM EDT | Special Weather Statement | GSP | 30 min |
| Sep 5, 6:46 PM EDT | Special Weather Statement | GSP | 29 min |
| Sep 10, 4:36 AM EDT | Flash Flood Watch | GSP | 47 hr |
| Sep 10, 5:30 AM EDT | High Wind Watch | GSP | 10 hr |
| Sep 10, 3:34 PM EDT | High Wind Warning | GSP | 31 hr |
| Sep 10, 3:34 PM EDT | Wind Advisory | GSP | 36 hr |
| Sep 12, 2:12 AM EDT | Areal Flood Advisory | GSP | 6 hr |
| Oct 7, 2:57 PM EDT | Flash Flood Watch | GSP | 37 hr |
| Oct 7, 3:03 PM EDT | Wind Advisory | GSP | 37 hr |
| Oct 8, 10:32 AM EDT | River Flood Warning | GSP | 3 days |
| Oct 8, 1:23 PM EDT | River Flood Warning | GSP | 40 hr |
| Oct 8, 2:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 8, 5:49 PM EDT | Severe Thunderstorm Warning | GSP | 41 min |
| Oct 8, 6:30 PM EDT | Areal Flood Advisory | GSP | 2 hr |
| Oct 9, 12:56 AM EDT | Areal Flood Advisory | GSP | 4 hr |
| Oct 17, 3:35 AM EDT | Frost Advisory | GSP | 29 hr |
| Oct 23, 12:08 PM EDT | Areal Flood Advisory | GSP | 6 hr |
| Oct 23, 12:27 PM EDT | Special Weather Statement | GSP | 33 min |
| Oct 23, 12:43 PM EDT | Areal Flood Advisory | GSP | 6 hr |
| Oct 23, 1:00 PM EDT | Special Weather Statement | GSP | 45 min |
| Oct 23, 1:47 PM EDT | Areal Flood Advisory | GSP | 6 hr |
| Oct 23, 2:02 PM EDT | Areal Flood Warning | GSP | 6 hr |
| Oct 23, 2:02 PM EDT | Special Weather Statement | GSP | 28 min |
| Oct 23, 2:07 PM EDT | River Flood Warning | GSP | 66 hr |
| Oct 23, 2:26 PM EDT | Areal Flood Warning | GSP | 6 hr |
| Oct 23, 2:44 PM EDT | Areal Flood Warning | GSP | 6 hr |
| Oct 23, 3:48 PM EDT | River Flood Warning | GSP | 30 hr |
| Oct 23, 7:03 PM EDT | Areal Flood Warning | GSP | 6 hr |
| Oct 24, 10:14 AM EDT | River Flood Advisory | GSP | 46 hr |
| Oct 24, 2:48 PM EDT | Frost Advisory | GSP | 18 hr |
| Oct 25, 3:13 AM EDT | Freeze Warning | GSP | 30 hr |
| Oct 28, 8:28 PM EDT | Areal Flood Advisory | GSP | 2 hr |
| Oct 28, 10:23 PM EDT | River Flood Advisory | GSP | 29 hr |
| Oct 28, 10:29 PM EDT | Areal Flood Advisory | GSP | 3 hr |
| Oct 28, 10:39 PM EDT | Areal Flood Advisory | GSP | 3 hr |
| Oct 29, 1:28 AM EDT | Areal Flood Advisory | GSP | 5 hr |
| Nov 18, 3:53 AM EST | Wind Advisory | GSP | 32 hr |
| 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 9, 2:45 PM EST | Winter Weather Advisory | GSP | 19 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.
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.