Alert archive / North Carolina / Alexander County
Weather alerts in Alexander County, North Carolina, 2017
131 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 131
- Warnings
- 28
- Watches
- 18
- Advisories
- 29
- Busiest month
- March26 alerts
- Busiest day
- May 24, 20175 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 Alexander County in 2017 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 20 minutes after it went out.
Alexander County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 1 | 75% | 1 | 100% | 20 min |
| Severe thunderstorm warnings | 12 | 10 | 17% | 10 | 40% | 30 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, 3:18 AM EST | Mesoscale Discussion | SPC | 5 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 21, 3:31 AM EST | Dense Fog Advisory | GSP | 8 hr |
| Feb 8, 4:11 AM EST | Dense Fog Advisory | GSP | 6 hr |
| Feb 8, 7:19 PM EST | Special Weather Statement | GSP | 26 min |
| Feb 12, 3:51 AM EST | Wind Advisory | GSP | 33 hr |
| Feb 23, 2:55 AM EST | Dense Fog Advisory | GSP | 7 hr |
| Mar 1, 2:07 PM EST | Mesoscale Discussion | SPC | 113 min |
| Mar 1, 3:02 PM EST | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 1, 5:07 PM EST | Tornado Warning | GSP | 38 min |
| Mar 2, 3:13 PM EST | Freeze Watch | GSP | 13 hr |
| Mar 3, 4:22 AM EST | Freeze Warning | GSP | 29 hr |
| Mar 3, 2:57 PM EST | Freeze Watch | GSP | 18 hr |
| Mar 4, 9:10 AM EST | Freeze Warning | GSP | 24 hr |
| Mar 9, 3:47 PM EST | Freeze Watch | GSP | 12 hr |
| Mar 10, 3:53 AM EST | Freeze Warning | GSP | 29 hr |
| Mar 10, 3:33 PM EST | Winter Weather Advisory | GSP | 42 hr |
| Mar 11, 3:20 PM EST | Freeze Watch | GSP | 12 hr |
| Mar 12, 4:06 AM EDT | Freeze Warning | GSP | 30 hr |
| Mar 12, 3:47 PM EDT | Freeze Watch | GSP | 12 hr |
| Mar 13, 3:53 AM EDT | Freeze Watch | GSP | 24 hr |
| Mar 14, 3:25 AM EDT | Freeze Watch | GSP | 25 hr |
| Mar 14, 3:25 AM EDT | Freeze Warning | GSP | 32 hr |
| Mar 15, 3:55 AM EDT | Freeze Warning | GSP | 31 hr |
| Mar 15, 9:59 PM EDT | Freeze Watch | GSP | 6 hr |
| Mar 16, 3:31 AM EDT | Freeze Warning | GSP | 30 hr |
| Mar 19, 4:10 AM EDT | Freeze Warning | GSP | 29 hr |
| Mar 22, 3:50 AM EDT | Freeze Warning | GSP | 29 hr |
| Mar 27, 5:36 PM EDT | Severe Thunderstorm Warning | GSP | 39 min |
| Mar 27, 6:15 PM EDT | Special Weather Statement | GSP | 60 min |
| Mar 31, 6:06 AM EDT | Special Weather Statement | GSP | 39 min |
| Mar 31, 6:47 AM EDT | Special Weather Statement | GSP | 73 min |
| Mar 31, 2:06 PM EDT | Special Weather Statement | GSP | 39 min |
| Apr 5, 3:31 PM EDT | Wind Advisory | GSP | 52 hr |
| Apr 5, 11:50 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 6, 12:52 AM EDT | Severe Thunderstorm Warning | GSP | 38 min |
| Apr 6, 3:25 PM EDT | Freeze Watch | GSP | 23 hr |
| Apr 7, 2:54 PM EDT | Frost Advisory | GSP | 18 hr |
| Apr 8, 2:37 PM EDT | Frost Advisory | GSP | 18 hr |
| Apr 21, 2:13 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 21, 4:19 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Apr 22, 5:55 AM EDT | Dense Fog Advisory | GSP | 3 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, 10:34 PM EDT | Special Weather Statement | GSP | 41 min |
| Apr 24, 2:42 PM EDT | Areal Flood Advisory | GSP | 9 hr |
| Apr 28, 6:37 AM EDT | Dense Fog Advisory | GSP | 3 hr |
| May 1, 4:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| May 4, 10:33 PM EDT | Special Weather Statement | GSP | 42 min |
| May 9, 8:25 PM EDT | Special Weather Statement | GSP | 50 min |
| May 11, 4:47 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 19, 2:24 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 22, 1:54 PM EDT | Flash Flood Watch | GSP | 36 hr |
| May 23, 6:37 AM EDT | Areal Flood Advisory | GSP | 113 min |
| 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, 4:15 PM EDT | Tornado Warning | GSP | 31 min |
| May 24, 5:25 PM EDT | Mesoscale Discussion | SPC | 65 min |
| May 27, 6:11 PM EDT | Mesoscale Discussion | SPC | 64 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, 10:57 PM EDT | Special Weather Statement | GSP | 48 min |
| May 28, 1:38 AM EDT | Special Weather Statement | GSP | 52 min |
| Jun 4, 3:15 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 4, 3:32 PM EDT | Special Weather Statement | GSP | 43 min |
| Jun 13, 3:24 PM EDT | Severe Thunderstorm Warning | GSP | 51 min |
| Jun 13, 4:25 PM EDT | Severe Thunderstorm Warning | GSP | 50 min |
| Jun 14, 1:17 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 16, 1:27 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 16, 4:46 PM EDT | Special Weather Statement | GSP | 29 min |
| Jun 16, 5:12 PM EDT | Special Weather Statement | GSP | 33 min |
| Jun 16, 5:17 PM EDT | Special Weather Statement | GSP | 28 min |
| Jul 1, 1:29 PM EDT | Special Weather Statement | GSP | 91 min |
| Jul 1, 1:44 PM EDT | Severe Thunderstorm Warning | GSP | 61 min |
| Jul 1, 4:07 PM EDT | Special Weather Statement | GSP | 23 min |
| Jul 3, 3:51 PM EDT | Special Weather Statement | GSP | 39 min |
| Jul 4, 2:12 PM EDT | Special Weather Statement | GSP | 63 min |
| Jul 4, 3:43 PM EDT | Special Weather Statement | GSP | 47 min |
| Jul 5, 3:39 PM EDT | Severe Thunderstorm Warning | GSP | 51 min |
| Jul 6, 5:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jul 9, 3:26 AM EDT | Dense Fog Advisory | GSP | 7 hr |
| Jul 13, 4:09 PM EDT | Special Weather Statement | GSP | 51 min |
| Jul 13, 4:28 PM EDT | Severe Thunderstorm Warning | GSP | 47 min |
| Jul 13, 6:06 PM EDT | Severe Thunderstorm Warning | GSP | 39 min |
| Jul 13, 6:48 PM EDT | Special Weather Statement | GSP | 27 min |
| Jul 14, 3:05 PM EDT | Special Weather Statement | GSP | 25 min |
| Jul 14, 3:37 PM EDT | Special Weather Statement | GSP | 23 min |
| Jul 15, 3:32 PM EDT | Special Weather Statement | GSP | 28 min |
| Jul 15, 4:27 PM EDT | Severe Thunderstorm Warning | GSP | 48 min |
| Jul 17, 4:43 PM EDT | Severe Thunderstorm Warning | GSP | 47 min |
| Jul 17, 5:23 PM EDT | Severe Thunderstorm Warning | GSP | 52 min |
| Jul 18, 2:31 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jul 23, 11:36 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 27, 3:28 PM EDT | Special Weather Statement | GSP | 32 min |
| Jul 28, 3:26 PM EDT | Special Weather Statement | GSP | 34 min |
| Jul 28, 3:58 PM EDT | Special Weather Statement | GSP | 32 min |
| Jul 28, 4:26 PM EDT | Special Weather Statement | GSP | 34 min |
| Aug 4, 7:32 PM EDT | Special Weather Statement | GSP | 43 min |
| Aug 15, 7:52 AM EDT | Dense Fog Advisory | GSP | 92 min |
| Aug 17, 7:04 PM EDT | Areal Flood Advisory | GSP | 116 min |
| Sep 1, 1:49 PM EDT | Tornado Watch | SPC | 8 hr |
| Sep 1, 4:53 PM EDT | Special Weather Statement | GSP | 52 min |
| Sep 1, 5:16 PM EDT | Severe Thunderstorm Warning | GSP | 44 min |
| Sep 1, 7:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Sep 5, 3:36 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Sep 5, 4:56 PM EDT | Special Weather Statement | GSP | 34 min |
| Sep 5, 5:29 PM EDT | Special Weather Statement | GSP | 31 min |
| Sep 10, 3:34 PM EDT | Wind Advisory | GSP | 36 hr |
| Oct 15, 5:08 AM EDT | Dense Fog Advisory | GSP | 5 hr |
| Oct 17, 3:35 AM EDT | Frost Advisory | GSP | 29 hr |
| Oct 23, 1:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Oct 23, 2:00 PM EDT | Tornado Watch | SPC | 8 hr |
| Oct 23, 4:25 PM EDT | Tornado Warning | GSP | 35 min |
| Oct 23, 4:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Oct 23, 4:50 PM EDT | Tornado Warning | GSP | 14 min |
| Oct 25, 3:13 AM EDT | Frost Advisory | GSP | 30 hr |
| Oct 26, 2:54 PM EDT | Frost Advisory | GSP | 18 hr |
| Oct 29, 4:29 AM EDT | Freeze Warning | GSP | 30 hr |
| Nov 13, 5:15 AM EST | Dense Fog Advisory | GSP | 6 hr |
| Nov 22, 3:50 AM EST | Dense Fog Advisory | GSP | 5 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 19, 5:02 AM EST | Dense Fog Advisory | GSP | 5 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 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 22 |
| Special Weather Statement | 34 |
| Flooding | |
| Flash Flood Watch | 2 |
| Flood Watch | 1 |
| Areal Flood Advisory | 3 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Weather Advisory | 6 |
| Cold | |
| Freeze Warning | 10 |
| Freeze Watch | 9 |
| Frost Advisory | 5 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 11 |
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.