Alert archive / Virginia / Alleghany County
Weather alerts in Alleghany County, Virginia, 2015
147 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Alleghany County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 147
- Warnings
- 17
- Watches
- 28
- Advisories
- 35
- Busiest month
- June34 alerts
- Busiest day
- June 27, 20157 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Alleghany County, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 8 | 0% | 5 | 60% | 6 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Blacksburg, VA: tornado warnings | 1 | 0 | 100% | 0 | ||
| NWS Blacksburg, VA: severe thunderstorm warnings | 146 | 122 | 16% | 435 | 76% | 23 min |
| NWS Blacksburg, VA: flash flood warnings | 30 | 18 | 40% | 55 | 84% | 80 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 4, 12:13 PM EST | Wind Advisory | RNK | 24 hr |
| Jan 6, 2:40 PM EST | Wind Chill Advisory | RNK | 45 hr |
| Jan 9, 1:42 AM EST | Wind Advisory | RNK | 10 hr |
| Jan 9, 3:39 AM EST | Wind Chill Advisory | RNK | 30 hr |
| Jan 11, 2:29 PM EST | Freezing Rain Advisory | RNK | 21 hr |
| Jan 11, 8:50 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 13, 3:13 AM EST | Winter Weather Advisory | RNK | 33 hr |
| Jan 22, 3:22 PM EST | Winter Weather Advisory | RNK | 43 hr |
| Jan 25, 2:37 PM EST | Winter Weather Advisory | RNK | 43 hr |
| Jan 29, 4:05 PM EST | Wind Advisory | RNK | 32 hr |
| Feb 1, 3:28 PM EST | Wind Advisory | RNK | 31 hr |
| Feb 11, 4:03 AM EST | Freezing Fog Advisory | RNK | 5 hr |
| Feb 11, 3:30 PM EST | Wind Advisory | RNK | 32 hr |
| Feb 12, 4:08 AM EST | Wind Chill Advisory | RNK | 30 hr |
| Feb 13, 4:52 AM EST | Wind Chill Watch | RNK | 24 hr |
| Feb 13, 4:56 AM EST | High Wind Watch | RNK | 16 hr |
| Feb 13, 10:08 AM EST | Wind Chill Advisory | RNK | 112 min |
| Feb 13, 9:13 PM EST | High Wind Warning | RNK | 34 hr |
| Feb 14, 4:28 AM EST | Wind Advisory | RNK | 32 hr |
| Feb 14, 4:29 AM EST | Wind Chill Warning | RNK | 48 hr |
| Feb 14, 4:29 AM EST | Wind Chill Advisory | RNK | 48 hr |
| Feb 15, 3:46 PM EST | Winter Storm Warning | RNK | 37 hr |
| Feb 16, 9:51 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 16, 4:30 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 17, 3:09 PM EST | Wind Chill Watch | RNK | 13 hr |
| Feb 17, 3:09 PM EST | Winter Weather Advisory | RNK | 36 hr |
| Feb 18, 4:10 AM EST | Wind Chill Warning | RNK | 54 hr |
| Feb 19, 3:24 PM EST | Winter Storm Watch | RNK | 14 hr |
| Feb 20, 5:05 AM EST | Winter Storm Warning | RNK | 49 hr |
| Feb 21, 10:32 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 25, 3:01 AM EST | Winter Weather Advisory | RNK | 30 hr |
| Feb 28, 3:16 PM EST | Winter Weather Advisory | RNK | 24 hr |
| Mar 2, 3:36 PM EST | Winter Weather Advisory | RNK | 21 hr |
| Mar 4, 4:13 AM EST | Winter Storm Warning | RNK | 39 hr |
| Mar 4, 4:13 AM EST | Winter Weather Advisory | RNK | 39 hr |
| Mar 5, 7:58 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Mar 5, 11:55 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Mar 5, 7:58 PM EST | Wind Chill Advisory | RNK | 12 hr |
| Mar 9, 3:39 PM EDT | Flood Watch | RNK | 47 hr |
| Mar 14, 3:20 PM EDT | Wind Advisory | RNK | 25 hr |
| Mar 26, 6:01 PM EDT | Special Weather Statement | RNK | 59 min |
| Mar 31, 3:45 AM EDT | Red Flag Warning | RNK | 16 hr |
| Apr 3, 6:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Apr 3, 8:42 PM EDT | Special Weather Statement | RNK | 63 min |
| Apr 3, 8:43 PM EDT | Wind Advisory | RNK | 17 hr |
| Apr 8, 1:51 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Apr 8, 2:43 PM EDT | Special Weather Statement | RNK | 62 min |
| Apr 8, 3:28 PM EDT | Special Weather Statement | RNK | 62 min |
| Apr 8, 4:30 PM EDT | Special Weather Statement | RNK | 45 min |
| Apr 9, 12:37 AM EDT | Special Weather Statement | RNK | 53 min |
| Apr 10, 10:16 AM EDT | Special Weather Statement | RNK | 59 min |
| Apr 10, 3:52 PM EDT | Special Weather Statement | RNK | 23 min |
| Apr 13, 3:52 PM EDT | Flood Watch | RNK | 28 hr |
| Apr 18, 3:42 PM EDT | Flood Watch | RNK | 33 hr |
| Apr 20, 1:54 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Apr 20, 2:55 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 20, 6:38 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Apr 20, 6:41 PM EDT | Special Weather Statement | RNK | 34 min |
| Apr 22, 4:38 AM EDT | Wind Advisory | RNK | 14 hr |
| Apr 22, 12:32 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Apr 23, 3:56 AM EDT | Freeze Warning | RNK | 28 hr |
| Apr 27, 3:31 PM EDT | Frost Advisory | RNK | 17 hr |
| May 1, 1:30 PM EDT | Special Weather Statement | RNK | 60 min |
| May 1, 2:43 PM EDT | Special Weather Statement | RNK | 62 min |
| May 1, 3:59 PM EDT | Special Weather Statement | RNK | 61 min |
| May 11, 8:40 PM EDT | Special Weather Statement | RNK | 65 min |
| May 11, 9:11 PM EDT | Special Weather Statement | RNK | 64 min |
| May 26, 4:07 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| May 31, 4:06 PM EDT | Special Weather Statement | RNK | 24 min |
| May 31, 4:21 PM EDT | Special Weather Statement | RNK | 39 min |
| May 31, 7:56 PM EDT | Special Weather Statement | RNK | 49 min |
| Jun 1, 2:51 PM EDT | Severe Thunderstorm Warning | RNK | 39 min |
| Jun 1, 3:31 PM EDT | Special Weather Statement | RNK | 59 min |
| Jun 1, 3:52 PM EDT | Severe Thunderstorm Warning | RNK | 38 min |
| Jun 2, 7:27 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Jun 8, 2:40 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 8, 5:35 PM EDT | Special Weather Statement | RNK | 40 min |
| Jun 13, 2:06 PM EDT | Special Weather Statement | RNK | 54 min |
| Jun 16, 12:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 12:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 3:40 PM EDT | Special Weather Statement | RNK | 65 min |
| Jun 18, 2:28 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 19, 3:26 PM EDT | Flash Flood Watch | RNK | 29 hr |
| Jun 20, 1:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Jun 20, 3:26 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 20, 3:50 PM EDT | Severe Thunderstorm Warning | RNK | 38 min |
| Jun 21, 3:23 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 23, 4:09 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 23, 5:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 23, 6:33 PM EDT | Special Weather Statement | RNK | 57 min |
| Jun 23, 7:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jun 25, 4:50 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 26, 6:11 AM EDT | Special Weather Statement | RNK | 64 min |
| Jun 26, 7:17 AM EDT | Special Weather Statement | RNK | 43 min |
| Jun 26, 9:58 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 26, 11:51 PM EDT | Flash Flood Watch | RNK | 18 hr |
| Jun 27, 2:08 AM EDT | Special Weather Statement | RNK | 67 min |
| Jun 27, 2:54 AM EDT | Special Weather Statement | RNK | 21 min |
| Jun 27, 3:19 AM EDT | Special Weather Statement | RNK | 56 min |
| Jun 27, 1:29 PM EDT | Special Weather Statement | RNK | 46 min |
| Jun 27, 3:24 PM EDT | Wind Advisory | RNK | 23 hr |
| Jun 30, 12:55 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 30, 2:22 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 30, 3:48 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 30, 7:58 PM EDT | Special Weather Statement | RNK | 32 min |
| Jun 30, 10:22 PM EDT | Severe Thunderstorm Warning | RNK | 53 min |
| Jul 5, 4:35 AM EDT | Flash Flood Watch | RNK | 25 hr |
| Jul 5, 9:03 PM EDT | Special Weather Statement | RNK | 27 min |
| Jul 5, 10:01 PM EDT | Special Weather Statement | RNK | 29 min |
| Jul 6, 2:26 AM EDT | Special Weather Statement | RNK | 64 min |
| Jul 6, 3:30 AM EDT | Special Weather Statement | RNK | 60 min |
| Jul 8, 3:47 PM EDT | Flash Flood Watch | RNK | 5 hr |
| Jul 12, 11:06 PM EDT | Special Weather Statement | RNK | 54 min |
| Jul 13, 3:36 PM EDT | Flash Flood Watch | RNK | 16 hr |
| Jul 13, 4:07 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 13, 5:45 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 13, 6:23 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 13, 7:09 PM EDT | Severe Thunderstorm Warning | RNK | 66 min |
| Jul 13, 8:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 14, 6:10 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 14, 6:38 PM EDT | Severe Thunderstorm Warning | RNK | 67 min |
| Jul 14, 6:44 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 14, 7:51 PM EDT | Severe Thunderstorm Warning | RNK | 54 min |
| Jul 28, 6:18 PM EDT | Areal Flood Advisory | RNK | 6 hr |
| Aug 10, 3:06 PM EDT | Special Weather Statement | RNK | 54 min |
| Aug 10, 3:58 PM EDT | Special Weather Statement | RNK | 62 min |
| Aug 10, 7:37 PM EDT | Special Weather Statement | RNK | 53 min |
| Aug 10, 8:29 PM EDT | Special Weather Statement | RNK | 61 min |
| Aug 18, 4:20 PM EDT | Special Weather Statement | RNK | 55 min |
| Aug 19, 6:19 PM EDT | Special Weather Statement | RNK | 41 min |
| Sep 3, 4:31 PM EDT | Special Weather Statement | RNK | 59 min |
| Sep 4, 3:08 PM EDT | Severe Thunderstorm Warning | RNK | 67 min |
| Sep 29, 4:44 AM EDT | Flash Flood Watch | RNK | 25 hr |
| Sep 29, 6:58 AM EDT | Special Weather Statement | RNK | 92 min |
| Sep 29, 1:25 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Oct 1, 5:05 AM EDT | Flash Flood Watch | RNK | 70 hr |
| Oct 2, 4:27 AM EDT | High Wind Watch | RNK | 12 hr |
| Oct 2, 4:16 PM EDT | Wind Advisory | RNK | 68 hr |
| Oct 9, 6:15 PM EDT | Special Weather Statement | RNK | 60 min |
| Oct 16, 3:59 AM EDT | Freeze Watch | RNK | 24 hr |
| Oct 17, 3:31 AM EDT | Freeze Watch | RNK | 35 hr |
| Oct 17, 3:31 AM EDT | Freeze Warning | RNK | 29 hr |
| Oct 28, 7:33 PM EDT | Special Weather Statement | RNK | 27 min |
| Nov 12, 3:42 AM EST | Wind Advisory | RNK | 50 hr |
| Dec 22, 3:28 PM EST | Flash Flood Watch | RNK | 28 hr |
| Dec 24, 2:33 PM EST | Flash Flood Watch | RNK | 31 hr |
| Dec 25, 5:25 AM EST | Dense Fog Advisory | RNK | 4 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 archive20142016
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.