Alert archive / Virginia / Alleghany County
Weather alerts in Alleghany County, Virginia, 2016
134 weather alerts in 2016, 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 2016. Tap one for its archive.
- Alerts
- 134
- Warnings
- 17
- Watches
- 21
- Advisories
- 30
- Busiest month
- June32 alerts
- Busiest day
- June 23, 201612 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, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 5 | 38% | 3 | 100% | 15 min |
| Flash flood warnings | 2 | 2 | 0% | 9 | 100% | 92 min |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Blacksburg, VA: tornado warnings | 12 | 1 | 92% | 3 | 100% | 8 min |
| NWS Blacksburg, VA: severe thunderstorm warnings | 294 | 248 | 16% | 752 | 81% | 24 min |
| NWS Blacksburg, VA: flash flood warnings | 38 | 20 | 47% | 69 | 88% | 141 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 12, 3:45 AM EST | Wind Advisory | RNK | 20 hr |
| Jan 12, 3:11 PM EST | Special Weather Statement | RNK | 49 min |
| Jan 12, 4:57 PM EST | Special Weather Statement | RNK | 78 min |
| Jan 17, 4:40 AM EST | Wind Chill Advisory | RNK | 55 hr |
| Jan 20, 10:33 AM EST | Winter Storm Watch | RNK | 17 hr |
| Jan 21, 3:30 AM EST | Winter Storm Warning | RNK | 66 hr |
| Jan 22, 4:47 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 22, 8:56 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 22, 4:42 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 22, 6:06 PM EST | Special Weather Statement | RNK | 54 min |
| Jan 22, 6:47 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 23, 9:18 PM EST | Winter Weather Advisory | RNK | 9 hr |
| Feb 7, 3:09 PM EST | Winter Storm Watch | RNK | 25 hr |
| Feb 7, 3:09 PM EST | Winter Weather Advisory | RNK | 4 days |
| Feb 8, 6:52 PM EST | Special Weather Statement | RNK | 68 min |
| Feb 10, 3:28 AM EST | Wind Chill Advisory | RNK | 31 hr |
| Feb 12, 4:42 AM EST | Wind Chill Advisory | RNK | 48 hr |
| Feb 13, 2:30 PM EST | Winter Storm Watch | RNK | 14 hr |
| Feb 14, 8:01 AM EST | Winter Storm Warning | RNK | 51 hr |
| Feb 15, 9:52 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 15, 1:46 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 16, 3:33 AM EST | Special Weather Statement | RNK | 57 min |
| Feb 20, 3:40 PM EST | Flood Watch | RNK | 27 hr |
| Feb 23, 5:19 AM EST | Flood Watch | RNK | 36 hr |
| Feb 23, 2:46 PM EST | Wind Advisory | RNK | 64 hr |
| Mar 1, 4:42 AM EST | Wind Advisory | RNK | 27 hr |
| Mar 1, 10:36 PM EST | Special Weather Statement | RNK | 54 min |
| Mar 3, 6:30 AM EST | Winter Weather Advisory | RNK | 21 hr |
| Mar 3, 5:03 PM EST | Special Weather Statement | RNK | 57 min |
| Mar 14, 5:09 AM EDT | Dense Fog Advisory | RNK | 5 hr |
| Mar 23, 10:12 PM EDT | Fire Weather Watch | RNK | 6 hr |
| Mar 24, 4:10 AM EDT | Red Flag Warning | RNK | 16 hr |
| Apr 1, 3:52 PM EDT | Wind Advisory | RNK | 13 hr |
| Apr 2, 5:13 AM EDT | High Wind Warning | RNK | 25 hr |
| Apr 8, 7:42 AM EDT | Wind Advisory | RNK | 32 hr |
| Apr 26, 6:45 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 28, 3:56 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Apr 28, 4:21 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 28, 8:30 PM EDT | Special Weather Statement | RNK | 60 min |
| May 1, 7:30 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 1, 7:45 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 1, 8:32 PM EDT | Special Weather Statement | RNK | 28 min |
| May 1, 8:42 PM EDT | Severe Thunderstorm Warning | RNK | 33 min |
| May 1, 9:16 PM EDT | Special Weather Statement | RNK | 29 min |
| May 2, 1:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| May 2, 2:17 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 2, 6:20 PM EDT | Special Weather Statement | RNK | 25 min |
| May 10, 4:41 PM EDT | Special Weather Statement | RNK | 49 min |
| May 11, 12:27 AM EDT | Special Weather Statement | RNK | 33 min |
| May 11, 1:07 AM EDT | Special Weather Statement | RNK | 53 min |
| May 12, 9:06 PM EDT | Special Weather Statement | RNK | 54 min |
| May 15, 3:17 PM EDT | Frost Advisory | RNK | 18 hr |
| Jun 2, 5:09 PM EDT | Special Weather Statement | RNK | 66 min |
| Jun 4, 4:34 AM EDT | Flash Flood Watch | RNK | 19 hr |
| Jun 4, 8:21 PM EDT | Special Weather Statement | RNK | 69 min |
| Jun 15, 2:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 16, 1:58 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 16, 6:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 16, 7:50 PM EDT | Severe Thunderstorm Warning | RNK | 55 min |
| Jun 21, 12:55 PM EDT | Special Weather Statement | RNK | 65 min |
| Jun 21, 2:01 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 21, 3:53 PM EDT | Special Weather Statement | RNK | 52 min |
| Jun 21, 6:21 PM EDT | Special Weather Statement | RNK | 54 min |
| Jun 22, 5:09 PM EDT | Flash Flood Watch | RNK | 30 hr |
| Jun 23, 6:15 AM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 23, 6:39 AM EDT | Special Weather Statement | RNK | 81 min |
| Jun 23, 8:33 AM EDT | Severe Thunderstorm Warning | RNK | 57 min |
| Jun 23, 1:18 PM EDT | Flash Flood Warning | RNK | 10 hr |
| Jun 23, 1:22 PM EDT | Special Weather Statement | RNK | 23 min |
| Jun 23, 1:36 PM EDT | Severe Thunderstorm Warning | RNK | 54 min |
| Jun 23, 1:43 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 23, 2:33 PM EDT | Special Weather Statement | RNK | 27 min |
| Jun 23, 3:02 PM EDT | Special Weather Statement | RNK | 28 min |
| Jun 23, 3:52 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 23, 5:25 PM EDT | Special Weather Statement | RNK | 35 min |
| Jun 23, 6:09 PM EDT | River Flood Warning | RNK | 28 hr |
| Jun 23, 11:12 PM EDT | Areal Flood Warning | RNK | 18 hr |
| Jun 24, 11:32 AM EDT | Special Weather Statement | RNK | 58 min |
| Jun 24, 12:48 PM EDT | Special Weather Statement | RNK | 57 min |
| Jun 24, 4:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 2:35 PM EDT | Flash Flood Watch | RNK | 30 hr |
| Jun 27, 5:57 PM EDT | Special Weather Statement | RNK | 93 min |
| Jun 27, 6:22 PM EDT | Flash Flood Warning | RNK | 4 hr |
| Jun 27, 10:17 PM EDT | Areal Flood Warning | RNK | 6 hr |
| Jul 3, 3:03 PM EDT | Flash Flood Watch | RNK | 37 hr |
| Jul 4, 10:41 AM EDT | Special Weather Statement | RNK | 49 min |
| Jul 4, 5:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 4, 9:59 PM EDT | Severe Thunderstorm Warning | RNK | 49 min |
| Jul 8, 3:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jul 8, 4:57 PM EDT | Severe Thunderstorm Warning | RNK | 63 min |
| Jul 12, 3:08 PM EDT | Special Weather Statement | RNK | 37 min |
| Jul 12, 7:40 PM EDT | Special Weather Statement | RNK | 65 min |
| Jul 13, 1:20 PM EDT | Special Weather Statement | RNK | 25 min |
| Jul 14, 2:01 PM EDT | Special Weather Statement | RNK | 29 min |
| Jul 16, 2:26 PM EDT | Special Weather Statement | RNK | 64 min |
| Jul 22, 4:22 PM EDT | Special Weather Statement | RNK | 23 min |
| Jul 26, 9:33 PM EDT | Special Weather Statement | RNK | 42 min |
| Jul 27, 1:45 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 28, 1:28 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 28, 2:08 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jul 28, 4:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 28, 5:12 PM EDT | Severe Thunderstorm Warning | RNK | 52 min |
| Jul 28, 6:52 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 28, 9:22 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Aug 12, 5:16 PM EDT | Special Weather Statement | RNK | 29 min |
| Aug 14, 4:13 PM EDT | Special Weather Statement | RNK | 47 min |
| Aug 15, 1:58 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Aug 16, 9:04 PM EDT | Special Weather Statement | RNK | 41 min |
| Aug 17, 1:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 17, 2:02 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 20, 5:09 AM EDT | Dense Fog Advisory | RNK | 4 hr |
| Sep 26, 1:58 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 26, 5:23 PM EDT | Special Weather Statement | RNK | 67 min |
| Sep 29, 1:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Sep 29, 4:40 PM EDT | Severe Thunderstorm Warning | RNK | 47 min |
| Sep 29, 5:09 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Sep 29, 7:42 PM EDT | Flash Flood Watch | RNK | 8 hr |
| Sep 29, 8:30 PM EDT | Areal Flood Advisory | RNK | 4 hr |
| Sep 30, 12:01 AM EDT | Areal Flood Advisory | RNK | 6 hr |
| Sep 30, 11:59 AM EDT | Flash Flood Watch | RNK | 6 hr |
| Sep 30, 12:23 PM EDT | Areal Flood Advisory | RNK | 8 hr |
| Oct 9, 4:46 AM EDT | Wind Advisory | RNK | 13 hr |
| Oct 10, 2:06 PM EDT | Frost Advisory | RNK | 19 hr |
| Oct 21, 3:49 PM EDT | Wind Advisory | RNK | 20 hr |
| Nov 19, 3:41 AM EST | Wind Advisory | RNK | 51 hr |
| Nov 30, 12:56 PM EST | Special Weather Statement | RNK | 64 min |
| Dec 14, 5:25 AM EST | Wind Chill Advisory | RNK | 49 hr |
| Dec 14, 5:40 AM EST | Wind Advisory | RNK | 30 hr |
| Dec 16, 2:24 PM EST | Freezing Rain Advisory | RNK | 19 hr |
| Dec 17, 9:04 AM EST | Freezing Rain Advisory | RNK | 116 min |
| Dec 17, 7:38 PM EST | Wind Advisory | RNK | 15 hr |
| Dec 28, 2:17 PM EST | Wind Advisory | RNK | 52 hr |
| Dec 28, 2:37 PM EST | Winter Weather Advisory | RNK | 51 hr |
| Dec 28, 8:59 PM EST | Freezing Rain Advisory | RNK | 9 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 archive20152017
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.