Alert archive / Virginia / Alleghany County
Weather alerts in Alleghany County, Virginia, 2011
174 weather alerts in 2011, 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 2011. Tap one for its archive.
- Alerts
- 174
- Warnings
- 56
- Watches
- 29
- Advisories
- 32
- Busiest month
- April34 alerts
- Busiest day
- April 28, 201114 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 3 tornado warnings covering Alleghany County in 2011 had a tornado report inside them.
Alleghany County, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 33 | 25 | 24% | 13 | 92% | 16 min |
| Flash flood warnings | 5 | 4 | 20% | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Blacksburg, VA: tornado warnings | 78 | 7 | 91% | 17 | 76% | 9 min |
| NWS Blacksburg, VA: severe thunderstorm warnings | 576 | 456 | 21% | 1,384 | 77% | 23 min |
| NWS Blacksburg, VA: flash flood warnings | 89 | 45 | 49% | 125 | 82% | 96 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 8, 6:04 PM EST | Wind Chill Advisory | RNK | 16 hr |
| Jan 10, 4:44 AM EST | Winter Weather Advisory | RNK | 3 days |
| Jan 11, 5:55 PM EST | Wind Advisory | RNK | 24 hr |
| Jan 17, 3:55 PM EST | Winter Weather Advisory | RNK | 17 hr |
| Jan 20, 4:00 PM EST | Wind Advisory | RNK | 12 hr |
| Jan 25, 4:25 AM EST | Winter Storm Watch | RNK | 11 hr |
| Jan 25, 3:31 PM EST | Winter Storm Warning | RNK | 29 hr |
| Jan 26, 11:19 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 27, 3:23 PM EST | Winter Weather Advisory | RNK | 23 hr |
| Feb 1, 3:19 PM EST | Wind Advisory | RNK | 37 hr |
| Feb 3, 3:45 PM EST | Freezing Rain Advisory | RNK | 41 hr |
| Feb 5, 2:56 PM EST | Wind Advisory | RNK | 9 hr |
| Feb 7, 4:00 PM EST | Wind Advisory | RNK | 20 hr |
| Feb 13, 1:08 PM EST | Fire Weather Watch | RNK | 15 hr |
| Feb 14, 3:46 AM EST | Red Flag Warning | RNK | 17 hr |
| Feb 14, 4:09 AM EST | Wind Advisory | RNK | 19 hr |
| Feb 18, 4:08 AM EST | Fire Weather Watch | RNK | 11 hr |
| Feb 18, 3:33 PM EST | Red Flag Warning | RNK | 29 hr |
| Feb 18, 3:49 PM EST | Wind Advisory | RNK | 27 hr |
| Feb 21, 3:12 AM EST | Wind Advisory | RNK | 6 hr |
| Feb 24, 3:36 PM EST | Wind Advisory | RNK | 27 hr |
| Feb 25, 1:48 AM EST | Mesoscale Discussion | SPC | 27 min |
| Feb 28, 8:36 AM EST | Mesoscale Discussion | SPC | 24 min |
| Feb 28, 8:57 AM EST | Tornado Watch | SPC | 9 hr |
| Mar 5, 3:43 AM EST | Flood Watch | RNK | 39 hr |
| Mar 6, 10:09 AM EST | Areal Flood Warning | RNK | 6 hr |
| Mar 6, 3:45 PM EST | Areal Flood Warning | RNK | 8 hr |
| Mar 7, 4:17 AM EST | Areal Flood Warning | RNK | 6 hr |
| Mar 8, 4:20 AM EST | Flood Watch | RNK | 63 hr |
| Mar 10, 1:25 PM EST | Severe Thunderstorm Watch | SPC | 7 hr |
| Mar 15, 10:09 AM EDT | Special Weather Statement | RNK | 6 min |
| Mar 21, 10:25 PM EDT | Severe Thunderstorm Warning | RNK | 50 min |
| Mar 23, 3:45 PM EDT | Tornado Watch | SPC | 6 hr |
| Mar 23, 3:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Mar 23, 4:37 PM EDT | Severe Thunderstorm Warning | RNK | 43 min |
| Mar 23, 4:48 PM EDT | Severe Thunderstorm Warning | RNK | 57 min |
| Mar 23, 6:43 PM EDT | Severe Thunderstorm Warning | RNK | 62 min |
| Mar 23, 7:34 PM EDT | Special Weather Statement | RNK | 56 min |
| Mar 23, 8:39 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Mar 24, 1:30 AM EDT | Special Weather Statement | RNK | 60 min |
| Mar 24, 3:45 AM EDT | Wind Advisory | RNK | 8 hr |
| Mar 25, 2:45 PM EDT | Winter Storm Watch | RNK | 14 hr |
| Mar 26, 4:20 AM EDT | Winter Weather Advisory | RNK | 29 hr |
| Apr 1, 3:46 PM EDT | Wind Advisory | RNK | 26 hr |
| Apr 3, 4:03 PM EDT | Wind Advisory | RNK | 37 hr |
| Apr 5, 1:33 AM EDT | Severe Thunderstorm Warning | RNK | 57 min |
| Apr 12, 10:48 AM EDT | Special Weather Statement | RNK | 42 min |
| Apr 12, 12:43 PM EDT | Special Weather Statement | RNK | 47 min |
| Apr 12, 2:19 PM EDT | Special Weather Statement | RNK | 56 min |
| Apr 12, 3:29 PM EDT | Flash Flood Warning | RNK | 6 hr |
| Apr 12, 9:16 PM EDT | Areal Flood Warning | RNK | 12 hr |
| Apr 15, 4:33 AM EDT | Wind Advisory | RNK | 59 hr |
| Apr 15, 4:34 AM EDT | Flash Flood Watch | RNK | 36 hr |
| Apr 16, 11:27 AM EDT | Special Weather Statement | RNK | 63 min |
| Apr 16, 12:16 PM EDT | Severe Thunderstorm Warning | RNK | 59 min |
| Apr 16, 12:24 PM EDT | Flash Flood Warning | RNK | 4 hr |
| Apr 16, 1:06 PM EDT | Severe Thunderstorm Warning | RNK | 54 min |
| Apr 26, 1:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Apr 26, 2:09 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 26, 4:34 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Apr 26, 7:44 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Apr 27, 1:23 PM EDT | Tornado Watch | SPC | 5 hr |
| Apr 27, 6:15 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 27, 9:06 PM EDT | Flash Flood Watch | RNK | 13 hr |
| Apr 27, 10:12 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Apr 27, 11:56 PM EDT | Tornado Warning | RNK | 49 min |
| Apr 28, 12:27 AM EDT | Mesoscale Discussion | SPC | 63 min |
| Apr 28, 12:41 AM EDT | Tornado Watch | SPC | 7 hr |
| Apr 28, 12:48 AM EDT | Flash Flood Warning | RNK | 6 hr |
| Apr 28, 1:03 AM EDT | Severe Thunderstorm Warning | RNK | 57 min |
| Apr 28, 1:28 AM EDT | Severe Thunderstorm Warning | RNK | 21 min |
| Apr 28, 1:34 AM EDT | Tornado Warning | RNK | 41 min |
| Apr 28, 1:43 AM EDT | Tornado Warning | RNK | 19 min |
| Apr 28, 3:22 AM EDT | Flash Flood Warning | RNK | 4 hr |
| Apr 28, 6:47 AM EDT | Areal Flood Warning | RNK | 6 hr |
| Apr 28, 8:09 AM EDT | Areal Flood Warning | RNK | 10 hr |
| Apr 28, 6:33 PM EDT | Areal Flood Warning | RNK | 6 hr |
| May 3, 3:52 PM EDT | Frost Advisory | RNK | 41 hr |
| May 10, 6:49 PM EDT | Severe Thunderstorm Warning | RNK | 56 min |
| May 10, 8:04 PM EDT | Special Weather Statement | RNK | 56 min |
| May 12, 1:11 PM EDT | Severe Thunderstorm Warning | RNK | 46 min |
| May 12, 2:23 PM EDT | Special Weather Statement | RNK | 67 min |
| May 13, 3:16 PM EDT | Flash Flood Watch | RNK | 6 hr |
| May 17, 4:03 AM EDT | Flash Flood Watch | RNK | 24 hr |
| May 17, 4:55 PM EDT | Special Weather Statement | RNK | 50 min |
| May 23, 3:16 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 24, 8:34 AM EDT | Mesoscale Discussion | SPC | 116 min |
| May 24, 10:00 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 26, 1:15 PM EDT | Mesoscale Discussion | SPC | 90 min |
| May 26, 1:42 PM EDT | Severe Thunderstorm Watch | SPC | 11 hr |
| May 26, 4:30 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 26, 5:00 PM EDT | Severe Thunderstorm Warning | RNK | 60 min |
| May 26, 8:57 PM EDT | Severe Thunderstorm Warning | RNK | 63 min |
| May 26, 10:25 PM EDT | Severe Thunderstorm Warning | RNK | 48 min |
| May 26, 10:36 PM EDT | Flash Flood Warning | RNK | 6 hr |
| May 27, 12:40 AM EDT | Severe Thunderstorm Warning | RNK | 50 min |
| May 27, 6:08 AM EDT | Flash Flood Watch | RNK | 16 hr |
| Jun 1, 4:35 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jun 5, 2:28 AM EDT | Special Weather Statement | RNK | 32 min |
| Jun 5, 4:59 PM EDT | Special Weather Statement | RNK | 61 min |
| Jun 5, 5:21 PM EDT | Severe Thunderstorm Warning | RNK | 54 min |
| Jun 9, 6:17 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 9, 9:06 PM EDT | Special Weather Statement | RNK | 54 min |
| Jun 9, 9:14 PM EDT | Severe Thunderstorm Warning | RNK | 31 min |
| Jun 10, 1:16 PM EDT | Severe Thunderstorm Warning | RNK | 59 min |
| Jun 10, 2:54 PM EDT | Severe Thunderstorm Warning | RNK | 54 min |
| Jun 12, 1:48 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 17, 1:39 PM EDT | Severe Thunderstorm Warning | RNK | 55 min |
| Jun 18, 4:46 PM EDT | Special Weather Statement | RNK | 59 min |
| Jun 20, 2:36 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jun 21, 2:11 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 21, 7:16 PM EDT | Severe Thunderstorm Warning | RNK | 59 min |
| Jun 21, 7:40 PM EDT | Severe Thunderstorm Warning | RNK | 65 min |
| Jun 21, 8:46 PM EDT | Severe Thunderstorm Warning | RNK | 19 min |
| Jun 28, 2:44 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jul 4, 12:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 4, 1:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 4, 2:27 PM EDT | Severe Thunderstorm Warning | RNK | 63 min |
| Jul 4, 2:48 PM EDT | Flash Flood Watch | RNK | 4 hr |
| Jul 5, 3:38 AM EDT | Dense Fog Advisory | RNK | 5 hr |
| Jul 8, 3:58 AM EDT | Flash Flood Watch | RNK | 19 hr |
| Jul 11, 5:54 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 11, 6:05 PM EDT | Severe Thunderstorm Warning | RNK | 55 min |
| Jul 11, 6:59 PM EDT | Special Weather Statement | RNK | 61 min |
| Jul 19, 9:37 AM EDT | Special Weather Statement | RNK | 53 min |
| Jul 20, 2:21 PM EDT | Heat Advisory | RNK | 30 hr |
| Jul 20, 4:39 PM EDT | Special Weather Statement | RNK | 36 min |
| Jul 21, 3:28 PM EDT | Heat Advisory | RNK | 29 hr |
| Jul 22, 5:59 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 5:52 PM EDT | Severe Thunderstorm Warning | RNK | 53 min |
| Jul 30, 2:44 PM EDT | Severe Thunderstorm Warning | RNK | 46 min |
| Jul 30, 2:49 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Aug 5, 12:39 AM EDT | Special Weather Statement | RNK | 51 min |
| Aug 13, 4:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 14, 1:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Aug 14, 2:07 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 14, 3:47 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Aug 29, 5:22 PM EDT | Special Weather Statement | RNK | 53 min |
| Sep 2, 2:31 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Sep 2, 5:59 PM EDT | Severe Thunderstorm Warning | RNK | 61 min |
| Sep 2, 6:28 PM EDT | Special Weather Statement | RNK | 62 min |
| Sep 2, 7:02 PM EDT | Severe Thunderstorm Warning | RNK | 44 min |
| Sep 3, 1:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Sep 3, 1:41 PM EDT | Special Weather Statement | RNK | 64 min |
| Sep 3, 2:50 PM EDT | Severe Thunderstorm Warning | RNK | 55 min |
| Sep 3, 3:23 PM EDT | Severe Thunderstorm Warning | RNK | 67 min |
| Sep 3, 3:37 PM EDT | Severe Thunderstorm Warning | RNK | 24 min |
| Sep 3, 3:55 PM EDT | Severe Thunderstorm Warning | RNK | 65 min |
| Sep 4, 3:07 AM EDT | Dense Fog Advisory | RNK | 6 hr |
| Sep 4, 3:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Sep 4, 3:25 PM EDT | Flash Flood Watch | RNK | 60 hr |
| Sep 5, 6:29 PM EDT | Tornado Watch | SPC | 10 hr |
| Sep 5, 7:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Sep 6, 3:30 AM EDT | Areal Flood Warning | RNK | 18 hr |
| Oct 21, 2:21 PM EDT | Freeze Warning | RNK | 20 hr |
| Oct 22, 3:07 PM EDT | Frost Advisory | RNK | 18 hr |
| Oct 28, 4:12 AM EDT | Winter Storm Watch | RNK | 12 hr |
| Oct 28, 4:02 PM EDT | Winter Weather Advisory | RNK | 17 hr |
| Oct 29, 12:34 AM EDT | Mesoscale Discussion | SPC | 6 hr |
| Nov 22, 10:48 PM EST | Special Weather Statement | RNK | 42 min |
| Nov 23, 3:17 AM EST | High Wind Warning | RNK | 12 hr |
| Nov 23, 3:17 AM EST | Wind Advisory | RNK | 19 hr |
| Nov 27, 3:00 PM EST | Wind Advisory | RNK | 39 hr |
| Nov 28, 9:42 PM EST | Special Weather Statement | RNK | 63 min |
| Nov 29, 3:11 AM EST | Special Weather Statement | RNK | 64 min |
| Nov 29, 3:27 AM EST | Areal Flood Warning | RNK | 4 hr |
| Nov 29, 7:26 AM EST | Areal Flood Warning | RNK | 4 hr |
| Dec 7, 4:06 AM EST | Flood Watch | RNK | 15 hr |
| Dec 7, 4:47 AM EST | Special Weather Statement | RNK | 88 min |
| Dec 7, 6:32 AM EST | Special Weather Statement | RNK | 73 min |
| Dec 7, 2:25 PM EST | Wind Advisory | RNK | 11 hr |
| Dec 7, 5:03 PM EST | Areal Flood Advisory | RNK | 4 hr |
| Dec 7, 9:01 PM EST | Areal Flood Advisory | RNK | 14 hr |
| Dec 27, 3:38 AM EST | Wind Advisory | RNK | 32 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 archive20102012
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.