Alert archive / Virginia / Montgomery County
Weather alerts in Montgomery County, Virginia, 2015
143 weather alerts in 2015, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Montgomery County and its neighbors
Each county as a circle sized by its count in 2015. Tap one for its archive.
- Alerts
- 143
- Warnings
- 22
- Watches
- 26
- Advisories
- 30
- Busiest month
- June34 alerts
- Busiest day
- July 13, 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.
Montgomery 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% | 3 | 100% | 27 min |
| Flash flood warnings | 1 | 1 | 0% | 2 | 100% | 29 min |
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 11, 2:29 PM EST | Freezing Rain Advisory | RNK | 21 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 29, 4:05 PM EST | Wind Advisory | RNK | 32 hr |
| Feb 1, 3:28 PM EST | Wind Advisory | RNK | 31 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, 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, 5:01 AM EST | Winter Storm Watch | RNK | 11 hr |
| Feb 15, 3:46 PM EST | Winter Storm Warning | RNK | 37 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 Weather Advisory | RNK | 39 hr |
| Mar 5, 11:55 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Mar 5, 4:14 PM EST | Areal Flood Warning | RNK | 12 hr |
| Mar 14, 3:20 PM EDT | Wind Advisory | RNK | 25 hr |
| Mar 26, 7:37 PM EDT | Special Weather Statement | RNK | 53 min |
| Mar 26, 8:15 PM EDT | Special Weather Statement | RNK | 45 min |
| Mar 26, 9:01 PM EDT | Special Weather Statement | RNK | 44 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, 8:43 PM EDT | Wind Advisory | RNK | 17 hr |
| Apr 9, 1:03 AM EDT | Special Weather Statement | RNK | 42 min |
| Apr 9, 1:50 AM EDT | Special Weather Statement | RNK | 55 min |
| Apr 10, 10:16 AM EDT | Special Weather Statement | RNK | 59 min |
| Apr 10, 11:04 AM EDT | Special Weather Statement | RNK | 56 min |
| Apr 10, 4:37 PM EDT | Special Weather Statement | RNK | 53 min |
| Apr 18, 3:42 PM EDT | Flood Watch | RNK | 33 hr |
| Apr 20, 10:13 AM EDT | River Flood Warning | RNK | 22 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, 4:16 PM EDT | Special Weather Statement | RNK | 29 min |
| Apr 20, 4:51 PM EDT | Areal Flood Advisory | RNK | 114 min |
| Apr 20, 6:27 PM EDT | Mesoscale Discussion | SPC | 93 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 6, 1:30 PM EDT | Special Weather Statement | RNK | 30 min |
| May 6, 3:35 PM EDT | Special Weather Statement | RNK | 25 min |
| May 11, 3:24 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 17, 4:51 PM EDT | Special Weather Statement | RNK | 39 min |
| Jun 2, 4:31 PM EDT | Special Weather Statement | RNK | 44 min |
| Jun 2, 5:17 PM EDT | Special Weather Statement | RNK | 28 min |
| Jun 8, 4:21 PM EDT | Special Weather Statement | RNK | 39 min |
| Jun 8, 4:35 PM EDT | Severe Thunderstorm Warning | RNK | 43 min |
| Jun 8, 4:54 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Jun 8, 5:07 PM EDT | Special Weather Statement | RNK | 38 min |
| Jun 8, 6:24 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 8, 7:50 PM EDT | Special Weather Statement | RNK | 40 min |
| Jun 11, 4:41 PM EDT | Special Weather Statement | RNK | 34 min |
| Jun 14, 1:26 PM EDT | Special Weather Statement | RNK | 34 min |
| Jun 14, 5:18 PM EDT | Special Weather Statement | RNK | 57 min |
| Jun 17, 12:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 17, 4:14 PM EDT | Special Weather Statement | RNK | 61 min |
| Jun 17, 9:30 PM EDT | Special Weather Statement | RNK | 60 min |
| Jun 17, 9:55 PM EDT | Severe Thunderstorm Warning | RNK | 35 min |
| 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, 2:04 PM EDT | Special Weather Statement | RNK | 56 min |
| Jun 20, 3:26 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 21, 3:23 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 21, 5:14 PM EDT | Severe Thunderstorm Warning | RNK | 61 min |
| Jun 21, 5:21 PM EDT | Severe Thunderstorm Warning | RNK | 54 min |
| 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, 7:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jun 25, 4:50 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 26, 6:33 AM EDT | Special Weather Statement | RNK | 42 min |
| Jun 26, 11:51 PM EDT | Flash Flood Watch | RNK | 18 hr |
| Jun 27, 2:18 AM EDT | Special Weather Statement | RNK | 27 min |
| Jun 27, 2:06 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| 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, 10:22 PM EDT | Severe Thunderstorm Warning | RNK | 53 min |
| Jul 5, 4:35 AM EDT | Flash Flood Watch | RNK | 25 hr |
| Jul 5, 11:27 PM EDT | Special Weather Statement | RNK | 63 min |
| Jul 6, 12:21 AM EDT | Special Weather Statement | RNK | 54 min |
| Jul 13, 12:14 AM EDT | Special Weather Statement | RNK | 61 min |
| Jul 13, 1:46 AM EDT | Special Weather Statement | RNK | 44 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, 4:39 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 13, 5:45 PM EDT | Mesoscale Discussion | SPC | 2 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, 6:44 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 14, 9:26 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Aug 5, 10:07 PM EDT | Special Weather Statement | RNK | 38 min |
| Aug 10, 2:35 PM EDT | Special Weather Statement | RNK | 70 min |
| Aug 10, 9:32 PM EDT | Special Weather Statement | RNK | 73 min |
| Aug 11, 1:28 PM EDT | Special Weather Statement | RNK | 32 min |
| Aug 15, 5:50 PM EDT | Special Weather Statement | RNK | 25 min |
| Aug 15, 6:29 PM EDT | Special Weather Statement | RNK | 31 min |
| Aug 15, 6:59 PM EDT | Special Weather Statement | RNK | 31 min |
| Aug 16, 6:39 PM EDT | Special Weather Statement | RNK | 36 min |
| Aug 16, 7:17 PM EDT | Special Weather Statement | RNK | 58 min |
| Aug 19, 5:12 PM EDT | Special Weather Statement | RNK | 33 min |
| Sep 3, 3:39 PM EDT | Special Weather Statement | RNK | 66 min |
| Sep 4, 5:04 PM EDT | Severe Thunderstorm Warning | RNK | 56 min |
| Sep 4, 5:57 PM EDT | Severe Thunderstorm Warning | RNK | 63 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, 7:32 AM EDT | Areal Flood Warning | RNK | 21 hr |
| Sep 29, 9:43 AM EDT | Flash Flood Warning | RNK | 6 hr |
| Sep 29, 2:33 PM EDT | Areal Flood Warning | RNK | 19 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, 7:17 PM EDT | Special Weather Statement | RNK | 43 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 |
| Nov 12, 3:42 AM EST | Wind Advisory | RNK | 50 hr |
| Nov 19, 1:02 AM EST | Special Weather Statement | RNK | 58 min |
| Nov 19, 3:51 AM EST | Areal Flood Advisory | RNK | 3 hr |
| Nov 19, 5:29 AM EST | Areal Flood Warning | RNK | 3 hr |
| Nov 19, 7:22 AM EST | Areal Flood Advisory | RNK | 113 min |
| Nov 30, 3:53 PM EST | Flood Watch | RNK | 46 hr |
| Dec 14, 3:26 PM EST | Special Weather Statement | RNK | 34 min |
| Dec 22, 3:28 PM EST | Flash Flood Watch | RNK | 28 hr |
| Dec 22, 7:12 PM EST | Dense Fog Advisory | RNK | 18 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.