Alert archive / Virginia / Montgomery County
Weather alerts in Montgomery County, Virginia, 2013
146 weather alerts in 2013, 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 2013. Tap one for its archive.
- Alerts
- 146
- Warnings
- 33
- Watches
- 23
- Advisories
- 39
- Busiest month
- January29 alerts
- Busiest day
- January 30, 201312 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, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 13 | 10 | 23% | 9 | 89% | 13 min |
| Flash flood warnings | 3 | 2 | 33% | 1 | 100% | 240 min |
Each office's whole area, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Blacksburg, VA: tornado warnings | 3 | 0 | 100% | 1 | 0% | |
| NWS Blacksburg, VA: severe thunderstorm warnings | 198 | 126 | 36% | 389 | 78% | 24 min |
| NWS Blacksburg, VA: flash flood warnings | 69 | 38 | 45% | 121 | 73% | 101 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 11, 2:37 PM EST | Dense Fog Advisory | RNK | 19 hr |
| Jan 12, 8:01 PM EST | Dense Fog Advisory | RNK | 14 hr |
| Jan 15, 4:31 AM EST | Flood Watch | RNK | 30 hr |
| Jan 16, 4:29 AM EST | Winter Storm Watch | RNK | 11 hr |
| Jan 16, 3:56 PM EST | Winter Storm Warning | RNK | 33 hr |
| Jan 16, 4:02 PM EST | Flood Watch | RNK | 20 hr |
| Jan 17, 12:38 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 21, 4:22 AM EST | Wind Chill Advisory | RNK | 55 hr |
| Jan 24, 3:52 PM EST | Winter Weather Advisory | RNK | 41 hr |
| Jan 27, 5:00 AM EST | Freezing Rain Advisory | RNK | 29 hr |
| Jan 29, 4:07 PM EST | Wind Advisory | RNK | 69 hr |
| Jan 30, 4:24 AM EST | Flash Flood Watch | RNK | 21 hr |
| Jan 30, 10:19 AM EST | Mesoscale Discussion | SPC | 86 min |
| Jan 30, 12:54 PM EST | Mesoscale Discussion | SPC | 96 min |
| Jan 30, 3:21 PM EST | Mesoscale Discussion | SPC | 84 min |
| Jan 30, 3:22 PM EST | Special Weather Statement | RNK | 53 min |
| Jan 30, 3:27 PM EST | Severe Thunderstorm Warning | RNK | 63 min |
| Jan 30, 3:42 PM EST | Severe Thunderstorm Watch | SPC | 5 hr |
| Jan 30, 4:02 PM EST | Severe Thunderstorm Warning | RNK | 58 min |
| Jan 30, 4:57 PM EST | Areal Flood Advisory | RNK | 6 hr |
| Jan 30, 5:02 PM EST | Areal Flood Advisory | RNK | 6 hr |
| Jan 30, 5:34 PM EST | Areal Flood Warning | RNK | 18 hr |
| Jan 30, 6:25 PM EST | Flash Flood Warning | RNK | 6 hr |
| Jan 30, 7:09 PM EST | Mesoscale Discussion | SPC | 66 min |
| Jan 30, 9:02 PM EST | Flash Flood Warning | RNK | 6 hr |
| Jan 30, 9:33 PM EST | River Flood Warning | RNK | 29 hr |
| Jan 31, 12:11 AM EST | Areal Flood Warning | RNK | 9 hr |
| Jan 31, 12:34 AM EST | Areal Flood Warning | RNK | 9 hr |
| Jan 31, 2:42 AM EST | Areal Flood Warning | RNK | 6 hr |
| Feb 1, 3:41 PM EST | Winter Weather Advisory | RNK | 48 hr |
| Feb 7, 3:37 PM EST | Winter Weather Advisory | RNK | 16 hr |
| Feb 8, 4:25 AM EST | Wind Advisory | RNK | 26 hr |
| Feb 11, 3:08 PM EST | Wind Advisory | RNK | 16 hr |
| Feb 18, 5:19 AM EST | Winter Weather Advisory | RNK | 29 hr |
| Feb 19, 3:41 PM EST | Wind Advisory | RNK | 20 hr |
| Feb 21, 4:59 AM EST | Winter Weather Advisory | RNK | 53 hr |
| Feb 25, 4:08 AM EST | Winter Weather Advisory | RNK | 38 hr |
| Feb 26, 6:54 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Mar 4, 5:24 AM EST | Winter Storm Watch | RNK | 23 hr |
| Mar 5, 4:48 AM EST | Winter Weather Advisory | RNK | 53 hr |
| Mar 12, 10:00 AM EDT | Special Weather Statement | RNK | 15 min |
| Mar 16, 3:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Mar 23, 4:15 PM EDT | Winter Storm Warning | RNK | 70 hr |
| Mar 23, 8:54 PM EDT | Winter Weather Advisory | RNK | 65 hr |
| Mar 24, 11:53 AM EDT | Mesoscale Discussion | SPC | 6 hr |
| Apr 4, 4:36 AM EDT | Winter Weather Advisory | RNK | 21 hr |
| Apr 4, 5:04 PM EDT | Winter Storm Warning | RNK | 5 hr |
| Apr 24, 4:56 PM EDT | Severe Thunderstorm Warning | RNK | 49 min |
| Apr 24, 5:41 PM EDT | Special Weather Statement | RNK | 34 min |
| May 4, 4:05 AM EDT | Flood Watch | RNK | 4 days |
| May 6, 8:50 PM EDT | Areal Flood Warning | RNK | 3 hr |
| May 7, 12:05 AM EDT | Areal Flood Warning | RNK | 8 hr |
| May 7, 6:08 PM EDT | Special Weather Statement | RNK | 67 min |
| May 8, 10:19 AM EDT | Flood Watch | RNK | 5 hr |
| May 10, 5:49 PM EDT | Severe Thunderstorm Warning | RNK | 41 min |
| May 12, 4:01 PM EDT | Frost Advisory | RNK | 17 hr |
| May 16, 7:02 PM EDT | Special Weather Statement | RNK | 58 min |
| May 17, 2:53 PM EDT | Special Weather Statement | RNK | 22 min |
| May 20, 7:41 PM EDT | Special Weather Statement | RNK | 34 min |
| May 21, 4:58 AM EDT | Dense Fog Advisory | RNK | 4 hr |
| May 22, 3:10 PM EDT | Severe Thunderstorm Warning | RNK | 50 min |
| May 22, 3:32 PM EDT | Areal Flood Advisory | RNK | 118 min |
| May 22, 3:37 PM EDT | Severe Thunderstorm Warning | RNK | 23 min |
| May 22, 3:57 PM EDT | Severe Thunderstorm Warning | RNK | 33 min |
| May 22, 5:42 PM EDT | Special Weather Statement | RNK | 33 min |
| May 22, 6:07 PM EDT | Special Weather Statement | RNK | 23 min |
| May 23, 6:30 PM EDT | Special Weather Statement | RNK | 30 min |
| May 23, 6:58 PM EDT | Special Weather Statement | RNK | 32 min |
| May 24, 4:19 AM EDT | Wind Advisory | RNK | 11 hr |
| Jun 6, 4:22 AM EDT | Special Weather Statement | RNK | 53 min |
| Jun 6, 1:13 PM EDT | Flood Watch | RNK | 30 hr |
| Jun 6, 4:42 PM EDT | Areal Flood Warning | RNK | 3 hr |
| Jun 9, 8:11 PM EDT | Special Weather Statement | RNK | 64 min |
| Jun 9, 8:13 PM EDT | Special Weather Statement | RNK | 62 min |
| Jun 9, 9:00 PM EDT | Flash Flood Watch | RNK | 22 hr |
| Jun 10, 12:56 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 1:50 PM EDT | Severe Thunderstorm Warning | RNK | 40 min |
| Jun 10, 2:02 PM EDT | Tornado Watch | SPC | 10 hr |
| Jun 10, 2:05 PM EDT | Special Weather Statement | RNK | 25 min |
| Jun 10, 2:27 PM EDT | Special Weather Statement | RNK | 33 min |
| Jun 13, 11:38 AM EDT | Mesoscale Discussion | SPC | 67 min |
| Jun 13, 12:19 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 13, 1:55 PM EDT | Severe Thunderstorm Warning | RNK | 65 min |
| Jun 13, 2:20 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jun 16, 8:23 PM EDT | Special Weather Statement | RNK | 22 min |
| Jun 16, 11:16 PM EDT | Special Weather Statement | RNK | 44 min |
| Jun 19, 5:20 PM EDT | Special Weather Statement | RNK | 55 min |
| Jun 19, 5:23 PM EDT | Severe Thunderstorm Warning | RNK | 52 min |
| Jun 23, 7:15 PM EDT | Special Weather Statement | RNK | 60 min |
| Jun 26, 1:19 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 2:09 PM EDT | Severe Thunderstorm Warning | RNK | 66 min |
| Jun 26, 2:37 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Jul 2, 4:19 AM EDT | Flash Flood Watch | RNK | 5 days |
| Jul 2, 12:31 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Jul 3, 5:16 PM EDT | Areal Flood Advisory | RNK | 9 hr |
| Jul 3, 9:35 PM EDT | Areal Flood Warning | RNK | 6 hr |
| Jul 4, 2:13 AM EDT | Areal Flood Advisory | RNK | 4 hr |
| Jul 4, 3:26 AM EDT | Areal Flood Warning | RNK | 16 hr |
| Jul 4, 9:55 AM EDT | River Flood Warning | RNK | 10 hr |
| Jul 4, 11:32 AM EDT | Special Weather Statement | RNK | 58 min |
| Jul 6, 4:00 PM EDT | Flash Flood Watch | RNK | 29 hr |
| Jul 7, 3:10 PM EDT | Special Weather Statement | RNK | 65 min |
| Jul 7, 4:24 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Jul 7, 7:14 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Jul 10, 2:59 PM EDT | Flash Flood Watch | RNK | 11 hr |
| Jul 10, 3:34 PM EDT | Special Weather Statement | RNK | 26 min |
| Jul 10, 4:40 PM EDT | Special Weather Statement | RNK | 35 min |
| Jul 10, 5:14 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Jul 10, 6:54 PM EDT | Flash Flood Warning | RNK | 3 hr |
| Jul 11, 4:48 AM EDT | Flash Flood Watch | RNK | 44 hr |
| Jul 13, 3:48 AM EDT | Flash Flood Watch | RNK | 21 hr |
| Jul 19, 2:25 PM EDT | Special Weather Statement | RNK | 35 min |
| Jul 19, 6:29 PM EDT | Severe Thunderstorm Warning | RNK | 46 min |
| Jul 21, 3:28 PM EDT | Severe Thunderstorm Warning | RNK | 47 min |
| Jul 22, 10:46 AM EDT | Flash Flood Watch | RNK | 13 hr |
| Jul 27, 9:49 AM EDT | Flash Flood Watch | RNK | 20 hr |
| Aug 12, 4:17 PM EDT | Flash Flood Watch | RNK | 27 hr |
| Aug 20, 2:18 AM EDT | Dense Fog Advisory | RNK | 8 hr |
| Aug 21, 1:26 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 21, 8:55 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Aug 21, 9:29 PM EDT | Special Weather Statement | RNK | 46 min |
| Aug 28, 6:53 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 31, 3:42 PM EDT | Special Weather Statement | RNK | 33 min |
| Sep 12, 7:36 PM EDT | Special Weather Statement | RNK | 54 min |
| Sep 21, 3:52 PM EDT | Special Weather Statement | RNK | 53 min |
| Oct 7, 4:16 AM EDT | Special Weather Statement | RNK | 59 min |
| Oct 7, 5:26 AM EDT | Special Weather Statement | RNK | 64 min |
| Oct 20, 12:04 PM EDT | Frost Advisory | RNK | 21 hr |
| Oct 23, 4:03 AM EDT | Freeze Warning | RNK | 29 hr |
| Oct 23, 2:42 PM EDT | Frost Advisory | RNK | 18 hr |
| Oct 24, 9:40 AM EDT | Freeze Watch | RNK | 23 hr |
| Oct 25, 3:52 AM EDT | Freeze Warning | RNK | 29 hr |
| Oct 31, 4:43 AM EDT | Wind Advisory | RNK | 26 hr |
| Nov 1, 3:37 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Nov 1, 7:15 AM EDT | Special Weather Statement | RNK | 60 min |
| Nov 18, 12:39 AM EST | Special Weather Statement | RNK | 36 min |
| Nov 25, 5:03 AM EST | Winter Weather Advisory | RNK | 34 hr |
| Nov 26, 3:39 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Nov 26, 4:28 AM EST | Wind Advisory | RNK | 42 hr |
| Nov 26, 11:05 AM EST | Flood Watch | RNK | 18 hr |
| Nov 26, 3:00 PM EST | Winter Weather Advisory | RNK | 32 hr |
| Dec 6, 5:09 AM EST | Winter Storm Watch | RNK | 25 hr |
| Dec 6, 9:12 AM EST | Special Weather Statement | RNK | 33 min |
| Dec 7, 5:45 AM EST | Winter Storm Warning | RNK | 51 hr |
| Dec 9, 2:39 PM EST | Winter Weather Advisory | RNK | 21 hr |
| Dec 23, 3:56 AM EST | Special Weather Statement | RNK | 49 min |
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 | 13 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 16 |
| Special Weather Statement | 35 |
| Flooding | |
| Areal Flood Warning | 9 |
| Flash Flood Warning | 3 |
| River Flood Warning | 2 |
| Flash Flood Watch | 10 |
| Flood Watch | 6 |
| Areal Flood Advisory | 11 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 3 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 12 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20122014
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.