Alert archive / Virginia / Montgomery County
Weather alerts in Montgomery County, Virginia, 2018
152 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 152
- Warnings
- 30
- Watches
- 24
- Advisories
- 43
- Busiest month
- August21 alerts
- Busiest day
- March 21, 20187 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, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 10 | 7 | 30% | 13 | 77% | 13 min |
| Flash flood warnings | 5 | 5 | 0% | 6 | 100% | 150 min |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Blacksburg, VA: tornado warnings | 13 | 4 | 69% | 18 | 33% | 8 min |
| NWS Blacksburg, VA: severe thunderstorm warnings | 211 | 147 | 30% | 440 | 70% | 23 min |
| NWS Blacksburg, VA: flash flood warnings | 132 | 82 | 38% | 290 | 84% | 132 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 1, 3:04 AM EST | Wind Chill Advisory | RNK | 31 hr |
| Jan 3, 4:04 AM EST | Wind Chill Watch | RNK | 47 hr |
| Jan 3, 4:04 AM EST | Wind Chill Advisory | RNK | 3 days |
| Jan 7, 2:51 PM EST | Winter Weather Advisory | RNK | 33 hr |
| Jan 12, 3:57 PM EST | Winter Weather Advisory | RNK | 18 hr |
| Jan 12, 7:04 PM EST | Special Weather Statement | RNK | 41 min |
| Jan 12, 7:46 PM EST | Special Weather Statement | RNK | 59 min |
| Jan 17, 4:23 AM EST | Wind Chill Advisory | RNK | 30 hr |
| Jan 29, 2:55 PM EST | Wind Advisory | RNK | 21 hr |
| Feb 3, 3:46 AM EST | Winter Weather Advisory | RNK | 39 hr |
| Feb 4, 5:59 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 9, 1:00 PM EST | Flood Watch | RNK | 49 hr |
| Feb 16, 3:31 PM EST | Winter Weather Advisory | RNK | 31 hr |
| Feb 19, 11:24 PM EST | Dense Fog Advisory | RNK | 13 hr |
| Feb 28, 10:55 AM EST | High Wind Watch | RNK | 17 hr |
| Mar 1, 3:52 AM EST | High Wind Warning | RNK | 48 hr |
| Mar 2, 9:45 PM EST | Wind Advisory | RNK | 13 hr |
| Mar 10, 4:39 AM EST | Winter Storm Watch | RNK | 23 hr |
| Mar 11, 4:47 AM EDT | Winter Storm Warning | RNK | 39 hr |
| Mar 14, 2:58 PM EDT | Wind Advisory | RNK | 29 hr |
| Mar 19, 3:40 PM EDT | Winter Storm Watch | RNK | 13 hr |
| Mar 20, 5:06 AM EDT | Winter Storm Warning | RNK | 42 hr |
| Mar 20, 10:02 AM EDT | Special Weather Statement | RNK | 13 min |
| Mar 20, 8:43 PM EDT | Special Weather Statement | RNK | 62 min |
| Mar 20, 9:34 PM EDT | Special Weather Statement | RNK | 56 min |
| Mar 20, 9:55 PM EDT | Mesoscale Discussion | SPC | 6 hr |
| Mar 21, 7:34 AM EDT | Special Weather Statement | RNK | 56 min |
| Mar 21, 3:02 PM EDT | Wind Advisory | RNK | 21 hr |
| Mar 21, 6:21 PM EDT | Special Weather Statement | RNK | 54 min |
| Mar 21, 7:13 PM EDT | Special Weather Statement | RNK | 62 min |
| Mar 22, 4:44 AM EDT | Winter Storm Watch | RNK | 35 hr |
| Mar 23, 3:46 PM EDT | Winter Storm Warning | RNK | 37 hr |
| Apr 3, 4:21 AM EDT | Wind Advisory | RNK | 45 hr |
| Apr 4, 4:05 AM EDT | Special Weather Statement | RNK | 40 min |
| Apr 4, 4:50 AM EDT | Special Weather Statement | RNK | 55 min |
| Apr 9, 10:49 PM EDT | Dense Fog Advisory | RNK | 5 hr |
| Apr 15, 3:57 AM EDT | Flash Flood Watch | RNK | 20 hr |
| Apr 15, 2:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Apr 15, 3:02 PM EDT | Tornado Watch | SPC | 8 hr |
| Apr 15, 3:43 PM EDT | Special Weather Statement | RNK | 62 min |
| Apr 15, 3:57 PM EDT | Severe Thunderstorm Warning | RNK | 63 min |
| Apr 15, 4:37 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Apr 18, 2:59 PM EDT | Wind Advisory | RNK | 26 hr |
| May 5, 4:41 PM EDT | Special Weather Statement | RNK | 34 min |
| May 10, 12:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| May 15, 2:09 PM EDT | Severe Thunderstorm Warning | RNK | 51 min |
| May 15, 3:38 PM EDT | Severe Thunderstorm Warning | RNK | 67 min |
| May 16, 3:51 PM EDT | Special Weather Statement | RNK | 69 min |
| May 17, 4:13 AM EDT | Flash Flood Watch | RNK | 68 hr |
| May 18, 5:22 PM EDT | Areal Flood Warning | RNK | 5 hr |
| May 22, 5:30 PM EDT | Special Weather Statement | RNK | 45 min |
| May 22, 5:37 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| May 26, 12:37 PM EDT | Areal Flood Advisory | RNK | 4 hr |
| May 27, 3:34 PM EDT | Special Weather Statement | RNK | 26 min |
| May 27, 8:52 PM EDT | Special Weather Statement | RNK | 53 min |
| May 28, 3:13 PM EDT | Flash Flood Watch | RNK | 3 days |
| Jun 2, 11:32 AM EDT | Flash Flood Watch | RNK | 9 hr |
| Jun 10, 3:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 22, 3:19 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jun 24, 3:57 PM EDT | Special Weather Statement | RNK | 33 min |
| Jul 2, 4:49 PM EDT | Special Weather Statement | RNK | 56 min |
| Jul 2, 5:54 PM EDT | Special Weather Statement | RNK | 66 min |
| Jul 6, 1:13 AM EDT | Special Weather Statement | RNK | 62 min |
| Jul 6, 7:47 PM EDT | Special Weather Statement | RNK | 58 min |
| Jul 15, 5:28 PM EDT | Special Weather Statement | RNK | 32 min |
| Jul 15, 5:48 PM EDT | Severe Thunderstorm Warning | RNK | 37 min |
| Jul 22, 12:52 PM EDT | Special Weather Statement | RNK | 53 min |
| Jul 23, 2:45 PM EDT | Flash Flood Watch | RNK | 14 hr |
| Jul 25, 1:49 PM EDT | Special Weather Statement | RNK | 26 min |
| Jul 25, 3:54 PM EDT | Special Weather Statement | RNK | 66 min |
| Jul 26, 1:19 AM EDT | Dense Fog Advisory | RNK | 8 hr |
| Jul 30, 3:45 PM EDT | Severe Thunderstorm Warning | RNK | 45 min |
| Jul 30, 4:33 PM EDT | Special Weather Statement | RNK | 57 min |
| Jul 30, 5:35 PM EDT | Special Weather Statement | RNK | 25 min |
| Jul 30, 6:49 PM EDT | Areal Flood Advisory | RNK | 6 hr |
| Aug 1, 3:44 AM EDT | Flash Flood Watch | RNK | 64 hr |
| Aug 2, 3:16 PM EDT | Special Weather Statement | RNK | 44 min |
| Aug 3, 2:42 PM EDT | Areal Flood Warning | RNK | 3 hr |
| Aug 4, 3:43 AM EDT | Dense Fog Advisory | RNK | 5 hr |
| Aug 7, 3:30 PM EDT | Special Weather Statement | RNK | 45 min |
| Aug 7, 3:56 PM EDT | Special Weather Statement | RNK | 49 min |
| Aug 7, 4:12 PM EDT | Severe Thunderstorm Warning | RNK | 63 min |
| Aug 8, 1:35 PM EDT | Special Weather Statement | RNK | 40 min |
| Aug 8, 2:54 PM EDT | Special Weather Statement | RNK | 66 min |
| Aug 8, 3:05 PM EDT | Severe Thunderstorm Warning | RNK | 40 min |
| Aug 12, 1:04 PM EDT | Severe Thunderstorm Warning | RNK | 41 min |
| Aug 12, 1:28 PM EDT | Severe Thunderstorm Warning | RNK | 51 min |
| Aug 12, 4:59 PM EDT | Special Weather Statement | RNK | 31 min |
| Aug 20, 12:32 AM EDT | Special Weather Statement | RNK | 58 min |
| Aug 20, 2:34 PM EDT | Flash Flood Watch | RNK | 12 hr |
| Aug 21, 6:54 PM EDT | Special Weather Statement | RNK | 66 min |
| Aug 30, 1:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Aug 30, 4:01 PM EDT | Special Weather Statement | RNK | 44 min |
| Aug 30, 5:06 PM EDT | Severe Thunderstorm Warning | RNK | 54 min |
| Aug 30, 5:34 PM EDT | Flash Flood Warning | RNK | 3 hr |
| Aug 30, 6:27 PM EDT | Areal Flood Advisory | RNK | 118 min |
| Sep 1, 12:24 PM EDT | Flash Flood Watch | RNK | 8 hr |
| Sep 2, 2:51 PM EDT | Special Weather Statement | RNK | 39 min |
| Sep 7, 6:04 PM EDT | Special Weather Statement | RNK | 26 min |
| Sep 10, 3:09 AM EDT | Special Weather Statement | RNK | 51 min |
| Sep 11, 3:16 PM EDT | Areal Flood Advisory | RNK | 2 hr |
| Sep 14, 4:28 AM EDT | Flash Flood Watch | RNK | 4 days |
| Sep 16, 3:26 PM EDT | River Flood Warning | RNK | 37 hr |
| Sep 16, 9:28 PM EDT | Flash Flood Warning | RNK | 12 hr |
| Sep 17, 5:21 AM EDT | Areal Flood Warning | RNK | 12 hr |
| Sep 17, 8:24 PM EDT | Special Weather Statement | RNK | 66 min |
| Sep 22, 1:36 PM EDT | Flash Flood Watch | RNK | 14 hr |
| Sep 22, 4:22 PM EDT | Areal Flood Advisory | RNK | 4 hr |
| Sep 22, 11:00 PM EDT | Flash Flood Warning | RNK | 4 hr |
| Sep 23, 12:25 AM EDT | Areal Flood Advisory | RNK | 6 hr |
| Sep 23, 2:54 AM EDT | Areal Flood Warning | RNK | 6 hr |
| Sep 26, 3:40 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 27, 3:11 AM EDT | Flash Flood Watch | RNK | 21 hr |
| Sep 27, 10:25 PM EDT | Areal Flood Advisory | RNK | 4 hr |
| Oct 6, 2:56 AM EDT | Dense Fog Advisory | RNK | 7 hr |
| Oct 7, 2:32 AM EDT | Dense Fog Advisory | RNK | 7 hr |
| Oct 9, 3:56 PM EDT | Flash Flood Watch | RNK | 51 hr |
| Oct 10, 7:35 PM EDT | Areal Flood Warning | RNK | 9 hr |
| Oct 10, 9:31 PM EDT | River Flood Warning | RNK | 42 hr |
| Oct 11, 4:43 AM EDT | Wind Advisory | RNK | 30 hr |
| Oct 11, 10:01 AM EDT | Flash Flood Warning | RNK | 6 hr |
| Oct 11, 3:57 PM EDT | Flash Flood Warning | RNK | 3 hr |
| Oct 11, 6:52 PM EDT | Areal Flood Warning | RNK | 6 hr |
| Oct 18, 3:50 PM EDT | Frost Advisory | RNK | 17 hr |
| Oct 20, 3:31 AM EDT | Wind Advisory | RNK | 32 hr |
| Oct 21, 4:02 AM EDT | Freeze Warning | RNK | 30 hr |
| Oct 28, 10:39 AM EDT | Wind Advisory | RNK | 25 hr |
| Nov 2, 4:20 PM EDT | Special Weather Statement | RNK | 55 min |
| Nov 6, 8:14 AM EST | Special Weather Statement | RNK | 31 min |
| Nov 9, 1:27 PM EST | Wind Advisory | RNK | 24 hr |
| Nov 13, 3:35 PM EST | Winter Storm Watch | RNK | 24 hr |
| Nov 14, 5:15 AM EST | Winter Storm Warning | RNK | 38 hr |
| Nov 15, 3:18 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Nov 15, 7:14 PM EST | Wind Advisory | RNK | 17 hr |
| Nov 23, 4:04 AM EST | Winter Weather Advisory | RNK | 31 hr |
| Nov 23, 9:15 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Nov 25, 2:46 PM EST | Wind Advisory | RNK | 37 hr |
| Nov 27, 2:39 PM EST | Wind Advisory | RNK | 21 hr |
| Dec 1, 5:11 PM EST | Dense Fog Advisory | RNK | 16 hr |
| Dec 4, 2:35 PM EST | Winter Weather Advisory | RNK | 28 hr |
| Dec 6, 3:31 PM EST | Winter Storm Watch | RNK | 47 hr |
| Dec 7, 3:27 AM EST | Winter Storm Warning | RNK | 3 days |
| Dec 9, 3:08 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 9, 8:18 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 9, 12:34 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 13, 2:54 PM EST | Flood Watch | RNK | 48 hr |
| Dec 20, 3:27 AM EST | Flood Watch | RNK | 37 hr |
| Dec 20, 9:14 PM EST | Areal Flood Advisory | RNK | 3 hr |
| Dec 21, 4:03 AM EST | Wind Advisory | RNK | 26 hr |
| Dec 26, 3:00 PM EST | Flood Watch | RNK | 52 hr |
| Dec 28, 11:08 AM EST | Areal Flood Advisory | RNK | 5 hr |
| Dec 28, 4:48 PM EST | Areal Flood Advisory | RNK | 3 hr |
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 | 10 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 13 |
| Special Weather Statement | 42 |
| Flooding | |
| Areal Flood Warning | 6 |
| Flash Flood Warning | 5 |
| River Flood Warning | 2 |
| Flash Flood Watch | 12 |
| Flood Watch | 4 |
| Areal Flood Advisory | 12 |
| Winter | |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 6 |
| Cold | |
| Freeze Warning | 1 |
| Wind Chill Watch | 1 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 14 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.