Alert archive / Virginia / Amherst County
Weather alerts in Amherst County, Virginia, 2020
205 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Amherst County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 205
- Warnings
- 36
- Watches
- 51
- Advisories
- 67
- Busiest month
- August42 alerts
- Busiest day
- April 9, 20207 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Amherst County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 16 | 13 | 19% | 5 | 80% | 24 min |
| Flash flood warnings | 2 | 1 | 50% | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Blacksburg, VA: tornado warnings | 11 | 0 | 100% | 1 | 0% | |
| NWS Blacksburg, VA: severe thunderstorm warnings | 175 | 134 | 23% | 447 | 74% | 20 min |
| NWS Blacksburg, VA: flash flood warnings | 81 | 53 | 35% | 206 | 68% | 95 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, 2:08 PM EST | Special Weather Statement | RNK | 22 min |
| Jan 4, 5:12 PM EST | Wind Advisory | LWX | 16 hr |
| Jan 6, 3:35 AM EST | Winter Weather Advisory | RNK | 34 hr |
| Jan 6, 1:49 PM EST | Winter Weather Advisory | LWX | 29 hr |
| Jan 7, 2:07 PM EST | Wind Advisory | RNK | 28 hr |
| Jan 8, 3:40 AM EST | Wind Advisory | LWX | 13 hr |
| Jan 10, 2:43 PM EST | Wind Advisory | RNK | 37 hr |
| Jan 11, 3:38 AM EST | High Wind Watch | LWX | 10 hr |
| Jan 11, 1:13 PM EST | Wind Advisory | LWX | 20 hr |
| Jan 11, 7:37 PM EST | Severe Thunderstorm Watch | SPC | 5 hr |
| Jan 11, 10:33 PM EST | Severe Thunderstorm Warning | RNK | 57 min |
| Jan 11, 10:59 PM EST | Mesoscale Discussion | SPC | 91 min |
| Jan 11, 11:27 PM EST | Severe Thunderstorm Warning | RNK | 63 min |
| Jan 15, 2:30 PM EST | Wind Advisory | RNK | 34 hr |
| Jan 15, 2:50 PM EST | Wind Advisory | LWX | 22 hr |
| Jan 17, 3:53 AM EST | Winter Weather Advisory | RNK | 35 hr |
| Jan 17, 1:33 PM EST | Winter Weather Advisory | LWX | 29 hr |
| Feb 2, 9:15 AM EST | Wind Advisory | RNK | 15 hr |
| Feb 2, 7:04 PM EST | Wind Advisory | LWX | 7 hr |
| Feb 5, 4:46 AM EST | Flood Watch | RNK | 49 hr |
| Feb 5, 3:23 PM EST | Flood Watch | LWX | 35 hr |
| Feb 6, 9:30 PM EST | Wind Advisory | LWX | 20 hr |
| Feb 6, 9:40 PM EST | Wind Advisory | RNK | 20 hr |
| Feb 7, 5:45 AM EST | Special Weather Statement | RNK | 45 min |
| Feb 26, 12:54 AM EST | Dense Fog Advisory | LWX | 8 hr |
| Feb 26, 3:15 AM EST | Wind Advisory | LWX | 31 hr |
| Feb 26, 3:36 AM EST | Dense Fog Advisory | RNK | 5 hr |
| Feb 26, 3:36 AM EST | Wind Advisory | RNK | 39 hr |
| Feb 26, 2:49 PM EST | Mesoscale Discussion | SPC | 116 min |
| Mar 30, 12:41 PM EDT | Red Flag Warning | RNK | 7 hr |
| Apr 6, 1:59 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 7, 4:42 PM EDT | Special Weather Statement | RNK | 33 min |
| Apr 7, 10:41 PM EDT | Special Weather Statement | RNK | 49 min |
| Apr 8, 6:15 AM EDT | Severe Thunderstorm Warning | RNK | 60 min |
| Apr 8, 8:13 PM EDT | Wind Advisory | LWX | 23 hr |
| Apr 9, 1:47 AM EDT | Wind Advisory | RNK | 18 hr |
| Apr 9, 2:03 AM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Apr 9, 3:36 AM EDT | Mesoscale Discussion | SPC | 84 min |
| Apr 9, 4:21 AM EDT | Special Weather Statement | RNK | 54 min |
| Apr 9, 7:38 PM EDT | Wind Advisory | LWX | 22 hr |
| Apr 9, 7:47 PM EDT | Freeze Watch | LWX | 19 hr |
| Apr 9, 9:27 PM EDT | Wind Advisory | RNK | 21 hr |
| Apr 10, 2:28 PM EDT | Freeze Warning | LWX | 19 hr |
| Apr 10, 2:31 PM EDT | Freeze Warning | RNK | 18 hr |
| Apr 12, 4:09 AM EDT | Flash Flood Watch | RNK | 27 hr |
| Apr 12, 4:47 AM EDT | High Wind Watch | LWX | 8 hr |
| Apr 12, 12:35 PM EDT | High Wind Warning | LWX | 26 hr |
| Apr 12, 12:35 PM EDT | Wind Advisory | LWX | 29 hr |
| Apr 12, 2:18 PM EDT | Wind Advisory | RNK | 26 hr |
| Apr 13, 1:33 AM EDT | Special Weather Statement | RNK | 27 min |
| Apr 13, 1:51 AM EDT | Flash Flood Watch | LWX | 5 hr |
| Apr 13, 2:03 AM EDT | Special Weather Statement | RNK | 27 min |
| Apr 13, 2:14 AM EDT | Areal Flood Advisory | RNK | 12 hr |
| Apr 13, 6:21 AM EDT | Flash Flood Warning | RNK | 4 hr |
| Apr 13, 11:15 AM EDT | Special Weather Statement | RNK | 30 min |
| Apr 14, 4:25 AM EDT | Winter Weather Advisory | LWX | 27 hr |
| Apr 15, 3:13 AM EDT | Freeze Watch | LWX | 10 hr |
| Apr 15, 1:09 PM EDT | Freeze Watch | LWX | 24 hr |
| Apr 15, 1:09 PM EDT | Freeze Warning | LWX | 18 hr |
| Apr 16, 1:19 PM EDT | Freeze Warning | LWX | 20 hr |
| Apr 16, 3:00 PM EDT | Freeze Warning | RNK | 18 hr |
| Apr 18, 2:37 PM EDT | Frost Advisory | RNK | 18 hr |
| Apr 18, 9:22 PM EDT | Freeze Warning | LWX | 12 hr |
| Apr 21, 3:25 AM EDT | Wind Advisory | RNK | 19 hr |
| Apr 21, 4:04 AM EDT | Freeze Warning | LWX | 27 hr |
| Apr 29, 4:24 AM EDT | Flood Watch | LWX | 39 hr |
| Apr 29, 4:44 AM EDT | Flood Watch | RNK | 29 hr |
| Apr 30, 6:33 AM EDT | Areal Flood Advisory | RNK | 4 hr |
| May 7, 4:29 AM EDT | Freeze Watch | LWX | 10 hr |
| May 7, 2:16 PM EDT | Freeze Warning | LWX | 43 hr |
| May 8, 3:30 AM EDT | Freeze Watch | LWX | 24 hr |
| May 8, 1:52 PM EDT | Freeze Watch | RNK | 13 hr |
| May 9, 3:00 AM EDT | Freeze Warning | RNK | 31 hr |
| May 9, 3:36 AM EDT | Freeze Warning | LWX | 28 hr |
| May 10, 1:47 PM EDT | Freeze Watch | LWX | 14 hr |
| May 11, 3:43 AM EDT | Freeze Warning | LWX | 29 hr |
| May 14, 6:50 PM EDT | Special Weather Statement | RNK | 40 min |
| May 16, 4:25 PM EDT | Special Weather Statement | RNK | 35 min |
| May 16, 4:46 PM EDT | Areal Flood Advisory | RNK | 119 min |
| May 16, 4:59 PM EDT | Special Weather Statement | RNK | 31 min |
| May 16, 5:33 PM EDT | Special Weather Statement | RNK | 27 min |
| May 18, 2:23 PM EDT | Flash Flood Watch | RNK | 3 days |
| May 21, 3:48 AM EDT | Flash Flood Watch | LWX | 15 hr |
| May 22, 3:50 AM EDT | Dense Fog Advisory | RNK | 5 hr |
| May 23, 2:56 AM EDT | Dense Fog Advisory | RNK | 6 hr |
| May 23, 4:09 AM EDT | Dense Fog Advisory | LWX | 4 hr |
| May 24, 1:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 27, 3:25 AM EDT | Flash Flood Watch | RNK | 23 hr |
| Jun 4, 2:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 4, 2:43 PM EDT | Severe Thunderstorm Warning | RNK | 62 min |
| Jun 4, 3:32 PM EDT | Severe Thunderstorm Warning | RNK | 58 min |
| Jun 4, 3:49 PM EDT | Special Weather Statement | RNK | 26 min |
| Jun 5, 3:40 AM EDT | Flash Flood Watch | LWX | 17 hr |
| Jun 5, 5:08 AM EDT | Flash Flood Watch | RNK | 15 hr |
| Jun 5, 1:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 4:30 PM EDT | Severe Thunderstorm Warning | RNK | 45 min |
| Jun 6, 6:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 9, 9:56 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Jun 20, 10:45 AM EDT | Flash Flood Watch | LWX | 10 hr |
| Jun 20, 12:47 PM EDT | Flash Flood Watch | RNK | 8 hr |
| Jun 25, 1:48 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 1, 8:13 PM EDT | Severe Thunderstorm Warning | RNK | 47 min |
| Jul 1, 9:53 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Jul 5, 7:27 PM EDT | Special Weather Statement | RNK | 33 min |
| Jul 5, 10:05 PM EDT | Special Weather Statement | RNK | 25 min |
| Jul 5, 10:33 PM EDT | Special Weather Statement | RNK | 27 min |
| Jul 10, 7:16 PM EDT | Severe Thunderstorm Warning | RNK | 59 min |
| Jul 10, 8:15 PM EDT | Severe Thunderstorm Warning | RNK | 60 min |
| Jul 17, 1:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 17, 2:15 PM EDT | Severe Thunderstorm Warning | RNK | 45 min |
| Jul 18, 3:11 PM EDT | Heat Advisory | RNK | 30 hr |
| Jul 19, 3:04 PM EDT | Heat Advisory | RNK | 30 hr |
| Jul 21, 1:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 10:48 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 22, 1:36 PM EDT | Flash Flood Watch | LWX | 4 hr |
| Jul 22, 3:02 PM EDT | Severe Thunderstorm Warning | RNK | 58 min |
| Jul 23, 6:20 PM EDT | Special Weather Statement | RNK | 25 min |
| Jul 24, 4:22 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 24, 6:29 PM EDT | Severe Thunderstorm Warning | RNK | 61 min |
| Jul 24, 7:15 PM EDT | Severe Thunderstorm Warning | RNK | 60 min |
| Jul 28, 3:19 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 28, 4:20 PM EDT | Severe Thunderstorm Warning | RNK | 55 min |
| Jul 30, 10:01 PM EDT | Flash Flood Watch | LWX | 20 hr |
| Jul 31, 1:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 1, 6:53 PM EDT | Flash Flood Watch | LWX | 7 hr |
| Aug 2, 4:55 AM EDT | Flash Flood Watch | RNK | 50 hr |
| Aug 2, 2:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Aug 2, 3:28 PM EDT | Flash Flood Watch | LWX | 45 hr |
| Aug 3, 3:09 PM EDT | Special Weather Statement | RNK | 36 min |
| Aug 3, 3:32 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Aug 5, 10:51 PM EDT | Flash Flood Watch | LWX | 25 hr |
| Aug 6, 2:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 6, 10:45 PM EDT | Areal Flood Advisory | RNK | 117 min |
| Aug 7, 3:46 AM EDT | Flash Flood Watch | LWX | 21 hr |
| Aug 7, 9:04 PM EDT | Severe Thunderstorm Warning | RNK | 56 min |
| Aug 7, 9:42 PM EDT | Special Weather Statement | RNK | 33 min |
| Aug 11, 3:19 PM EDT | Flash Flood Watch | LWX | 52 hr |
| Aug 12, 2:42 AM EDT | Areal Flood Advisory | RNK | 3 hr |
| Aug 12, 4:07 AM EDT | Flash Flood Watch | RNK | 19 hr |
| Aug 12, 1:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 6:42 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Aug 13, 2:50 AM EDT | Flash Flood Watch | RNK | 21 hr |
| Aug 14, 3:48 AM EDT | Flash Flood Watch | RNK | 41 hr |
| Aug 14, 9:58 PM EDT | Flash Flood Watch | LWX | 16 hr |
| Aug 19, 4:29 PM EDT | Areal Flood Advisory | RNK | 2 hr |
| Aug 21, 4:15 AM EDT | Flash Flood Watch | RNK | 26 hr |
| Aug 21, 4:20 AM EDT | Flash Flood Watch | LWX | 24 hr |
| Aug 22, 12:09 PM EDT | Flash Flood Watch | LWX | 12 hr |
| Aug 22, 8:33 PM EDT | Areal Flood Advisory | RNK | 106 min |
| Aug 22, 8:47 PM EDT | Areal Flood Advisory | RNK | 12 min |
| Aug 22, 8:59 PM EDT | Flash Flood Warning | RNK | 3 hr |
| Aug 22, 10:04 PM EDT | Special Weather Statement | RNK | 26 min |
| Aug 24, 7:14 PM EDT | Severe Thunderstorm Warning | RNK | 61 min |
| Aug 24, 8:27 PM EDT | Areal Flood Advisory | RNK | 82 min |
| Aug 25, 3:34 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 25, 7:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Aug 25, 8:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 28, 6:42 PM EDT | Special Weather Statement | RNK | 33 min |
| Aug 28, 7:18 PM EDT | Special Weather Statement | RNK | 42 min |
| Aug 28, 7:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 28, 8:05 PM EDT | Special Weather Statement | RNK | 25 min |
| Aug 28, 11:27 PM EDT | Special Weather Statement | RNK | 18 min |
| Aug 30, 7:21 PM EDT | Flood Watch | LWX | 26 hr |
| Aug 30, 7:55 PM EDT | Flood Watch | RNK | 26 hr |
| Aug 31, 12:16 PM EDT | Areal Flood Advisory | RNK | 4 hr |
| Aug 31, 2:51 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Sep 3, 3:06 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Sep 20, 1:43 PM EDT | Frost Advisory | LWX | 19 hr |
| Sep 29, 2:36 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 13, 2:32 AM EDT | Dense Fog Advisory | RNK | 6 hr |
| Oct 16, 2:39 PM EDT | Frost Advisory | LWX | 19 hr |
| Oct 17, 1:59 PM EDT | Frost Advisory | RNK | 19 hr |
| Oct 17, 2:25 PM EDT | Frost Advisory | LWX | 20 hr |
| Oct 26, 8:53 PM EDT | Dense Fog Advisory | RNK | 13 hr |
| Oct 27, 9:51 PM EDT | Dense Fog Advisory | RNK | 12 hr |
| Oct 28, 5:33 AM EDT | Flood Watch | RNK | 32 hr |
| Oct 28, 3:05 PM EDT | Flood Watch | LWX | 25 hr |
| Oct 29, 8:44 PM EDT | Frost Advisory | LWX | 36 hr |
| Oct 30, 2:32 PM EDT | Frost Advisory | RNK | 19 hr |
| Oct 31, 6:59 PM EDT | Wind Advisory | LWX | 44 hr |
| Nov 1, 3:33 AM EST | Freeze Warning | RNK | 29 hr |
| Nov 2, 1:49 PM EST | Freeze Warning | RNK | 17 hr |
| Nov 9, 4:44 AM EST | Dense Fog Advisory | LWX | 5 hr |
| Nov 11, 9:36 AM EST | Areal Flood Advisory | RNK | 3 hr |
| Nov 11, 10:37 AM EST | Flash Flood Watch | RNK | 25 hr |
| Nov 11, 10:46 AM EST | Flash Flood Watch | LWX | 16 hr |
| Nov 11, 6:08 PM EST | Areal Flood Warning | RNK | 6 hr |
| Nov 11, 9:15 PM EST | Areal Flood Advisory | RNK | 3 hr |
| Nov 14, 2:06 PM EST | Wind Advisory | LWX | 41 hr |
| Nov 14, 2:06 PM EST | Wind Advisory | RNK | 44 hr |
| Nov 30, 8:08 AM EST | Special Weather Statement | RNK | 37 min |
| Nov 30, 1:16 PM EST | Flash Flood Watch | RNK | 4 hr |
| Dec 13, 2:25 PM EST | Winter Weather Advisory | LWX | 23 hr |
| Dec 14, 4:43 AM EST | Winter Storm Watch | LWX | 35 hr |
| Dec 14, 2:26 PM EST | Winter Storm Watch | RNK | 14 hr |
| Dec 15, 4:09 AM EST | Winter Storm Warning | LWX | 46 hr |
| Dec 15, 4:35 AM EST | Winter Storm Warning | RNK | 41 hr |
| Dec 16, 6:36 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 18, 5:27 AM EST | Dense Fog Advisory | LWX | 14 hr |
| Dec 21, 5:05 AM EST | Wind Advisory | RNK | 31 hr |
| Dec 23, 4:27 AM EST | Flash Flood Watch | LWX | 47 hr |
| Dec 23, 3:15 PM EST | Flash Flood Watch | RNK | 33 hr |
| Dec 23, 9:07 PM EST | Wind Advisory | LWX | 29 hr |
| Dec 24, 8:55 PM EST | Special Weather Statement | RNK | 80 min |
| Dec 24, 11:51 PM EST | Special Weather Statement | RNK | 84 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 | 16 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 24 |
| Special Weather Statement | 27 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 29 |
| Flood Watch | 8 |
| Areal Flood Advisory | 17 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 6 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 13 |
| Freeze Watch | 7 |
| Frost Advisory | 7 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 2 |
| Wind Advisory | 25 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 10 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.