Alert archive / Virginia / Appomattox County
Weather alerts in Appomattox County, Virginia, 2020
136 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Appomattox County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 136
- Warnings
- 30
- Watches
- 13
- Advisories
- 30
- Busiest month
- July30 alerts
- Busiest day
- November 11, 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.
Appomattox County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 15 | 14 | 7% | 19 | 68% | 14 min |
| Flash flood warnings | 3 | 2 | 33% | 4 | 100% | 160 min |
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, 2:44 PM EST | Special Weather Statement | RNK | 61 min |
| Jan 6, 3:35 AM EST | Winter Weather Advisory | RNK | 34 hr |
| Jan 7, 2:07 PM EST | Wind Advisory | RNK | 28 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 12, 12:28 AM EST | Severe Thunderstorm Warning | RNK | 32 min |
| Feb 5, 4:46 AM EST | Flood Watch | RNK | 49 hr |
| Feb 6, 9:40 PM EST | Wind Advisory | RNK | 20 hr |
| Feb 26, 3:36 AM EST | Dense Fog Advisory | RNK | 5 hr |
| Feb 26, 2:49 PM EST | Mesoscale Discussion | SPC | 116 min |
| Feb 26, 8:44 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Apr 6, 1:59 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 6, 2:55 PM EDT | Special Weather Statement | RNK | 35 min |
| Apr 7, 12:17 PM EDT | Special Weather Statement | RNK | 28 min |
| Apr 7, 2:07 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Apr 8, 6:36 AM EDT | Severe Thunderstorm Warning | RNK | 54 min |
| Apr 9, 4:56 AM EDT | Special Weather Statement | RNK | 64 min |
| Apr 10, 2:31 PM EDT | Freeze Warning | RNK | 18 hr |
| Apr 12, 2:18 PM EDT | Wind Advisory | RNK | 26 hr |
| Apr 13, 2:14 AM EDT | Areal Flood Advisory | RNK | 12 hr |
| Apr 13, 5:01 AM EDT | Tornado Watch | SPC | 7 hr |
| Apr 13, 5:30 AM EDT | Severe Thunderstorm Warning | RNK | 60 min |
| Apr 16, 3:00 PM EDT | Freeze Warning | RNK | 18 hr |
| Apr 18, 2:37 PM EDT | Frost Advisory | RNK | 18 hr |
| Apr 26, 1:06 AM EDT | Special Weather Statement | RNK | 24 min |
| Apr 30, 4:40 AM EDT | Special Weather Statement | RNK | 65 min |
| Apr 30, 6:33 AM EDT | Areal Flood Advisory | RNK | 4 hr |
| May 8, 1:52 PM EDT | Freeze Watch | RNK | 13 hr |
| May 9, 3:00 AM EDT | Freeze Warning | RNK | 31 hr |
| May 22, 3:50 AM EDT | Dense Fog Advisory | RNK | 5 hr |
| May 24, 1:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 4, 2:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 4, 2:38 PM EDT | Severe Thunderstorm Warning | RNK | 39 min |
| Jun 5, 1:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 6, 6:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 20, 12:47 PM EDT | Flash Flood Watch | RNK | 8 hr |
| Jun 25, 8:22 PM EDT | Special Weather Statement | RNK | 38 min |
| Jun 25, 8:31 PM EDT | Severe Thunderstorm Warning | RNK | 30 min |
| Jul 1, 1:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jul 5, 6:51 PM EDT | Special Weather Statement | RNK | 24 min |
| Jul 5, 8:35 PM EDT | Severe Thunderstorm Warning | RNK | 55 min |
| Jul 10, 6:57 PM EDT | Special Weather Statement | RNK | 33 min |
| Jul 10, 8:15 PM EDT | Severe Thunderstorm Warning | RNK | 60 min |
| Jul 10, 8:52 PM EDT | Special Weather Statement | RNK | 53 min |
| Jul 17, 1:37 PM EDT | Special Weather Statement | RNK | 23 min |
| Jul 17, 1:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 17, 1:59 PM EDT | Special Weather Statement | RNK | 31 min |
| Jul 17, 2:15 PM EDT | Severe Thunderstorm Warning | RNK | 45 min |
| Jul 17, 2:43 PM EDT | Severe Thunderstorm Warning | RNK | 47 min |
| Jul 18, 3:11 PM EDT | Heat Advisory | RNK | 30 hr |
| Jul 19, 3:04 PM EDT | Heat Advisory | RNK | 30 hr |
| Jul 20, 9:38 PM EDT | Heat Advisory | RNK | 22 hr |
| Jul 21, 1:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 8:32 AM EDT | Heat Advisory | RNK | 10 hr |
| Jul 22, 10:48 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 22, 4:11 PM EDT | Special Weather Statement | RNK | 49 min |
| Jul 22, 4:29 PM EDT | Severe Thunderstorm Warning | RNK | 61 min |
| Jul 22, 4:44 PM EDT | Severe Thunderstorm Warning | RNK | 61 min |
| Jul 23, 12:05 AM EDT | Special Weather Statement | RNK | 55 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, 5:49 PM EDT | Special Weather Statement | RNK | 41 min |
| Jul 28, 3:19 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 28, 3:28 PM EDT | Special Weather Statement | RNK | 32 min |
| Jul 28, 3:34 PM EDT | Severe Thunderstorm Warning | RNK | 56 min |
| Jul 28, 9:29 PM EDT | Special Weather Statement | RNK | 31 min |
| Jul 31, 1:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 31, 5:28 PM EDT | Special Weather Statement | RNK | 32 min |
| Aug 2, 4:55 AM EDT | Flash Flood Watch | RNK | 50 hr |
| Aug 2, 2:08 PM EDT | Special Weather Statement | RNK | 37 min |
| Aug 2, 2:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Aug 3, 1:34 PM EDT | Special Weather Statement | RNK | 41 min |
| Aug 6, 2:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 6, 6:01 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 6, 7:17 PM EDT | Special Weather Statement | RNK | 43 min |
| Aug 7, 10:33 PM EDT | Special Weather Statement | RNK | 57 min |
| Aug 12, 2:10 AM EDT | Special Weather Statement | RNK | 35 min |
| 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 13, 2:50 AM EDT | Flash Flood Watch | RNK | 21 hr |
| Aug 13, 7:10 AM EDT | Special Weather Statement | RNK | 35 min |
| Aug 13, 7:32 AM EDT | Areal Flood Advisory | RNK | 118 min |
| Aug 14, 3:48 AM EDT | Flash Flood Watch | RNK | 41 hr |
| Aug 19, 6:22 AM EDT | Special Weather Statement | RNK | 38 min |
| Aug 22, 1:16 AM EDT | Special Weather Statement | RNK | 59 min |
| Aug 22, 2:40 AM EDT | Special Weather Statement | RNK | 65 min |
| Aug 22, 11:10 PM EDT | Special Weather Statement | RNK | 65 min |
| Aug 24, 7:14 PM EDT | Severe Thunderstorm Warning | RNK | 61 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 27, 4:23 PM EDT | Special Weather Statement | RNK | 37 min |
| Aug 28, 7:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 31, 2:51 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Sep 2, 5:28 PM EDT | Special Weather Statement | RNK | 32 min |
| Sep 2, 5:58 PM EDT | Special Weather Statement | RNK | 32 min |
| Sep 17, 5:19 PM EDT | Areal Flood Warning | RNK | 6 hr |
| Sep 17, 6:56 PM EDT | Areal Flood Warning | RNK | 5 hr |
| Sep 25, 10:58 PM EDT | Areal Flood Advisory | RNK | 6 hr |
| Sep 29, 2:36 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 29, 4:39 PM EDT | Special Weather Statement | RNK | 36 min |
| Sep 29, 5:16 PM EDT | Special Weather Statement | RNK | 44 min |
| Oct 11, 3:28 PM EDT | Special Weather Statement | RNK | 32 min |
| Oct 13, 2:32 AM EDT | Dense Fog Advisory | RNK | 6 hr |
| Oct 17, 1:59 PM EDT | Frost Advisory | RNK | 19 hr |
| Oct 25, 2:29 AM EDT | Areal Flood Advisory | RNK | 6 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 29, 11:46 AM EDT | Areal Flood Advisory | RNK | 3 hr |
| Oct 29, 8:57 PM EDT | Areal Flood Advisory | RNK | 108 min |
| Oct 30, 2:28 AM EDT | Areal Flood Warning | RNK | 7 hr |
| Nov 1, 3:33 AM EST | Freeze Warning | RNK | 29 hr |
| Nov 2, 1:49 PM EST | Freeze Warning | RNK | 17 hr |
| Nov 11, 9:36 AM EST | Areal Flood Advisory | RNK | 3 hr |
| Nov 11, 10:32 AM EST | Special Weather Statement | RNK | 118 min |
| Nov 11, 10:37 AM EST | Flash Flood Watch | RNK | 25 hr |
| Nov 11, 11:04 AM EST | Areal Flood Advisory | RNK | 3 hr |
| Nov 11, 4:28 PM EST | Areal Flood Advisory | RNK | 4 hr |
| Nov 11, 5:19 PM EST | Flash Flood Warning | RNK | 6 hr |
| Nov 11, 6:08 PM EST | Areal Flood Warning | RNK | 6 hr |
| Nov 11, 7:12 PM EST | Flash Flood Warning | RNK | 6 hr |
| Nov 11, 11:55 PM EST | Flash Flood Warning | RNK | 10 hr |
| Nov 12, 10:08 AM EST | Areal Flood Warning | RNK | 6 hr |
| Nov 12, 3:43 PM EST | Areal Flood Warning | RNK | 6 hr |
| Nov 12, 9:35 PM EST | Areal Flood Warning | RNK | 12 hr |
| Nov 30, 8:08 AM EST | Special Weather Statement | RNK | 37 min |
| Dec 14, 8:36 AM EST | Special Weather Statement | RNK | 54 min |
| Dec 14, 9:37 AM EST | Areal Flood Advisory | RNK | 113 min |
| Dec 15, 4:35 AM EST | Winter Weather Advisory | RNK | 41 hr |
| Dec 17, 1:04 AM EST | Freezing Fog Advisory | RNK | 9 hr |
| Dec 23, 3:15 PM EST | Flash Flood Watch | RNK | 33 hr |
| 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 | 15 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 24 |
| Special Weather Statement | 39 |
| Flooding | |
| Areal Flood Warning | 7 |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 7 |
| Flood Watch | 2 |
| Areal Flood Advisory | 13 |
| Winter | |
| Winter Weather Advisory | 2 |
| Heat | |
| Heat Advisory | 4 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
| Freezing Fog Advisory | 1 |
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.