Alert archive / Virginia / Louisa County
Weather alerts in Louisa County, Virginia, 2020
117 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Louisa County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 117
- Warnings
- 18
- Watches
- 15
- Advisories
- 20
- Busiest month
- August26 alerts
- Busiest day
- August 6, 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.
Louisa County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 9 | 8 | 11% | 6 | 100% | 21 min |
| Flash flood warnings | 1 | 1 | 0% | 3 | 67% | 134 min |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Wakefield, VA: tornado warnings | 60 | 19 | 68% | 39 | 72% | 17 min |
| NWS Wakefield, VA: severe thunderstorm warnings | 170 | 120 | 29% | 237 | 91% | 19 min |
| NWS Wakefield, VA: flash flood warnings | 87 | 57 | 34% | 118 | 92% | 79 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 7, 2:21 AM EST | Winter Weather Advisory | AKQ | 13 hr |
| Jan 11, 10:59 PM EST | Mesoscale Discussion | SPC | 91 min |
| Jan 11, 11:25 PM EST | Severe Thunderstorm Watch | SPC | 4 hr |
| Jan 11, 11:30 PM EST | Special Weather Statement | AKQ | 45 min |
| Jan 11, 11:47 PM EST | Severe Thunderstorm Warning | AKQ | 43 min |
| Jan 12, 12:37 AM EST | Special Weather Statement | AKQ | 38 min |
| Jan 14, 6:17 AM EST | Special Weather Statement | AKQ | 43 min |
| Jan 15, 4:44 AM EST | Dense Fog Advisory | AKQ | 4 hr |
| Feb 5, 3:45 PM EST | Flood Watch | AKQ | 37 hr |
| Feb 6, 2:42 PM EST | Wind Advisory | AKQ | 27 hr |
| Feb 7, 7:30 AM EST | Special Weather Statement | AKQ | 45 min |
| Feb 26, 1:08 AM EST | Dense Fog Advisory | AKQ | 12 hr |
| Feb 26, 2:49 PM EST | Mesoscale Discussion | SPC | 116 min |
| Feb 26, 8:44 PM EST | Mesoscale Discussion | SPC | 2 hr |
| Apr 7, 2:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 8, 6:23 AM EDT | Special Weather Statement | AKQ | 37 min |
| Apr 10, 2:54 PM EDT | Freeze Warning | AKQ | 18 hr |
| Apr 12, 2:25 PM EDT | Wind Advisory | AKQ | 26 hr |
| Apr 13, 3:44 AM EDT | Special Weather Statement | AKQ | 46 min |
| Apr 13, 6:55 AM EDT | Severe Thunderstorm Warning | AKQ | 50 min |
| Apr 13, 10:34 AM EDT | Mesoscale Discussion | SPC | 86 min |
| Apr 16, 3:00 AM EDT | Freeze Watch | AKQ | 12 hr |
| Apr 16, 3:12 PM EDT | Freeze Warning | AKQ | 18 hr |
| Apr 18, 9:31 PM EDT | Frost Advisory | AKQ | 10 hr |
| Apr 21, 11:50 AM EDT | Freeze Warning | AKQ | 20 hr |
| Apr 29, 3:23 AM EDT | Flood Watch | AKQ | 39 hr |
| May 8, 3:33 AM EDT | Freeze Watch | AKQ | 24 hr |
| May 8, 9:10 PM EDT | Special Weather Statement | AKQ | 50 min |
| May 9, 3:26 AM EDT | Freeze Warning | AKQ | 29 hr |
| May 11, 3:14 AM EDT | Frost Advisory | AKQ | 27 hr |
| Jun 4, 2:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 5, 1:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 6:36 PM EDT | Special Weather Statement | AKQ | 39 min |
| Jun 5, 7:39 PM EDT | Special Weather Statement | AKQ | 51 min |
| Jun 6, 6:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 19, 5:01 PM EDT | Special Weather Statement | AKQ | 59 min |
| Jun 19, 6:05 PM EDT | Severe Thunderstorm Warning | AKQ | 40 min |
| Jun 19, 9:16 PM EDT | Special Weather Statement | AKQ | 44 min |
| Jun 20, 6:31 PM EDT | Special Weather Statement | AKQ | 44 min |
| Jun 20, 7:16 PM EDT | Areal Flood Advisory | AKQ | 3 hr |
| Jun 22, 1:58 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 22, 6:59 PM EDT | Special Weather Statement | AKQ | 31 min |
| Jun 25, 1:48 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 25, 6:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 25, 7:29 PM EDT | Special Weather Statement | AKQ | 46 min |
| Jun 25, 7:36 PM EDT | Severe Thunderstorm Warning | AKQ | 39 min |
| Jul 1, 1:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jul 5, 1:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 6, 1:38 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 6, 4:33 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 17, 1:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 18, 3:09 PM EDT | Heat Advisory | AKQ | 30 hr |
| Jul 19, 2:40 PM EDT | Heat Advisory | AKQ | 30 hr |
| Jul 20, 8:46 PM EDT | Heat Advisory | AKQ | 70 hr |
| Jul 21, 6:33 PM EDT | Special Weather Statement | AKQ | 27 min |
| Jul 21, 6:58 PM EDT | Special Weather Statement | AKQ | 32 min |
| Jul 22, 10:48 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 22, 2:29 PM EDT | Special Weather Statement | AKQ | 46 min |
| Jul 22, 3:23 PM EDT | Special Weather Statement | AKQ | 37 min |
| Jul 22, 4:05 PM EDT | Special Weather Statement | AKQ | 55 min |
| Jul 22, 4:59 PM EDT | Special Weather Statement | AKQ | 61 min |
| Jul 23, 6:14 PM EDT | Special Weather Statement | AKQ | 61 min |
| Jul 23, 7:05 PM EDT | Special Weather Statement | AKQ | 55 min |
| Jul 23, 7:16 PM EDT | Special Weather Statement | AKQ | 59 min |
| Jul 23, 7:57 PM EDT | Special Weather Statement | AKQ | 48 min |
| Jul 24, 4:22 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 28, 3:19 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 28, 5:29 PM EDT | Special Weather Statement | AKQ | 46 min |
| Jul 28, 6:03 PM EDT | Severe Thunderstorm Warning | AKQ | 42 min |
| Jul 28, 6:35 PM EDT | Severe Thunderstorm Warning | AKQ | 40 min |
| Jul 31, 1:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 1, 7:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 2, 2:18 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Aug 2, 3:26 PM EDT | Flash Flood Watch | AKQ | 43 hr |
| Aug 2, 3:26 PM EDT | Special Weather Statement | AKQ | 34 min |
| Aug 3, 2:23 PM EDT | Special Weather Statement | AKQ | 67 min |
| Aug 6, 10:43 AM EDT | Flash Flood Watch | AKQ | 15 hr |
| Aug 6, 2:08 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 6, 5:18 PM EDT | Severe Thunderstorm Warning | AKQ | 42 min |
| Aug 6, 5:57 PM EDT | Severe Thunderstorm Warning | AKQ | 31 min |
| Aug 6, 6:01 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 6, 6:32 PM EDT | Special Weather Statement | AKQ | 43 min |
| Aug 6, 6:58 PM EDT | Areal Flood Advisory | AKQ | 3 hr |
| Aug 7, 2:43 AM EDT | Flash Flood Watch | AKQ | 19 hr |
| Aug 12, 3:13 AM EDT | Flash Flood Watch | AKQ | 19 hr |
| Aug 12, 1:15 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 5:11 PM EDT | Areal Flood Advisory | AKQ | 2 hr |
| Aug 13, 2:25 AM EDT | Flash Flood Watch | AKQ | 17 hr |
| Aug 13, 9:38 AM EDT | Special Weather Statement | AKQ | 52 min |
| Aug 13, 11:00 AM EDT | Areal Flood Advisory | AKQ | 3 hr |
| 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, 8:06 PM EDT | Special Weather Statement | AKQ | 39 min |
| Aug 25, 8:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 28, 7:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 29, 12:17 AM EDT | Special Weather Statement | AKQ | 43 min |
| Aug 31, 10:29 AM EDT | Special Weather Statement | AKQ | 61 min |
| Sep 3, 3:06 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Sep 4, 5:52 PM EDT | Special Weather Statement | AKQ | 53 min |
| Sep 29, 2:36 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 29, 5:52 PM EDT | Severe Thunderstorm Warning | AKQ | 38 min |
| Sep 29, 6:30 PM EDT | Special Weather Statement | AKQ | 45 min |
| Oct 17, 3:42 PM EDT | Frost Advisory | AKQ | 17 hr |
| Oct 21, 12:37 AM EDT | Dense Fog Advisory | AKQ | 9 hr |
| Oct 27, 1:30 AM EDT | Dense Fog Advisory | AKQ | 10 hr |
| Oct 28, 3:37 PM EDT | Flood Watch | AKQ | 24 hr |
| Oct 29, 10:54 AM EDT | Special Weather Statement | AKQ | 51 min |
| Oct 30, 2:04 PM EDT | Frost Advisory | AKQ | 19 hr |
| Nov 2, 1:43 PM EST | Freeze Warning | AKQ | 18 hr |
| Nov 11, 10:30 AM EST | Flash Flood Watch | AKQ | 31 hr |
| Nov 11, 8:04 PM EST | Areal Flood Advisory | AKQ | 9 hr |
| Nov 11, 8:16 PM EST | Flash Flood Warning | AKQ | 5 hr |
| Nov 12, 1:37 AM EST | Areal Flood Warning | AKQ | 7 hr |
| Nov 12, 6:13 AM EST | Areal Flood Warning | AKQ | 6 hr |
| Nov 12, 11:59 AM EST | Areal Flood Warning | AKQ | 29 hr |
| Dec 15, 4:52 AM EST | Winter Weather Advisory | AKQ | 42 hr |
| Dec 23, 2:36 PM EST | Flash Flood Watch | AKQ | 33 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 | 9 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 29 |
| Special Weather Statement | 35 |
| Flooding | |
| Areal Flood Warning | 3 |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 7 |
| Flood Watch | 3 |
| Areal Flood Advisory | 5 |
| Winter | |
| Winter Weather Advisory | 2 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 2 |
| Frost Advisory | 4 |
| Wind and dust | |
| Wind Advisory | 2 |
| 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 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.