Alert archive / West Virginia / Mercer County
Weather alerts in Mercer County, West Virginia, 2020
137 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Mercer County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 137
- Warnings
- 28
- Watches
- 21
- Advisories
- 41
- Busiest month
- May26 alerts
- Busiest day
- April 8, 20206 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Mercer County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 11 | 8 | 27% | 3 | 100% | 27 min |
| Flash flood warnings | 0 | 2 | 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 6, 3:35 AM EST | Winter Weather Advisory | RNK | 34 hr |
| Jan 7, 8:49 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 7, 2:07 PM EST | Wind Advisory | RNK | 28 hr |
| Jan 10, 2:43 PM EST | Wind Advisory | RNK | 37 hr |
| Jan 11, 7:37 PM EST | Severe Thunderstorm Watch | SPC | 5 hr |
| Jan 11, 8:04 PM EST | Severe Thunderstorm Warning | RNK | 43 min |
| Jan 17, 3:53 AM EST | Winter Weather Advisory | RNK | 35 hr |
| Jan 23, 3:19 PM EST | Wind Advisory | RNK | 27 hr |
| Feb 2, 9:15 AM EST | Wind Advisory | RNK | 15 hr |
| Feb 5, 4:46 AM EST | Flood Watch | RNK | 49 hr |
| Feb 6, 8:38 AM EST | Areal Flood Warning | RNK | 12 hr |
| Feb 6, 8:30 PM EST | Areal Flood Warning | RNK | 15 hr |
| Feb 6, 9:40 PM EST | Wind Advisory | RNK | 20 hr |
| Feb 7, 4:30 AM EST | Winter Weather Advisory | RNK | 20 hr |
| Feb 7, 11:42 AM EST | Areal Flood Warning | RNK | 15 hr |
| Feb 12, 11:10 PM EST | Special Weather Statement | RNK | 50 min |
| Feb 26, 3:41 AM EST | Winter Weather Advisory | RNK | 32 hr |
| Feb 26, 4:34 PM EST | Special Weather Statement | RNK | 56 min |
| Feb 27, 2:57 PM EST | Winter Weather Advisory | RNK | 45 hr |
| Mar 5, 2:59 PM EST | Winter Weather Advisory | RNK | 39 hr |
| Mar 29, 8:06 AM EDT | Special Weather Statement | RNK | 24 min |
| Apr 8, 12:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Apr 8, 1:10 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Apr 8, 3:50 PM EDT | Severe Thunderstorm Warning | RNK | 40 min |
| Apr 8, 4:05 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Apr 8, 4:22 PM EDT | Severe Thunderstorm Warning | RNK | 23 min |
| Apr 8, 4:33 PM EDT | Special Weather Statement | RNK | 12 min |
| Apr 9, 12:50 AM EDT | Mesoscale Discussion | SPC | 115 min |
| Apr 9, 2:03 AM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Apr 9, 2:14 AM EDT | Special Weather Statement | RNK | 31 min |
| Apr 9, 2:47 AM EDT | Severe Thunderstorm Warning | RNK | 43 min |
| Apr 12, 4:09 AM EDT | Flash Flood Watch | RNK | 27 hr |
| Apr 12, 2:18 PM EDT | Wind Advisory | RNK | 26 hr |
| Apr 13, 12:44 AM EDT | Areal Flood Advisory | RNK | 12 hr |
| Apr 13, 5:56 PM EDT | Areal Flood Warning | RNK | 6 hr |
| Apr 13, 11:40 PM EDT | Areal Flood Warning | RNK | 6 hr |
| Apr 13, 11:54 PM EDT | River Flood Warning | RNK | 28 hr |
| Apr 21, 12:12 PM EDT | Freeze Warning | RNK | 21 hr |
| Apr 25, 10:58 PM EDT | Special Weather Statement | RNK | 32 min |
| Apr 25, 11:27 PM EDT | Special Weather Statement | RNK | 33 min |
| Apr 29, 4:44 AM EDT | Flood Watch | RNK | 29 hr |
| Apr 29, 9:06 PM EDT | Special Weather Statement | RNK | 24 min |
| May 3, 9:44 PM EDT | Special Weather Statement | RNK | 31 min |
| May 3, 10:16 PM EDT | Special Weather Statement | RNK | 29 min |
| May 3, 10:39 PM EDT | Special Weather Statement | RNK | 36 min |
| May 5, 7:39 PM EDT | Special Weather Statement | RNK | 36 min |
| May 7, 4:57 AM EDT | Freeze Watch | RNK | 22 hr |
| May 8, 2:53 AM EDT | Freeze Warning | RNK | 31 hr |
| May 8, 1:52 PM EDT | Freeze Watch | RNK | 13 hr |
| May 9, 3:00 AM EDT | Freeze Warning | RNK | 31 hr |
| May 10, 2:14 PM EDT | Freeze Watch | RNK | 13 hr |
| May 11, 2:50 AM EDT | Freeze Warning | RNK | 28 hr |
| May 12, 6:41 AM EDT | Freeze Warning | RNK | 2 hr |
| May 19, 3:43 AM EDT | Wind Advisory | RNK | 24 hr |
| May 20, 5:10 AM EDT | Areal Flood Advisory | RNK | 4 hr |
| May 20, 11:28 AM EDT | River Flood Warning | RNK | 69 hr |
| May 21, 3:09 AM EDT | Areal Flood Advisory | RNK | 7 hr |
| May 22, 3:50 AM EDT | Dense Fog Advisory | RNK | 5 hr |
| May 24, 1:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 24, 6:45 PM EDT | Special Weather Statement | RNK | 30 min |
| May 24, 7:23 PM EDT | Special Weather Statement | RNK | 37 min |
| May 27, 3:25 AM EDT | Flash Flood Watch | RNK | 23 hr |
| May 28, 3:35 AM EDT | Areal Flood Advisory | RNK | 9 hr |
| May 28, 11:06 AM EDT | Areal Flood Advisory | RNK | 8 hr |
| May 28, 3:30 PM EDT | Severe Thunderstorm Warning | RNK | 38 min |
| May 28, 5:46 PM EDT | River Flood Warning | RNK | 22 hr |
| May 28, 6:57 PM EDT | Areal Flood Advisory | RNK | 4 hr |
| May 28, 10:56 PM EDT | Areal Flood Advisory | RNK | 4 hr |
| Jun 4, 7:03 PM EDT | Severe Thunderstorm Warning | RNK | 25 min |
| Jun 4, 7:48 PM EDT | Special Weather Statement | RNK | 27 min |
| Jun 5, 5:08 AM EDT | Flash Flood Watch | RNK | 15 hr |
| Jun 6, 6:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 9, 2:38 PM EDT | Special Weather Statement | RNK | 22 min |
| Jun 10, 11:19 PM EDT | Special Weather Statement | RNK | 41 min |
| Jun 14, 12:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 14, 12:57 PM EDT | Special Weather Statement | RNK | 48 min |
| Jun 14, 1:50 PM EDT | Special Weather Statement | RNK | 55 min |
| Jun 14, 2:40 PM EDT | Special Weather Statement | RNK | 65 min |
| Jun 14, 3:47 PM EDT | Special Weather Statement | RNK | 43 min |
| Jun 15, 1:14 AM EDT | Special Weather Statement | RNK | 2 hr |
| Jun 15, 2:01 AM EDT | Areal Flood Advisory | RNK | 5 hr |
| Jun 17, 6:00 PM EDT | Areal Flood Advisory | RNK | 8 hr |
| Jun 18, 10:18 PM EDT | Areal Flood Advisory | RNK | 7 hr |
| Jun 20, 12:47 PM EDT | Flash Flood Watch | RNK | 8 hr |
| Jun 21, 2:15 PM EDT | Special Weather Statement | RNK | 30 min |
| Jul 5, 5:02 PM EDT | Special Weather Statement | RNK | 43 min |
| Jul 6, 3:23 PM EDT | Special Weather Statement | RNK | 67 min |
| Jul 17, 1:47 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 22, 8:38 PM EDT | Severe Thunderstorm Warning | RNK | 52 min |
| Jul 22, 9:29 PM EDT | Special Weather Statement | RNK | 46 min |
| Jul 23, 1:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 3:05 PM EDT | Special Weather Statement | RNK | 55 min |
| Jul 27, 3:22 PM EDT | Special Weather Statement | RNK | 53 min |
| Jul 30, 7:21 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Aug 2, 4:55 AM EDT | Flash Flood Watch | RNK | 50 hr |
| Aug 6, 3:07 PM EDT | Special Weather Statement | RNK | 53 min |
| Aug 6, 3:13 PM EDT | Severe Thunderstorm Warning | RNK | 32 min |
| Aug 6, 3:38 PM EDT | Severe Thunderstorm Warning | RNK | 46 min |
| Aug 6, 3:45 PM EDT | Severe Thunderstorm Warning | RNK | 45 min |
| Aug 6, 4:13 PM EDT | Severe Thunderstorm Warning | RNK | 47 min |
| Aug 12, 2:14 AM EDT | Areal Flood Advisory | RNK | 92 min |
| Aug 12, 3:11 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, 4:50 PM EDT | Areal Flood Advisory | RNK | 3 hr |
| Aug 22, 12:08 PM EDT | Flash Flood Watch | RNK | 12 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, 8:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 25, 9:04 PM EDT | Special Weather Statement | RNK | 41 min |
| Aug 28, 2:13 PM EDT | Flash Flood Watch | RNK | 10 hr |
| Aug 28, 4:23 PM EDT | Special Weather Statement | RNK | 37 min |
| Aug 28, 7:50 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 2, 1:26 PM EDT | Special Weather Statement | RNK | 49 min |
| Sep 11, 9:10 PM EDT | Special Weather Statement | RNK | 35 min |
| Oct 2, 1:50 PM EDT | Frost Advisory | RNK | 19 hr |
| Oct 11, 12:56 AM EDT | Dense Fog Advisory | RNK | 9 hr |
| Oct 12, 2:39 AM EDT | Dense Fog Advisory | RNK | 7 hr |
| Oct 15, 2:56 PM EDT | Freeze Watch | RNK | 23 hr |
| Oct 16, 2:17 PM EDT | Freeze Warning | RNK | 20 hr |
| Oct 17, 1:59 PM EDT | Frost Advisory | RNK | 19 hr |
| Oct 28, 5:33 AM EDT | Flood Watch | RNK | 32 hr |
| Nov 1, 3:33 AM EST | Wind Advisory | RNK | 32 hr |
| Nov 11, 2:37 PM EST | Areal Flood Advisory | RNK | 5 hr |
| Nov 12, 10:08 AM EST | River Flood Warning | RNK | 20 hr |
| Nov 14, 2:06 PM EST | Wind Advisory | RNK | 44 hr |
| Nov 26, 8:43 PM EST | Dense Fog Advisory | RNK | 12 hr |
| Nov 30, 3:43 AM EST | Winter Weather Advisory | RNK | 39 hr |
| Dec 14, 2:26 PM EST | Winter Storm Watch | RNK | 14 hr |
| Dec 15, 4:35 AM EST | Winter Storm Warning | RNK | 41 hr |
| Dec 16, 7:47 AM EST | Special Weather Statement | RNK | 118 min |
| Dec 21, 5:05 AM EST | Wind Advisory | RNK | 31 hr |
| Dec 23, 2:51 PM EST | Winter Storm Warning | RNK | 39 hr |
| Dec 23, 2:51 PM EST | Winter Weather Advisory | RNK | 48 hr |
| Dec 23, 8:13 PM EST | Wind Advisory | RNK | 20 hr |
| Dec 24, 2:28 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 25, 3:17 PM EST | Wind Chill Advisory | RNK | 18 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 | 11 |
| Severe Thunderstorm Watch | 4 |
| Mesoscale Discussion | 13 |
| Special Weather Statement | 34 |
| Flooding | |
| Areal Flood Warning | 5 |
| River Flood Warning | 4 |
| Flash Flood Watch | 9 |
| Flood Watch | 3 |
| Areal Flood Advisory | 15 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 8 |
| Cold | |
| Freeze Warning | 6 |
| Freeze Watch | 4 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 11 |
| 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.