Alert archive / West Virginia / Mercer County
Weather alerts in Mercer County, West Virginia, 2009
146 weather alerts in 2009, 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 2009. Tap one for its archive.
- Alerts
- 146
- Warnings
- 36
- Watches
- 25
- Advisories
- 32
- Busiest month
- May30 alerts
- Busiest day
- May 9, 20097 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 1 tornado warnings covering Mercer County in 2009 had a tornado report inside them.
Mercer County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 10 | 6 | 40% | 11 | 91% | 23 min |
| Flash flood warnings | 16 | 8 | 50% | 7 | 100% | 102 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Blacksburg, VA: tornado warnings | 19 | 1 | 95% | 9 | 11% | 4 min |
| NWS Blacksburg, VA: severe thunderstorm warnings | 264 | 144 | 45% | 348 | 82% | 26 min |
| NWS Blacksburg, VA: flash flood warnings | 108 | 53 | 51% | 135 | 81% | 100 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, 3:30 AM EST | Flood Watch | RNK | 43 hr |
| Jan 7, 4:19 AM EST | Wind Advisory | RNK | 23 hr |
| Jan 7, 4:02 PM EST | Winter Weather Advisory | RNK | 22 hr |
| Jan 15, 4:19 AM EST | Wind Chill Advisory | RNK | 33 hr |
| Jan 17, 11:36 PM EST | Freezing Rain Advisory | RNK | 11 hr |
| Jan 18, 10:52 AM EST | Winter Weather Advisory | RNK | 3 hr |
| Jan 18, 2:53 PM EST | Winter Weather Advisory | RNK | 27 hr |
| Jan 20, 2:00 PM EST | Wind Chill Advisory | RNK | 19 hr |
| Jan 26, 3:20 PM EST | Winter Weather Advisory | RNK | 45 hr |
| Jan 27, 3:48 PM EST | Wind Advisory | RNK | 29 hr |
| Feb 2, 4:11 AM EST | Winter Storm Watch | RNK | 11 hr |
| Feb 2, 3:34 PM EST | Winter Storm Warning | RNK | 62 hr |
| Feb 4, 2:46 PM EST | Wind Chill Advisory | RNK | 19 hr |
| Feb 10, 3:01 PM EST | High Wind Watch | RNK | 14 hr |
| Feb 11, 4:40 AM EST | High Wind Warning | RNK | 35 hr |
| Feb 11, 4:40 AM EST | Wind Advisory | RNK | 43 hr |
| Feb 11, 5:32 PM EST | Mesoscale Discussion | SPC | 88 min |
| Feb 11, 5:47 PM EST | Severe Thunderstorm Warning | RNK | 240 days |
| Feb 11, 5:53 PM EST | Severe Thunderstorm Watch | SPC | 4 hr |
| Feb 11, 6:59 PM EST | Severe Thunderstorm Warning | RNK | 46 min |
| Feb 18, 1:41 PM EST | Winter Weather Advisory | RNK | 43 hr |
| Feb 21, 3:22 PM EST | Winter Weather Advisory | RNK | 40 hr |
| Feb 27, 5:21 AM EST | Wind Advisory | RNK | 7 hr |
| Feb 28, 5:24 AM EST | Winter Storm Watch | RNK | 23 hr |
| Mar 2, 3:32 PM EST | Wind Chill Advisory | RNK | 17 hr |
| Mar 12, 3:59 PM EDT | Winter Weather Advisory | RNK | 19 hr |
| Mar 12, 10:39 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 28, 4:40 PM EDT | Wind Advisory | RNK | 11 hr |
| Apr 3, 3:57 AM EDT | Wind Advisory | RNK | 32 hr |
| Apr 6, 1:39 AM EDT | Special Weather Statement | RNK | 66 min |
| Apr 6, 2:02 AM EDT | Severe Thunderstorm Warning | RNK | 58 min |
| Apr 6, 4:06 AM EDT | Winter Weather Advisory | RNK | 46 hr |
| Apr 10, 11:12 AM EDT | Special Weather Statement | RNK | 63 min |
| Apr 10, 4:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Apr 13, 9:37 AM EDT | Wind Advisory | RNK | 5 hr |
| Apr 29, 4:18 PM EDT | Special Weather Statement | RNK | 27 min |
| May 3, 10:43 PM EDT | Flood Watch | RNK | 13 hr |
| May 5, 3:56 PM EDT | Flood Watch | RNK | 42 hr |
| May 6, 6:35 PM EDT | Special Weather Statement | RNK | 115 min |
| May 8, 3:51 PM EDT | Flood Watch | RNK | 26 hr |
| May 8, 6:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 8, 6:32 PM EDT | Tornado Watch | SPC | 7 hr |
| May 8, 8:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| May 8, 9:31 PM EDT | Flash Flood Warning | RNK | 6 hr |
| May 8, 9:34 PM EDT | Tornado Warning | RNK | 41 min |
| May 8, 11:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| May 9, 3:24 AM EDT | Flash Flood Warning | RNK | 6 hr |
| May 9, 9:11 AM EDT | Areal Flood Warning | RNK | 6 hr |
| May 9, 3:16 PM EDT | Areal Flood Advisory | RNK | 6 hr |
| May 16, 5:35 PM EDT | Special Weather Statement | RNK | 55 min |
| May 18, 3:57 AM EDT | Frost Advisory | RNK | 29 hr |
| May 27, 1:16 PM EDT | Flash Flood Watch | RNK | 11 hr |
| May 27, 4:28 PM EDT | Flash Flood Warning | RNK | 3 hr |
| May 28, 3:42 AM EDT | Flash Flood Watch | RNK | 26 hr |
| May 28, 2:21 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 28, 4:54 PM EDT | Mesoscale Discussion | SPC | 66 min |
| May 28, 5:23 PM EDT | Flash Flood Warning | RNK | 6 hr |
| May 28, 7:34 PM EDT | Mesoscale Discussion | SPC | 56 min |
| May 28, 7:58 PM EDT | Special Weather Statement | RNK | 47 min |
| May 28, 8:26 PM EDT | Flash Flood Warning | RNK | 6 hr |
| May 29, 2:14 AM EDT | Flash Flood Warning | RNK | 4 hr |
| May 30, 5:53 PM EDT | Special Weather Statement | RNK | 67 min |
| May 31, 2:12 AM EDT | Special Weather Statement | RNK | 93 min |
| May 31, 2:23 AM EDT | Severe Thunderstorm Warning | RNK | 82 min |
| May 31, 2:54 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 31, 3:40 AM EDT | Flash Flood Warning | RNK | 3 hr |
| Jun 2, 8:21 PM EDT | Severe Thunderstorm Warning | RNK | 84 min |
| Jun 2, 8:47 PM EDT | Flash Flood Warning | RNK | 6 hr |
| Jun 3, 1:06 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 3, 1:51 PM EDT | Flash Flood Watch | RNK | 15 hr |
| Jun 3, 2:05 PM EDT | Severe Thunderstorm Warning | RNK | 55 min |
| Jun 3, 4:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jun 4, 4:48 AM EDT | Flood Watch | RNK | 31 hr |
| Jun 4, 3:52 PM EDT | Severe Thunderstorm Warning | RNK | 32 min |
| Jun 4, 4:23 PM EDT | Special Weather Statement | RNK | 67 min |
| Jun 4, 5:03 PM EDT | Flash Flood Warning | RNK | 5 hr |
| Jun 11, 9:51 AM EDT | Special Weather Statement | RNK | 54 min |
| Jun 11, 3:47 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 11, 5:59 PM EDT | Severe Thunderstorm Warning | RNK | 61 min |
| Jun 15, 11:44 PM EDT | Flash Flood Watch | RNK | 9 hr |
| Jun 16, 2:58 PM EDT | Flash Flood Watch | RNK | 29 hr |
| Jun 17, 1:53 AM EDT | Special Weather Statement | RNK | 82 min |
| Jun 17, 2:12 AM EDT | Flash Flood Warning | RNK | 6 hr |
| Jun 19, 12:00 PM EDT | Special Weather Statement | RNK | 60 min |
| Jul 1, 3:50 PM EDT | Special Weather Statement | RNK | 55 min |
| Jul 9, 4:07 PM EDT | Special Weather Statement | RNK | 53 min |
| Jul 9, 4:53 PM EDT | Special Weather Statement | RNK | 52 min |
| Jul 9, 5:33 PM EDT | Flash Flood Warning | RNK | 4 hr |
| Jul 16, 6:40 AM EDT | Special Weather Statement | RNK | 65 min |
| Jul 16, 7:33 AM EDT | Flash Flood Warning | RNK | 3 hr |
| Jul 17, 6:09 AM EDT | Special Weather Statement | RNK | 36 min |
| Jul 25, 7:35 PM EDT | Special Weather Statement | RNK | 55 min |
| Jul 25, 8:30 PM EDT | Severe Thunderstorm Warning | RNK | 90 min |
| Jul 26, 9:59 AM EDT | Flash Flood Watch | RNK | 4 hr |
| Jul 31, 10:13 AM EDT | Special Weather Statement | RNK | 62 min |
| Aug 2, 12:40 AM EDT | Flash Flood Watch | RNK | 15 hr |
| Aug 2, 8:19 AM EDT | Special Weather Statement | RNK | 56 min |
| Aug 5, 5:37 AM EDT | Special Weather Statement | RNK | 38 min |
| Aug 5, 5:14 PM EDT | Flash Flood Warning | RNK | 4 hr |
| Aug 5, 5:33 PM EDT | Flash Flood Warning | RNK | 6 hr |
| Aug 10, 2:59 PM EDT | Special Weather Statement | RNK | 61 min |
| Aug 10, 3:32 PM EDT | Special Weather Statement | RNK | 58 min |
| Aug 10, 9:39 PM EDT | Special Weather Statement | RNK | 66 min |
| Aug 11, 1:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Aug 12, 12:47 AM EDT | Special Weather Statement | RNK | 88 min |
| Aug 17, 4:44 PM EDT | Special Weather Statement | RNK | 61 min |
| Aug 18, 7:52 PM EDT | Special Weather Statement | RNK | 38 min |
| Aug 19, 12:12 PM EDT | Special Weather Statement | RNK | 63 min |
| Sep 6, 9:20 PM EDT | Special Weather Statement | RNK | 55 min |
| Sep 8, 9:18 PM EDT | Special Weather Statement | RNK | 27 min |
| Sep 8, 9:36 PM EDT | Flash Flood Warning | RNK | 3 hr |
| Sep 9, 3:14 PM EDT | Special Weather Statement | RNK | 61 min |
| Sep 19, 1:25 AM EDT | Dense Fog Advisory | RNK | 8 hr |
| Sep 25, 3:45 PM EDT | Flash Flood Watch | RNK | 31 hr |
| Sep 26, 3:30 PM EDT | Flash Flood Warning | RNK | 6 hr |
| Sep 28, 11:37 AM EDT | Special Weather Statement | RNK | 38 min |
| Sep 28, 12:10 PM EDT | Special Weather Statement | RNK | 50 min |
| Sep 30, 3:49 AM EDT | Frost Advisory | RNK | 30 hr |
| Oct 6, 9:53 PM EDT | Wind Advisory | RNK | 18 hr |
| Oct 8, 4:03 PM EDT | Wind Advisory | RNK | 27 hr |
| Oct 9, 5:52 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Oct 9, 7:45 PM EDT | Special Weather Statement | RNK | 90 min |
| Oct 16, 5:13 PM EDT | Freeze Warning | RNK | 16 hr |
| Oct 17, 3:48 PM EDT | Freeze Watch | RNK | 19 hr |
| Oct 17, 3:48 PM EDT | Freeze Warning | RNK | 17 hr |
| Oct 18, 10:25 AM EDT | Freeze Warning | RNK | 24 hr |
| Oct 24, 2:10 AM EDT | Special Weather Statement | RNK | 65 min |
| Oct 24, 4:14 AM EDT | Special Weather Statement | RNK | 61 min |
| Nov 11, 9:36 PM EST | Special Weather Statement | RNK | 114 min |
| Nov 17, 9:59 PM EST | Wind Advisory | RNK | 18 hr |
| Nov 26, 4:39 AM EST | Winter Weather Advisory | RNK | 37 hr |
| Dec 1, 4:11 AM EST | High Wind Watch | RNK | 11 hr |
| Dec 1, 2:58 PM EST | High Wind Warning | RNK | 37 hr |
| Dec 4, 3:57 PM EST | Winter Weather Advisory | RNK | 27 hr |
| Dec 8, 5:11 AM EST | High Wind Warning | RNK | 53 hr |
| Dec 8, 5:11 AM EST | Wind Advisory | RNK | 64 hr |
| Dec 9, 2:58 AM EST | Flood Watch | RNK | 5 hr |
| Dec 17, 3:20 PM EST | Winter Storm Warning | RNK | 60 hr |
| Dec 18, 1:32 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 18, 7:22 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 23, 3:37 PM EST | High Wind Watch | RNK | 13 hr |
| Dec 24, 4:04 AM EST | Freezing Rain Advisory | RNK | 35 hr |
| Dec 24, 4:17 AM EST | High Wind Warning | RNK | 36 hr |
| Dec 24, 11:11 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Dec 25, 6:31 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 30, 3:22 PM EST | Winter Weather Advisory | RNK | 21 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.