Alert archive / West Virginia / Flash Flood Warnings
Flash Flood Warnings in West Virginia, 2009
45 flash flood warnings in 2009. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Flash Flood Warnings
- 45
- Busiest month
- May13 flash flood warnings
- Busiest day
- May 29, 20094 flash flood warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
19 of 45 flash flood warnings covering West Virginia in 2009 had a flash flood report inside them; 27 of 29 flash flood reports fell inside a warning, on average 94 minutes after it went out.
West Virginia, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 45 | 19 | 58% | 29 | 93% | 94 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Blacksburg, VA: flash flood warnings | 108 | 53 | 51% | 135 | 81% | 100 min |
| NWS Pittsburgh, PA: flash flood warnings | 9 | 6 | 33% | 11 | 91% | 72 min |
| NWS Charleston, WV: flash flood warnings | 30 | 10 | 67% | 24 | 92% | 77 min |
| NWS Baltimore/Washington: flash flood warnings | 43 | 18 | 58% | 56 | 80% | 56 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 | Counties | Lasted |
|---|---|---|---|---|
| May 8, 9:31 PM EDT | Flash Flood Warning | RNK | Mercer, Monroe, Summers | 6 hr |
| May 9, 3:24 AM EDT | Flash Flood Warning | RNK | Mercer, Monroe, Summers | 6 hr |
| May 15, 8:52 PM EDT | Flash Flood Warning | RNK | Greenbrier | 106 min |
| May 23, 5:48 PM EDT | Flash Flood Warning | LWX | Mineral | 2 hr |
| May 24, 8:47 PM EDT | Flash Flood Warning | RLX | Calhoun | 70 min |
| May 27, 4:28 PM EDT | Flash Flood Warning | RNK | Mercer | 3 hr |
| May 27, 6:24 PM EDT | Flash Flood Warning | RLX | Boone, Kanawha | 111 min |
| May 28, 5:23 PM EDT | Flash Flood Warning | RNK | Mercer | 6 hr |
| May 28, 8:26 PM EDT | Flash Flood Warning | RNK | Mercer | 6 hr |
| May 28, 9:10 PM EDT | Flash Flood Warning | RLX | Mingo | 3 hr |
| May 28, 11:55 PM EDT | Flash Flood Warning | RLX | Mingo | 80 min |
| May 29, 2:14 AM EDT | Flash Flood Warning | RNK | Mercer | 4 hr |
| May 31, 3:40 AM EDT | Flash Flood Warning | RNK | Mercer | 3 hr |
| Jun 2, 6:12 PM EDT | Flash Flood Warning | RLX | Mingo | 2 hr |
| Jun 2, 8:47 PM EDT | Flash Flood Warning | RNK | Mercer | 6 hr |
| Jun 2, 10:37 PM EDT | Flash Flood Warning | RNK | Greenbrier | 4 hr |
| Jun 4, 5:03 PM EDT | Flash Flood Warning | RNK | Mercer | 5 hr |
| Jun 11, 5:24 PM EDT | Flash Flood Warning | RLX | Logan, McDowell, Mingo, Wyoming | 114 min |
| Jun 17, 2:12 AM EDT | Flash Flood Warning | RNK | Mercer | 6 hr |
| Jun 17, 7:30 PM EDT | Flash Flood Warning | PBZ | Hancock | 3 hr |
| Jun 17, 9:17 PM EDT | Flash Flood Warning | PBZ | Brooke, Ohio | 3 hr |
| Jun 17, 10:46 PM EDT | Flash Flood Warning | PBZ | Marshall, Ohio | 3 hr |
| Jun 18, 12:12 AM EDT | Flash Flood Warning | LWX | Mineral | 3 hr |
| Jun 18, 12:42 AM EDT | Flash Flood Warning | LWX | Hampshire | 3 hr |
| Jul 9, 5:33 PM EDT | Flash Flood Warning | RNK | Mercer | 4 hr |
| Jul 9, 6:19 PM EDT | Flash Flood Warning | RLX | McDowell, Mingo | 86 min |
| Jul 16, 7:33 AM EDT | Flash Flood Warning | RNK | Mercer | 3 hr |
| Jul 17, 9:55 AM EDT | Flash Flood Warning | RLX | Upshur, Webster | 113 min |
| Jul 20, 8:46 PM EDT | Flash Flood Warning | RLX | Nicholas | 119 min |
| Jul 20, 9:59 PM EDT | Flash Flood Warning | RLX | Fayette | 2 hr |
| Jul 31, 12:40 AM EDT | Flash Flood Warning | RLX | Kanawha, Lincoln, Putnam | 2 hr |
| Aug 2, 2:52 AM EDT | Flash Flood Warning | RLX | Boone, Clay, Kanawha, Lincoln | 3 hr |
| Aug 2, 3:36 AM EDT | Flash Flood Warning | RLX | Cabell, Wayne | 3 hr |
| Aug 2, 3:47 AM EDT | Flash Flood Warning | RLX | Barbour, Braxton, Lewis, Nicholas, Randolph, Upshur and 1 more | 4 hr |
| Aug 5, 5:14 PM EDT | Flash Flood Warning | RNK | Mercer, Monroe | 4 hr |
| Aug 5, 5:33 PM EDT | Flash Flood Warning | RNK | Mercer | 6 hr |
| Aug 5, 6:02 PM EDT | Flash Flood Warning | RNK | Monroe | 3 hr |
| Aug 10, 5:58 PM EDT | Flash Flood Warning | RLX | Cabell, Mason, Putnam | 4 hr |
| Aug 12, 5:52 PM EDT | Flash Flood Warning | RLX | Wayne | 3 hr |
| Aug 19, 2:49 PM EDT | Flash Flood Warning | RLX | McDowell | 3 hr |
| Aug 19, 7:10 PM EDT | Flash Flood Warning | LWX | Morgan | 3 hr |
| Aug 29, 1:50 AM EDT | Flash Flood Warning | RLX | Clay | 3 hr |
| Sep 6, 3:46 PM EDT | Flash Flood Warning | RLX | Upshur | 103 min |
| Sep 8, 9:36 PM EDT | Flash Flood Warning | RNK | Mercer | 3 hr |
| Sep 26, 3:30 PM EDT | Flash Flood Warning | RNK | Mercer | 6 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Mercer County16
- Mingo County5
- Monroe County4
- Kanawha County3
- McDowell County3
- Upshur County3
- Summers County2
- Greenbrier County2
- Mineral County2
- Boone County2
- Ohio County2
- Webster County2
- Nicholas County2
- Lincoln County2
- Putnam County2
- Clay County2
- Cabell County2
- Wayne County2
- Calhoun County1
- Logan County1
- Wyoming County1
- Hancock County1
- Brooke County1
- Marshall County1
- Hampshire County1
- Fayette County1
- Barbour County1
- Braxton County1
- Lewis County1
- Randolph County1
- Mason County1
- Morgan County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe 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.