Alert archive / West Virginia / Grant County

Weather alerts in Grant County, West Virginia, 2009

117 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Grant County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts
117
Warnings
16
Watches
25
Advisories
57
Busiest month
February23 alerts
Busiest day
February 11, 20095 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

Grant County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings4250%2100%41 min
Flash flood warnings00

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Baltimore/Washington: tornado warnings13192%813%2 min
NWS Baltimore/Washington: severe thunderstorm warnings21611348%27786%21 min
NWS Baltimore/Washington: flash flood warnings431858%5680%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.

IssuedProductOfficeLasted
Jan 5, 4:09 AM ESTWinter Storm WatchLWX11 hr
Jan 5, 2:57 PM ESTWinter Weather AdvisoryLWX45 hr
Jan 7, 2:55 PM ESTWinter Weather AdvisoryLWX38 hr
Jan 7, 3:01 PM ESTWind AdvisoryLWX13 hr
Jan 10, 1:17 PM ESTWinter Weather AdvisoryLWX15 hr
Jan 10, 9:18 PM ESTWinter Weather AdvisoryLWX7 hr
Jan 11, 7:40 PM ESTWinter Weather AdvisoryLWX14 hr
Jan 13, 10:42 AM ESTWinter Weather AdvisoryLWX17 hr
Jan 14, 11:06 AM ESTWinter Weather AdvisoryLWX28 hr
Jan 14, 2:54 PM ESTWind Chill AdvisoryLWX67 hr
Jan 18, 11:07 AM ESTWinter Weather AdvisoryLWX33 hr
Jan 20, 2:45 PM ESTWind Chill AdvisoryLWX18 hr
Jan 26, 3:54 AM ESTWinter Storm WatchLWX24 hr
Jan 26, 3:07 PM ESTWinter Weather AdvisoryLWX45 hr
Jan 27, 3:45 AM ESTWinter Storm WarningLWX36 hr
Jan 30, 3:46 AM ESTWinter Weather AdvisoryLWX14 hr
Feb 2, 10:49 AM ESTWinter Weather AdvisoryLWX17 hr
Feb 2, 3:12 PM ESTWinter Storm WatchLWX13 hr
Feb 3, 4:11 AM ESTWinter Weather AdvisoryLWX30 hr
Feb 4, 12:35 AM ESTWinter Weather AdvisoryLWX27 hr
Feb 4, 3:05 PM ESTWind Chill AdvisoryLWX18 hr
Feb 10, 3:52 PM ESTHigh Wind WatchLWX24 hr
Feb 11, 3:40 PM ESTHigh Wind WarningLWX28 hr
Feb 11, 3:40 PM ESTWind AdvisoryLWX32 hr
Feb 11, 3:42 PM ESTWinter Weather AdvisoryLWX19 hr
Feb 11, 5:32 PM ESTMesoscale DiscussionSPC88 min
Feb 11, 5:53 PM ESTSevere Thunderstorm WatchSPC4 hr
Feb 11, 7:22 PM ESTSevere Thunderstorm WarningLWX53 min
Feb 11, 8:00 PM ESTMesoscale DiscussionSPC60 min
Feb 11, 8:17 PM ESTSevere Thunderstorm WarningLWX58 min
Feb 16, 12:10 PM ESTWinter Weather AdvisoryLWX10 hr
Feb 17, 10:15 PM ESTWinter Weather AdvisoryLWX14 hr
Feb 18, 1:05 AM ESTMesoscale DiscussionSPC4 hr
Feb 18, 2:55 PM ESTWinter Storm WarningLWX44 hr
Feb 18, 2:56 PM ESTWind AdvisoryLWX37 hr
Feb 19, 9:17 PM ESTWind Chill AdvisoryLWX12 hr
Feb 21, 2:47 AM ESTWinter Storm WatchLWX13 hr
Feb 21, 3:26 PM ESTWinter Weather AdvisoryLWX48 hr
Feb 22, 3:21 PM ESTWinter Storm WarningLWX24 hr
Mar 2, 3:03 PM ESTWind Chill AdvisoryLWX18 hr
Mar 8, 3:04 PM EDTWind AdvisoryLWX23 hr
Mar 29, 2:31 PM EDTWind AdvisoryLWX20 hr
Apr 3, 4:32 AM EDTWind AdvisoryLWX34 hr
Apr 6, 2:47 PM EDTWinter Weather AdvisoryLWX40 hr
Apr 21, 6:30 AM EDTDense Fog AdvisoryLWX3 hr
Apr 21, 2:12 PM EDTMesoscale DiscussionSPC2 hr
May 4, 8:51 AM EDTFlood WatchLWX4 hr
May 5, 3:23 PM EDTFlood WatchLWX37 hr
May 8, 5:35 PM EDTFlash Flood WatchLWX7 hr
May 12, 3:08 PM EDTFrost AdvisoryLWX17 hr
May 15, 3:12 AM EDTDense Fog AdvisoryLWX6 hr
May 16, 12:05 PM EDTMesoscale DiscussionSPC55 min
May 16, 3:27 PM EDTFreeze WatchLWX12 hr
May 17, 3:18 AM EDTFrost AdvisoryLWX30 hr
May 17, 3:18 AM EDTFreeze WarningLWX18 hr
May 18, 3:53 AM EDTFreeze WarningLWX28 hr
May 19, 3:04 PM EDTFrost AdvisoryLWX17 hr
May 28, 4:55 PM EDTFlash Flood WatchLWX7 hr
Jun 3, 1:06 PM EDTSevere Thunderstorm WatchSPC9 hr
Jun 3, 7:10 PM EDTMesoscale DiscussionSPC95 min
Jun 4, 4:28 AM EDTFlood WatchLWX38 hr
Jun 9, 1:18 PM EDTFlash Flood WatchLWX7 hr
Jun 9, 1:38 PM EDTMesoscale DiscussionSPC97 min
Jun 9, 2:07 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 9, 3:47 PM EDTSevere Thunderstorm WarningLWX43 min
Jun 9, 4:03 PM EDTMesoscale DiscussionSPC57 min
Jun 10, 1:57 PM EDTMesoscale DiscussionSPC93 min
Jun 11, 3:58 AM EDTFlash Flood WatchLWX24 hr
Jun 11, 11:51 AM EDTMesoscale DiscussionSPC84 min
Jun 17, 9:23 PM EDTFlash Flood WatchLWX7 hr
Jun 17, 9:31 PM EDTMesoscale DiscussionSPC59 min
Jun 17, 9:56 PM EDTSevere Thunderstorm WatchSPC3 hr
Jun 19, 5:56 PM EDTMesoscale DiscussionSPC64 min
Jun 19, 6:28 PM EDTSevere Thunderstorm WatchSPC3 hr
Jun 26, 2:42 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 6, 5:10 AM EDTDense Fog AdvisoryLWX4 hr
Jul 21, 1:56 PM EDTMesoscale DiscussionSPC64 min
Jul 21, 2:39 PM EDTSevere Thunderstorm WarningLWX51 min
Jul 25, 3:05 PM EDTMesoscale DiscussionSPC55 min
Aug 12, 12:36 PM EDTMesoscale DiscussionSPC84 min
Sep 30, 3:45 AM EDTFrost AdvisoryLWX29 hr
Oct 5, 3:13 PM EDTFrost AdvisoryLWX18 hr
Oct 6, 10:03 PM EDTWind AdvisoryLWX20 hr
Oct 11, 2:47 PM EDTFrost AdvisoryLWX17 hr
Oct 13, 4:10 AM EDTFrost AdvisoryLWX28 hr
Oct 15, 3:31 PM EDTWinter Weather AdvisoryLWX18 hr
Oct 17, 9:41 PM EDTFreeze WarningLWX11 hr
Oct 18, 3:41 AM EDTFreeze WatchLWX11 hr
Oct 18, 2:58 PM EDTFreeze WarningLWX18 hr
Oct 24, 5:25 AM EDTMesoscale DiscussionSPC95 min
Nov 14, 9:06 PM ESTDense Fog AdvisoryLWX12 hr
Nov 25, 3:17 PM ESTWinter Storm WatchLWX24 hr
Nov 25, 7:20 PM ESTDense Fog AdvisoryLWX17 hr
Nov 26, 2:49 PM ESTWinter Weather AdvisoryLWX30 hr
Dec 2, 4:00 AM ESTWind AdvisoryLWX18 hr
Dec 4, 2:17 PM ESTWinter Weather AdvisoryLWX30 hr
Dec 4, 11:07 PM ESTWinter Storm WarningLWX18 hr
Dec 7, 2:16 PM ESTWinter Storm WatchLWX24 hr
Dec 8, 9:50 AM ESTWinter Storm WarningLWX21 hr
Dec 8, 1:14 PM ESTMesoscale DiscussionSPC5 hr
Dec 9, 4:02 AM ESTWind AdvisoryLWX17 hr
Dec 9, 2:07 PM ESTHigh Wind WarningLWX5 hr
Dec 10, 3:47 AM ESTWind AdvisoryLWX7 hr
Dec 10, 3:00 PM ESTWind Chill AdvisoryLWX18 hr
Dec 12, 3:21 PM ESTWinter Weather AdvisoryLWX23 hr
Dec 17, 1:48 PM ESTWinter Storm WatchLWX14 hr
Dec 18, 4:05 AM ESTWinter Storm WarningLWX47 hr
Dec 19, 12:34 AM ESTMesoscale DiscussionSPC5 hr
Dec 19, 6:57 AM ESTMesoscale DiscussionSPC6 hr
Dec 23, 2:46 PM ESTWinter Storm WatchLWX24 hr
Dec 24, 2:29 PM ESTWinter Weather AdvisoryLWX31 hr
Dec 25, 4:32 AM ESTWind AdvisoryLWX13 hr
Dec 25, 4:14 PM ESTDense Fog AdvisoryLWX4 hr
Dec 27, 1:12 AM ESTDense Fog AdvisoryLWX8 hr
Dec 27, 3:16 PM ESTWinter Weather AdvisoryLWX39 hr
Dec 28, 2:48 PM ESTWind AdvisoryLWX23 hr
Dec 30, 1:58 PM ESTWinter Weather AdvisoryLWX21 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.