Alert archive / West Virginia / Mercer County

Weather alerts in Mercer County, West Virginia, 2021

89 weather alerts in 2021, 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 2021. Tap one for its archive.

Alerts
89
Warnings
13
Watches
14
Advisories
31
Busiest month
August19 alerts
Busiest day
June 9, 20214 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, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings3233%30%
Flash flood warnings10100%20%

Each office's whole area, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Blacksburg, VA: tornado warnings30197%250%1 min
NWS Blacksburg, VA: severe thunderstorm warnings22116525%52274%20 min
NWS Blacksburg, VA: flash flood warnings421467%5161%107 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 11, 9:38 AM ESTSpecial Weather StatementRNK22 min
Jan 15, 3:24 PM ESTWinter Weather AdvisoryRNK40 hr
Jan 26, 12:15 AM ESTAreal Flood WarningRNK12 hr
Jan 26, 12:25 PM ESTAreal Flood AdvisoryRNK4 hr
Jan 27, 4:32 AM ESTWinter Storm WarningRNK31 hr
Jan 27, 4:32 AM ESTWinter Weather AdvisoryRNK31 hr
Jan 29, 3:12 PM ESTWinter Storm WatchRNK14 hr
Jan 30, 5:19 AM ESTWinter Storm WarningRNK33 hr
Jan 31, 5:12 AM ESTMesoscale DiscussionSPC6 hr
Jan 31, 2:14 PM ESTWinter Weather AdvisoryRNK47 hr
Feb 1, 2:27 PM ESTWind AdvisoryRNK47 hr
Feb 5, 11:53 AM ESTWinter Storm WatchRNK16 hr
Feb 6, 4:16 AM ESTWinter Storm WarningRNK32 hr
Feb 7, 4:24 AM ESTMesoscale DiscussionSPC6 hr
Feb 10, 3:40 AM ESTWinter Storm WatchRNK24 hr
Feb 11, 4:05 AM ESTWinter Weather AdvisoryRNK31 hr
Feb 12, 3:47 AM ESTWinter Weather AdvisoryRNK56 hr
Feb 12, 10:42 AM ESTFreezing Fog AdvisoryRNK10 hr
Feb 14, 3:07 PM ESTFreezing Fog AdvisoryRNK19 hr
Feb 16, 5:07 AM ESTWinter Storm WatchRNK23 hr
Feb 17, 4:25 AM ESTWinter Storm WarningRNK47 hr
Feb 18, 11:51 AM ESTWinter Weather AdvisoryRNK22 hr
Feb 25, 8:06 PM ESTWinter Weather AdvisoryRNK30 hr
Feb 27, 1:39 AM ESTFreezing Fog AdvisoryRNK5 hr
Feb 27, 4:46 AM ESTFlood WatchRNK50 hr
Feb 27, 8:30 AM ESTAreal Flood AdvisoryRNK6 hr
Feb 28, 12:28 AM ESTDense Fog AdvisoryRNK9 hr
Feb 28, 8:27 PM ESTSpecial Weather StatementRNK63 min
Mar 1, 7:43 AM ESTAreal Flood WarningRNK25 hr
Mar 2, 9:34 AM ESTAreal Flood WarningRNK116 min
Mar 18, 2:25 PM EDTMesoscale DiscussionSPC3 hr
Mar 18, 7:10 PM EDTSevere Thunderstorm WarningRNK65 min
Mar 18, 8:01 PM EDTSevere Thunderstorm WarningRNK59 min
Mar 25, 4:45 AM EDTWind AdvisoryRNK33 hr
Mar 28, 10:05 AM EDTAreal Flood AdvisoryRNK4 hr
Mar 28, 2:12 PM EDTSpecial Weather StatementRNK63 min
Mar 30, 2:22 PM EDTFlash Flood WatchRNK24 hr
Mar 31, 2:13 PM EDTWind AdvisoryRNK33 hr
Apr 20, 3:23 AM EDTFreeze WatchRNK24 hr
Apr 21, 3:39 AM EDTFreeze WarningRNK29 hr
Apr 21, 9:48 PM EDTFreeze WatchRNK6 hr
Apr 22, 3:27 AM EDTFreeze WarningRNK30 hr
Apr 29, 2:47 PM EDTWind AdvisoryRNK33 hr
May 4, 1:04 PM EDTMesoscale DiscussionSPC56 min
May 4, 1:30 PM EDTSpecial Weather StatementRNK30 min
May 12, 12:37 PM EDTFrost AdvisoryRNK20 hr
Jun 7, 6:34 PM EDTAreal Flood AdvisoryRNK4 hr
Jun 7, 6:49 PM EDTSpecial Weather StatementRLX26 min
Jun 8, 8:26 PM EDTAreal Flood AdvisoryRNK111 min
Jun 9, 3:54 PM EDTSpecial Weather StatementRNK36 min
Jun 9, 4:37 PM EDTSpecial Weather StatementRNK23 min
Jun 9, 5:13 PM EDTAreal Flood AdvisoryRNK3 hr
Jun 10, 1:14 PM EDTFlash Flood WatchRNK33 hr
Jun 13, 4:31 PM EDTMesoscale DiscussionSPC89 min
Jun 13, 4:56 PM EDTSevere Thunderstorm WatchSPC5 hr
Jun 13, 7:05 PM EDTMesoscale DiscussionSPC85 min
Jun 13, 8:17 PM EDTSevere Thunderstorm WarningRNK58 min
Jul 1, 10:00 AM EDTFlash Flood WatchRNK21 hr
Jul 8, 2:32 PM EDTSpecial Weather StatementRNK43 min
Jul 8, 2:59 PM EDTAreal Flood AdvisoryRNK2 hr
Jul 10, 2:32 PM EDTMesoscale DiscussionSPC118 min
Jul 10, 2:52 PM EDTSpecial Weather StatementRNK38 min
Jul 10, 3:32 PM EDTSpecial Weather StatementRNK43 min
Jul 17, 3:27 PM EDTSpecial Weather StatementRNK48 min
Jul 17, 4:17 PM EDTSpecial Weather StatementRNK43 min
Jul 17, 5:01 PM EDTSpecial Weather StatementRNK59 min
Jul 17, 10:29 PM EDTSpecial Weather StatementRNK31 min
Jul 27, 3:15 AM EDTDense Fog AdvisoryRNK6 hr
Aug 4, 10:10 PM EDTSpecial Weather StatementRNK50 min
Aug 4, 10:39 PM EDTFlash Flood WarningRNK4 hr
Aug 7, 4:14 PM EDTSpecial Weather StatementRNK46 min
Aug 13, 5:20 PM EDTSpecial Weather StatementRNK40 min
Aug 13, 6:02 PM EDTSpecial Weather StatementRNK43 min
Aug 13, 7:14 PM EDTSpecial Weather StatementRNK46 min
Aug 13, 8:08 PM EDTSpecial Weather StatementRNK52 min
Aug 13, 8:52 PM EDTSpecial Weather StatementRNK38 min
Aug 15, 4:52 PM EDTSpecial Weather StatementRNK38 min
Aug 16, 8:45 PM EDTAreal Flood AdvisoryRNK2 hr
Aug 17, 3:37 AM EDTFlash Flood WatchRNK24 hr
Aug 17, 2:53 PM EDTFlood WatchRNK12 min
Aug 17, 11:26 PM EDTAreal Flood AdvisoryRNK5 hr
Aug 25, 4:23 PM EDTAreal Flood AdvisoryRNK3 hr
Aug 27, 3:53 AM EDTDense Fog AdvisoryRNK6 hr
Aug 30, 5:04 AM EDTFlash Flood WatchRNK60 hr
Aug 30, 9:06 AM EDTSpecial Weather StatementRNK39 min
Aug 31, 2:59 PM EDTWind AdvisoryRNK15 hr
Aug 31, 6:57 PM EDTMesoscale DiscussionSPC93 min
Oct 28, 7:56 PM EDTWind AdvisoryRNK12 hr
Dec 25, 3:36 AM ESTWind AdvisoryRNK21 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 archive20202022

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.