Alert archive / Virginia / Clarke County

Weather alerts in Clarke County, Virginia, 2008

115 weather alerts in 2008, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Clarke County and its neighbors

Each county as a circle sized by its count in 2008. Tap one for its archive.

Alerts
115
Warnings
29
Watches
28
Advisories
28
Busiest month
June37 alerts
Busiest day
June 4, 20089 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 2 tornado warnings covering Clarke County in 2008 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.

Clarke County, 2008

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings20100%10%
Severe thunderstorm warnings191142%4100%10 min
Flash flood warnings00

Each office's whole area, 2008

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Baltimore/Washington: tornado warnings36878%2143%18 min
NWS Baltimore/Washington: severe thunderstorm warnings39122044%57976%21 min
NWS Baltimore/Washington: flash flood warnings231152%5375%117 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 16, 2:35 PM ESTWinter Weather AdvisoryLWX36 hr
Jan 16, 9:28 PM ESTWinter Storm WarningLWX24 hr
Jan 17, 7:51 AM ESTMesoscale DiscussionSPC4 hr
Jan 17, 12:53 PM ESTMesoscale DiscussionSPC4 hr
Jan 21, 3:04 PM ESTWinter Weather AdvisoryLWX22 hr
Jan 29, 3:18 PM ESTWind AdvisoryLWX20 hr
Jan 30, 2:58 PM ESTWinter Storm WatchLWX24 hr
Jan 31, 3:03 PM ESTWinter Storm WarningLWX21 hr
Feb 1, 7:36 AM ESTMesoscale DiscussionSPC5 hr
Feb 6, 4:49 AM ESTMesoscale DiscussionSPC86 min
Feb 9, 2:30 PM ESTHigh Wind WarningLWX29 hr
Feb 9, 2:30 PM ESTWind AdvisoryLWX32 hr
Feb 10, 4:00 AM ESTRed Flag WarningLWX18 hr
Feb 11, 8:58 PM ESTWinter Weather AdvisoryLWX40 hr
Feb 12, 4:15 PM ESTMesoscale DiscussionSPC6 hr
Feb 13, 1:31 AM ESTMesoscale DiscussionSPC6 hr
Feb 19, 9:51 PM ESTSnow AdvisoryLWX24 hr
Feb 20, 10:07 PM ESTWinter Storm WatchLWX17 hr
Feb 21, 2:38 PM ESTWinter Storm WarningLWX22 hr
Feb 21, 2:38 PM ESTWinter Weather AdvisoryLWX42 hr
Feb 22, 7:01 AM ESTMesoscale DiscussionSPC6 hr
Feb 25, 9:20 PM ESTWinter Weather AdvisoryLWX12 hr
Mar 3, 3:44 PM ESTFlood WatchLWX36 hr
Mar 7, 3:42 PM ESTWind AdvisoryLWX35 hr
Mar 8, 3:06 AM ESTHigh Wind WarningLWX19 hr
Mar 19, 8:46 PM EDTWind AdvisoryLWX19 hr
Apr 20, 3:12 AM EDTFlood WatchLWX27 hr
Apr 26, 6:11 AM EDTDense Fog AdvisoryLWX4 hr
Apr 29, 2:23 PM EDTFrost AdvisoryLWX18 hr
May 8, 3:19 PM EDTFlood WatchLWX17 hr
May 10, 3:49 PM EDTFlood WatchLWX46 hr
May 12, 12:14 AM EDTAreal Flood WarningLWX12 hr
May 31, 8:54 AM EDTMesoscale DiscussionSPC96 min
May 31, 10:14 AM EDTSevere Thunderstorm WarningLWX44 min
May 31, 10:20 AM EDTTornado WatchSPC7 hr
May 31, 10:25 AM EDTTornado WatchSPC7 hr
May 31, 12:56 PM EDTSevere Thunderstorm WarningLWX40 min
Jun 4, 1:14 AM EDTFlash Flood WatchLWX8 hr
Jun 4, 11:51 AM EDTMesoscale DiscussionSPC84 min
Jun 4, 12:49 PM EDTTornado WatchSPC7 hr
Jun 4, 1:59 PM EDTSevere Thunderstorm WarningLWX61 min
Jun 4, 2:15 PM EDTTornado WarningLWX29 min
Jun 4, 2:23 PM EDTSevere Thunderstorm WarningLWX58 min
Jun 4, 2:27 PM EDTTornado WarningLWX29 min
Jun 4, 4:04 PM EDTMesoscale DiscussionSPC116 min
Jun 4, 7:13 PM EDTMesoscale DiscussionSPC62 min
Jun 6, 4:17 AM EDTExcessive Heat WatchLWX48 hr
Jun 6, 3:19 PM EDTHeat AdvisoryLWX29 hr
Jun 7, 8:08 PM EDTHeat AdvisoryLWX71 hr
Jun 10, 2:27 PM EDTMesoscale DiscussionSPC63 min
Jun 10, 2:54 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 10, 3:44 PM EDTSevere Thunderstorm WarningLWX46 min
Jun 14, 12:10 PM EDTMesoscale DiscussionSPC95 min
Jun 14, 1:51 PM EDTSevere Thunderstorm WarningLWX54 min
Jun 16, 12:54 PM EDTMesoscale DiscussionSPC2 hr
Jun 16, 1:21 PM EDTSevere Thunderstorm WatchSPC10 hr
Jun 16, 3:24 PM EDTSevere Thunderstorm WarningLWX41 min
Jun 16, 6:55 PM EDTMesoscale DiscussionSPC95 min
Jun 22, 12:16 PM EDTMesoscale DiscussionSPC89 min
Jun 22, 1:15 PM EDTSevere Thunderstorm WatchSPC11 hr
Jun 22, 4:28 PM EDTMesoscale DiscussionSPC92 min
Jun 23, 5:00 PM EDTSevere Thunderstorm WatchSPC5 hr
Jun 23, 7:52 PM EDTSevere Thunderstorm WarningLWX38 min
Jun 23, 8:20 PM EDTSevere Thunderstorm WarningLWX55 min
Jun 23, 8:30 PM EDTMesoscale DiscussionSPC60 min
Jun 27, 11:37 AM EDTMesoscale DiscussionSPC2 hr
Jun 28, 6:31 PM EDTSevere Thunderstorm WatchSPC5 hr
Jun 28, 7:12 PM EDTSevere Thunderstorm WarningLWX63 min
Jun 29, 2:04 PM EDTMesoscale DiscussionSPC116 min
Jun 29, 4:37 PM EDTSevere Thunderstorm WatchSPC9 hr
Jun 29, 9:30 PM EDTMesoscale DiscussionSPC2 hr
Jun 29, 10:30 PM EDTSevere Thunderstorm WarningLWX63 min
Jun 29, 10:58 PM EDTSevere Thunderstorm WarningLWX77 min
Jun 30, 7:52 PM EDTMesoscale DiscussionSPC113 min
Jul 4, 3:48 PM EDTMesoscale DiscussionSPC117 min
Jul 13, 1:03 PM EDTMesoscale DiscussionSPC87 min
Jul 20, 6:57 PM EDTSevere Thunderstorm WarningLWX37 min
Jul 20, 7:19 PM EDTSevere Thunderstorm WarningLWX41 min
Jul 23, 12:52 AM EDTSevere Thunderstorm WarningLWX53 min
Jul 23, 3:25 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 26, 7:12 PM EDTSevere Thunderstorm WarningLWX48 min
Jul 27, 11:03 AM EDTMesoscale DiscussionSPC57 min
Jul 27, 12:10 PM EDTSevere Thunderstorm WarningLWX32 min
Aug 2, 1:18 PM EDTMesoscale DiscussionSPC57 min
Aug 2, 1:56 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 2, 7:09 PM EDTMesoscale DiscussionSPC96 min
Aug 10, 1:36 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 10, 2:56 PM EDTSevere Thunderstorm WarningLWX30 min
Aug 10, 3:13 PM EDTSevere Thunderstorm WarningLWX34 min
Aug 10, 4:06 PM EDTMesoscale DiscussionSPC84 min
Aug 14, 4:27 PM EDTSevere Thunderstorm WatchSPC5 hr
Sep 4, 5:26 PM EDTFlash Flood WatchLWX47 hr
Sep 6, 4:22 AM EDTMesoscale DiscussionSPC3 hr
Sep 24, 11:47 AM EDTHigh Wind WatchLWX17 hr
Sep 30, 7:13 AM EDTDense Fog AdvisoryLWX3 hr
Oct 17, 3:33 AM EDTFreeze WatchLWX36 hr
Oct 18, 3:25 AM EDTFreeze WatchLWX24 hr
Oct 19, 3:39 AM EDTFreeze WarningLWX29 hr
Oct 20, 1:52 PM EDTFire Weather WatchLWX20 hr
Oct 28, 4:24 AM EDTWind AdvisoryLWX30 hr
Nov 13, 7:06 PM ESTDense Fog AdvisoryLWX15 hr
Nov 29, 3:47 PM ESTWinter Weather AdvisoryLWX27 hr
Dec 7, 10:05 AM ESTWind AdvisoryLWX7 hr
Dec 10, 3:46 PM ESTWinter Weather AdvisoryLWX42 hr
Dec 10, 9:56 PM ESTFlood WatchLWX24 hr
Dec 15, 3:59 PM ESTWinter Storm WatchLWX13 hr
Dec 16, 4:32 AM ESTWinter Weather AdvisoryLWX30 hr
Dec 19, 4:29 AM ESTDense Fog AdvisoryLWX5 hr
Dec 20, 12:00 AM ESTDense Fog AdvisoryLWX5 hr
Dec 20, 3:17 PM ESTWinter Weather AdvisoryLWX18 hr
Dec 20, 11:55 PM ESTMesoscale DiscussionSPC4 hr
Dec 21, 3:17 PM ESTWind Chill AdvisoryLWX21 hr
Dec 21, 3:21 PM ESTWind AdvisoryLWX21 hr
Dec 23, 3:40 PM ESTWinter Weather AdvisoryLWX18 hr
Dec 30, 2:58 PM ESTWind AdvisoryLWX31 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 archive20072009

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.