Alert archive / Virginia / Arlington County

Weather alerts in Arlington County, Virginia, 2019

185 weather alerts in 2019, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Arlington County and its neighbors

Each county as a circle sized by its count in 2019. Tap one for its archive.

Alerts
185
Warnings
45
Watches
36
Advisories
54
Busiest month
July44 alerts
Busiest day
August 20, 20197 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 Arlington County in 2019 had a tornado report inside them.

Arlington County, 2019

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings26248%4100%15 min
Flash flood warnings330%2100%126 min

Each office's whole area, 2019

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Baltimore/Washington: tornado warnings34488%850%5 min
NWS Baltimore/Washington: severe thunderstorm warnings69446833%1,61081%19 min
NWS Baltimore/Washington: flash flood warnings361656%7496%103 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, 2:17 PM ESTWinter Storm WarningLWX56 hr
Jan 11, 2:17 PM ESTWinter Weather AdvisoryLWX56 hr
Jan 13, 6:19 PM ESTSpecial Weather StatementLWX116 min
Jan 13, 9:47 PM ESTWinter Weather AdvisoryLWX20 hr
Jan 17, 3:41 AM ESTWinter Weather AdvisoryLWX30 hr
Jan 19, 1:44 PM ESTWind AdvisoryLWX29 hr
Jan 20, 3:44 AM ESTWind Chill AdvisoryLWX31 hr
Jan 21, 8:55 AM ESTWind AdvisoryLWX4 hr
Jan 23, 4:03 AM ESTFlood WatchLWX35 hr
Jan 23, 12:54 PM ESTWind AdvisoryLWX21 hr
Jan 28, 2:58 PM ESTWinter Weather AdvisoryLWX29 hr
Jan 29, 9:00 PM ESTWind AdvisoryLWX20 hr
Jan 30, 3:33 AM ESTWind Chill AdvisoryLWX30 hr
Jan 31, 3:27 PM ESTWinter Weather AdvisoryLWX27 hr
Feb 7, 8:32 PM ESTDense Fog AdvisoryLWX8 hr
Feb 10, 3:02 AM ESTWinter Weather AdvisoryLWX61 hr
Feb 18, 3:38 AM ESTWinter Storm WatchLWX23 hr
Feb 19, 2:47 AM ESTWinter Storm WarningLWX46 hr
Feb 19, 2:47 AM ESTWinter Weather AdvisoryLWX46 hr
Feb 23, 3:01 PM ESTHigh Wind WarningLWX44 hr
Feb 23, 3:01 PM ESTWind AdvisoryLWX44 hr
Feb 24, 3:02 AM ESTWind AdvisoryLWX38 hr
Feb 28, 9:28 AM ESTWinter Weather AdvisoryLWX24 hr
Mar 19, 10:00 AM EDTSpecial Weather StatementLWX15 min
Mar 20, 8:53 PM EDTFlood WatchLWX26 hr
Mar 21, 2:51 PM EDTCoastal Flood AdvisoryLWX10 hr
Mar 21, 4:01 PM EDTAreal Flood WarningLWX24 hr
Mar 21, 6:29 PM EDTAreal Flood WarningLWX8 hr
Mar 22, 4:54 AM EDTCoastal Flood AdvisoryLWX6 hr
Mar 22, 3:52 PM EDTSevere Thunderstorm WarningLWX38 min
Apr 3, 3:56 AM EDTRed Flag WarningLWX16 hr
Apr 14, 6:08 PM EDTTornado WatchSPC9 hr
Apr 14, 7:42 PM EDTMesoscale DiscussionSPC63 min
Apr 15, 1:18 AM EDTSevere Thunderstorm WarningLWX42 min
Apr 15, 3:51 AM EDTWind AdvisoryLWX16 hr
Apr 18, 2:07 PM EDTFlash Flood WatchLWX32 hr
Apr 19, 12:08 PM EDTMesoscale DiscussionSPC2 hr
Apr 19, 12:48 PM EDTTornado WatchSPC9 hr
Apr 19, 4:32 PM EDTMesoscale DiscussionSPC58 min
Apr 19, 5:28 PM EDTCoastal Flood AdvisoryLWX21 hr
Apr 19, 6:21 PM EDTMesoscale DiscussionSPC84 min
Apr 20, 2:40 PM EDTCoastal Flood AdvisoryLWX9 hr
Apr 26, 11:37 AM EDTMesoscale DiscussionSPC113 min
Apr 26, 1:33 PM EDTTornado WatchSPC6 hr
Apr 26, 2:25 PM EDTSevere Thunderstorm WarningLWX50 min
Apr 26, 5:39 PM EDTWind AdvisoryLWX19 hr
May 2, 4:30 AM EDTDense Fog AdvisoryLWX4 hr
May 2, 3:28 PM EDTMesoscale DiscussionSPC2 hr
May 2, 3:38 PM EDTSevere Thunderstorm WarningLWX52 min
May 4, 4:05 AM EDTFlash Flood WatchLWX30 hr
May 4, 11:10 PM EDTAreal Flood WarningLWX6 hr
May 6, 2:24 PM EDTCoastal Flood AdvisoryLWX19 hr
May 6, 4:34 PM EDTCoastal Flood AdvisoryLWX21 hr
May 13, 10:04 AM EDTCoastal Flood AdvisoryLWX21 hr
May 14, 8:48 AM EDTCoastal Flood AdvisoryLWX21 hr
May 16, 2:16 AM EDTCoastal Flood AdvisoryLWX9 hr
May 23, 1:02 PM EDTSevere Thunderstorm WatchSPC5 hr
May 23, 3:36 PM EDTSevere Thunderstorm WarningLWX39 min
May 23, 3:42 PM EDTMesoscale DiscussionSPC93 min
May 23, 3:47 PM EDTTornado WarningLWX11 min
May 25, 5:43 PM EDTMesoscale DiscussionSPC62 min
May 26, 11:14 AM EDTMesoscale DiscussionSPC3 hr
May 26, 1:45 PM EDTMesoscale DiscussionSPC2 hr
May 26, 5:45 PM EDTMesoscale DiscussionSPC2 hr
May 26, 8:32 PM EDTSevere Thunderstorm WatchSPC4 hr
May 26, 10:26 PM EDTMesoscale DiscussionSPC94 min
May 30, 12:15 PM EDTMesoscale DiscussionSPC2 hr
May 30, 2:01 PM EDTSevere Thunderstorm WatchSPC5 hr
May 30, 3:10 PM EDTSevere Thunderstorm WarningLWX50 min
May 30, 3:56 PM EDTMesoscale DiscussionSPC64 min
Jun 2, 12:53 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 2, 3:33 PM EDTMesoscale DiscussionSPC87 min
Jun 2, 5:21 PM EDTSevere Thunderstorm WarningLWX39 min
Jun 2, 5:57 PM EDTMesoscale DiscussionSPC93 min
Jun 13, 3:51 PM EDTMesoscale DiscussionSPC114 min
Jun 13, 4:47 PM EDTSevere Thunderstorm WarningLWX43 min
Jun 16, 1:53 PM EDTMesoscale DiscussionSPC97 min
Jun 17, 3:57 AM EDTFlash Flood WatchLWX15 hr
Jun 17, 2:03 PM EDTMesoscale DiscussionSPC117 min
Jun 17, 4:05 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 18, 3:38 AM EDTFlash Flood WatchLWX19 hr
Jun 18, 12:23 PM EDTMesoscale DiscussionSPC97 min
Jun 18, 2:11 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 18, 4:47 PM EDTMesoscale DiscussionSPC88 min
Jun 20, 3:37 AM EDTCoastal Flood AdvisoryLWX11 hr
Jun 20, 12:23 PM EDTMesoscale DiscussionSPC2 hr
Jun 24, 7:17 PM EDTMesoscale DiscussionSPC2 hr
Jun 28, 5:59 PM EDTMesoscale DiscussionSPC2 hr
Jun 29, 2:04 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 2, 5:53 PM EDTMesoscale DiscussionSPC2 hr
Jul 2, 7:41 PM EDTSevere Thunderstorm WarningLWX34 min
Jul 4, 11:23 AM EDTFlash Flood WatchLWX12 hr
Jul 4, 12:49 PM EDTMesoscale DiscussionSPC116 min
Jul 6, 1:48 PM EDTMesoscale DiscussionSPC2 hr
Jul 6, 6:45 PM EDTSevere Thunderstorm WarningLWX60 min
Jul 6, 7:35 PM EDTSevere Thunderstorm WarningLWX55 min
Jul 7, 4:06 AM EDTFlash Flood WatchLWX34 hr
Jul 8, 7:46 AM EDTFlash Flood WarningLWX5 hr
Jul 8, 8:20 AM EDTFlash Flood WarningLWX5 hr
Jul 8, 9:21 AM EDTFlash Flood Warning EmergencyLWX114 min
Jul 8, 11:43 AM EDTCoastal Flood AdvisoryLWX16 hr
Jul 8, 12:53 PM EDTAreal Flood WarningLWX5 hr
Jul 11, 4:18 AM EDTFlash Flood WatchLWX15 hr
Jul 11, 12:51 PM EDTMesoscale DiscussionSPC84 min
Jul 11, 5:59 PM EDTMesoscale DiscussionSPC2 hr
Jul 16, 3:28 PM EDTMesoscale DiscussionSPC3 hr
Jul 16, 8:49 PM EDTHeat AdvisoryLWX22 hr
Jul 17, 1:29 PM EDTMesoscale DiscussionSPC3 hr
Jul 17, 4:51 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 17, 5:23 PM EDTSevere Thunderstorm WarningLWX52 min
Jul 17, 5:35 PM EDTSevere Thunderstorm WarningLWX40 min
Jul 17, 8:57 PM EDTExcessive Heat WatchLWX6 hr
Jul 17, 8:57 PM EDTExcessive Heat WatchLWX19 hr
Jul 18, 11:09 AM EDTExcessive Heat WatchLWX28 hr
Jul 18, 11:09 AM EDTExcessive Heat WatchLWX58 hr
Jul 18, 1:49 PM EDTMesoscale DiscussionSPC2 hr
Jul 18, 3:43 PM EDTHeat AdvisoryLWX29 hr
Jul 19, 3:52 AM EDTExcessive Heat WarningLWX17 hr
Jul 19, 3:05 PM EDTExcessive Heat WarningLWX30 hr
Jul 20, 8:49 PM EDTExcessive Heat WarningLWX24 hr
Jul 20, 9:18 PM EDTSevere Thunderstorm WarningLWX30 min
Jul 21, 2:48 PM EDTFlash Flood WatchLWX37 hr
Jul 21, 6:07 PM EDTMesoscale DiscussionSPC83 min
Jul 21, 7:32 PM EDTSevere Thunderstorm WarningLWX43 min
Jul 22, 1:11 PM EDTMesoscale DiscussionSPC94 min
Jul 22, 2:17 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 22, 7:20 PM EDTMesoscale DiscussionSPC55 min
Jul 22, 8:15 PM EDTSevere Thunderstorm WarningLWX30 min
Jul 22, 8:21 PM EDTSevere Thunderstorm WarningLWX24 min
Jul 22, 8:51 PM EDTMesoscale DiscussionSPC84 min
Jul 31, 12:02 PM EDTFlash Flood WatchLWX7 hr
Jul 31, 1:17 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 31, 4:19 PM EDTMesoscale DiscussionSPC56 min
Aug 6, 8:16 PM EDTSevere Thunderstorm WarningLWX22 min
Aug 7, 1:02 PM EDTMesoscale DiscussionSPC88 min
Aug 7, 1:53 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 7, 3:52 PM EDTSevere Thunderstorm WarningLWX38 min
Aug 7, 3:57 PM EDTMesoscale DiscussionSPC93 min
Aug 9, 2:25 PM EDTMesoscale DiscussionSPC95 min
Aug 15, 3:16 PM EDTSevere Thunderstorm WarningLWX44 min
Aug 19, 10:47 PM EDTSevere Thunderstorm WarningLWX43 min
Aug 19, 11:06 PM EDTSevere Thunderstorm WarningLWX15 min
Aug 20, 2:19 PM EDTMesoscale DiscussionSPC56 min
Aug 20, 3:02 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 20, 4:34 PM EDTSevere Thunderstorm WarningLWX41 min
Aug 20, 5:33 PM EDTSevere Thunderstorm WarningLWX27 min
Aug 20, 7:00 PM EDTMesoscale DiscussionSPC2 hr
Aug 21, 3:27 PM EDTSevere Thunderstorm WatchSPC4 hr
Aug 26, 2:20 PM EDTCoastal Flood AdvisoryLWX42 hr
Aug 27, 9:44 AM EDTCoastal Flood AdvisoryLWX23 hr
Sep 6, 3:22 AM EDTCoastal Flood WatchLWX36 hr
Sep 7, 3:15 PM EDTCoastal Flood AdvisoryLWX35 hr
Sep 11, 3:08 PM EDTMesoscale DiscussionSPC2 hr
Sep 11, 4:57 PM EDTSevere Thunderstorm WarningLWX48 min
Sep 12, 2:02 PM EDTMesoscale DiscussionSPC118 min
Sep 13, 10:07 PM EDTCoastal Flood AdvisoryLWX24 hr
Sep 17, 8:34 PM EDTCoastal Flood AdvisoryLWX59 hr
Sep 27, 3:09 PM EDTCoastal Flood AdvisoryLWX32 hr
Sep 28, 5:51 PM EDTMesoscale DiscussionSPC114 min
Sep 30, 11:32 AM EDTCoastal Flood AdvisoryLWX39 hr
Oct 5, 2:12 PM EDTCoastal Flood AdvisoryLWX42 hr
Oct 9, 1:03 PM EDTCoastal Flood AdvisoryLWX5 days
Oct 9, 8:47 PM EDTCoastal Flood WatchLWX3 days
Oct 11, 12:52 AM EDTCoastal Flood WarningLWX64 hr
Oct 16, 3:51 AM EDTWind AdvisoryLWX34 hr
Oct 20, 11:05 PM EDTCoastal Flood AdvisoryLWX4 hr
Oct 21, 6:14 PM EDTCoastal Flood AdvisoryLWX36 hr
Oct 27, 5:25 AM EDTCoastal Flood AdvisoryLWX18 hr
Oct 29, 9:26 AM EDTCoastal Flood AdvisoryLWX15 hr
Oct 29, 8:02 PM EDTCoastal Flood AdvisoryLWX29 hr
Oct 31, 3:48 AM EDTWind AdvisoryLWX24 hr
Oct 31, 1:11 PM EDTMesoscale DiscussionSPC3 hr
Oct 31, 1:58 PM EDTCoastal Flood WarningLWX12 hr
Oct 31, 1:58 PM EDTCoastal Flood AdvisoryLWX15 hr
Oct 31, 2:56 PM EDTTornado WatchSPC10 hr
Oct 31, 4:01 PM EDTMesoscale DiscussionSPC119 min
Oct 31, 7:14 PM EDTMesoscale DiscussionSPC2 hr
Oct 31, 10:07 PM EDTSevere Thunderstorm WarningLWX38 min
Nov 1, 1:00 AM EDTAreal Flood WarningLWX4 hr
Nov 1, 4:07 AM EDTFreeze WatchLWX5 hr
Nov 1, 9:17 AM EDTFreeze WarningLWX24 hr
Nov 18, 2:23 PM ESTCoastal Flood AdvisoryLWX37 hr
Nov 26, 2:47 PM ESTWind AdvisoryLWX45 hr
Dec 13, 4:59 PM ESTDense Fog AdvisoryLWX6 hr
Dec 17, 11:47 AM ESTDense Fog AdvisoryLWX3 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 archive20182020

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.