Alert archive / Maryland / Calvert County

Weather alerts in Calvert County, Maryland, 2019

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

Calvert County and its neighbors

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

Alerts
157
Warnings
50
Watches
28
Advisories
40
Busiest month
July32 alerts
Busiest day
May 23, 20196 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 Calvert County in 2019 had a tornado report inside them.

Calvert County, 2019

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings402538%4195%23 min
Flash flood warnings00

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 13, 3:54 AM ESTMesoscale DiscussionSPC4 hr
Jan 13, 6:19 PM ESTSpecial Weather StatementLWX116 min
Jan 13, 9:47 PM ESTWinter Weather AdvisoryLWX20 hr
Jan 19, 1:44 PM ESTWind AdvisoryLWX29 hr
Jan 19, 9:43 PM ESTCoastal Flood AdvisoryLWX18 hr
Jan 20, 3:44 AM ESTWind Chill AdvisoryLWX31 hr
Jan 21, 8:55 AM ESTWind AdvisoryLWX4 hr
Jan 23, 12:54 PM ESTWind AdvisoryLWX21 hr
Jan 29, 9:00 PM ESTWind AdvisoryLWX20 hr
Jan 30, 3:33 AM ESTWind Chill AdvisoryLWX30 hr
Feb 7, 8:32 PM ESTDense Fog AdvisoryLWX8 hr
Feb 19, 2:47 AM ESTWinter Weather AdvisoryLWX46 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 22, 4:21 PM EDTSevere Thunderstorm WarningLWX39 min
Apr 8, 5:46 PM EDTSevere Thunderstorm WarningLWX74 min
Apr 14, 6:08 PM EDTTornado WatchSPC9 hr
Apr 15, 2:11 AM EDTTornado WarningLWX23 min
Apr 15, 2:13 AM EDTSevere Thunderstorm WarningLWX23 min
Apr 15, 2:18 AM EDTSevere Thunderstorm WarningLWX34 min
Apr 18, 2:07 PM EDTFlash Flood WatchLWX32 hr
Apr 19, 12:48 PM EDTTornado WatchSPC9 hr
Apr 19, 8:34 PM EDTSevere Thunderstorm WarningLWX28 min
Apr 19, 9:10 PM EDTCoastal Flood AdvisoryLWX15 hr
Apr 26, 11:37 AM EDTMesoscale DiscussionSPC113 min
Apr 26, 1:33 PM EDTTornado WatchSPC6 hr
Apr 26, 3:23 PM EDTSevere Thunderstorm WarningLWX67 min
May 2, 3:28 PM EDTMesoscale DiscussionSPC2 hr
May 2, 6:35 PM EDTSevere Thunderstorm WarningLWX40 min
May 6, 2:24 PM EDTCoastal Flood AdvisoryLWX19 hr
May 13, 5:39 AM EDTCoastal Flood AdvisoryLWX14 hr
May 13, 10:04 AM EDTCoastal Flood AdvisoryLWX21 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, 3:55 PM EDTSevere Thunderstorm WarningLWX65 min
May 23, 4:10 PM EDTSevere Thunderstorm WarningLWX50 min
May 23, 4:42 PM EDTSevere Thunderstorm WarningLWX48 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, 6:35 PM EDTSevere Thunderstorm WarningLWX12 min
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, 3:56 PM EDTMesoscale DiscussionSPC64 min
May 30, 4:19 PM EDTSevere Thunderstorm WarningLWX41 min
Jun 2, 12:53 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 2, 3:33 PM EDTMesoscale DiscussionSPC87 min
Jun 2, 5:57 PM EDTMesoscale DiscussionSPC93 min
Jun 2, 6:53 PM EDTSevere Thunderstorm WarningLWX52 min
Jun 2, 7:10 PM EDTSevere Thunderstorm WarningLWX50 min
Jun 5, 12:52 PM EDTMesoscale DiscussionSPC113 min
Jun 5, 2:33 PM EDTSevere Thunderstorm WatchSPC5 hr
Jun 13, 6:04 PM EDTSevere Thunderstorm WarningLWX41 min
Jun 13, 7:30 PM EDTSevere Thunderstorm WarningLWX15 min
Jun 17, 2:03 PM EDTMesoscale DiscussionSPC117 min
Jun 17, 4:05 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 17, 4:10 PM EDTSevere Thunderstorm WarningLWX50 min
Jun 17, 4:38 PM EDTSevere Thunderstorm WarningLWX37 min
Jun 17, 5:40 PM EDTSevere Thunderstorm WarningLWX34 min
Jun 17, 7:13 PM EDTSevere Thunderstorm WarningLWX15 min
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, 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
Jun 29, 2:37 PM EDTSevere Thunderstorm WarningLWX53 min
Jun 29, 3:27 PM EDTSevere Thunderstorm WarningLWX33 min
Jun 29, 4:08 PM EDTAreal Flood WarningLWX118 min
Jun 29, 5:05 PM EDTSevere Thunderstorm WarningLWX39 min
Jun 29, 7:59 PM EDTSevere Thunderstorm WarningLWX46 min
Jun 29, 8:33 PM EDTSevere Thunderstorm WarningLWX13 min
Jul 2, 5:53 PM EDTMesoscale DiscussionSPC2 hr
Jul 4, 12:49 PM EDTMesoscale DiscussionSPC116 min
Jul 6, 1:48 PM EDTMesoscale DiscussionSPC2 hr
Jul 8, 11:21 AM EDTAreal Flood WarningLWX3 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 11, 6:34 PM EDTSevere Thunderstorm WarningLWX56 min
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, 5:35 PM EDTSevere Thunderstorm WarningLWX40 min
Jul 17, 6:38 PM EDTMesoscale DiscussionSPC97 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, 3:05 PM EDTExcessive Heat WarningLWX30 hr
Jul 20, 8:49 PM EDTExcessive Heat WarningLWX24 hr
Jul 21, 2:48 PM EDTHeat AdvisoryLWX28 hr
Jul 21, 6:07 PM EDTMesoscale DiscussionSPC83 min
Jul 22, 1:11 PM EDTMesoscale DiscussionSPC94 min
Jul 22, 2:17 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 22, 8:51 PM EDTMesoscale DiscussionSPC84 min
Jul 31, 1:17 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 31, 4:19 PM EDTMesoscale DiscussionSPC56 min
Jul 31, 4:45 PM EDTSevere Thunderstorm WarningLWX45 min
Jul 31, 5:21 PM EDTSevere Thunderstorm WarningLWX39 min
Jul 31, 5:56 PM EDTAreal Flood WarningLWX98 min
Jul 31, 6:16 PM EDTSevere Thunderstorm WarningLWX44 min
Aug 1, 6:01 PM EDTSevere Thunderstorm WarningLWX44 min
Aug 1, 6:40 PM EDTSevere Thunderstorm WarningLWX36 min
Aug 5, 1:57 PM EDTSevere Thunderstorm WarningLWX26 min
Aug 7, 1:02 PM EDTMesoscale DiscussionSPC88 min
Aug 7, 1:53 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 7, 4:30 PM EDTSevere Thunderstorm WarningLWX45 min
Aug 9, 2:25 PM EDTMesoscale DiscussionSPC95 min
Aug 17, 3:46 PM EDTSevere Thunderstorm WarningLWX44 min
Aug 20, 3:02 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 20, 4:45 PM EDTSevere Thunderstorm WarningLWX45 min
Aug 20, 7:00 PM EDTMesoscale DiscussionSPC2 hr
Aug 21, 3:27 PM EDTSevere Thunderstorm WatchSPC4 hr
Aug 21, 6:45 PM EDTSevere Thunderstorm WarningLWX21 min
Aug 26, 2:20 PM EDTCoastal Flood AdvisoryLWX42 hr
Sep 6, 3:22 AM EDTCoastal Flood WatchLWX36 hr
Sep 7, 5:22 AM EDTCoastal Flood AdvisoryLWX26 hr
Sep 7, 3:15 PM EDTCoastal Flood AdvisoryLWX35 hr
Sep 8, 2:11 AM EDTCoastal Flood AdvisoryLWX7 hr
Sep 11, 3:08 PM EDTMesoscale DiscussionSPC2 hr
Sep 12, 2:02 PM EDTMesoscale DiscussionSPC118 min
Sep 13, 10:07 PM EDTCoastal Flood AdvisoryLWX24 hr
Sep 18, 10:22 AM EDTCoastal Flood AdvisoryLWX36 hr
Oct 4, 3:10 AM EDTCoastal Flood AdvisoryLWX11 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 12, 8:45 PM EDTCoastal Flood AdvisoryLWX20 hr
Oct 16, 3:51 AM EDTWind AdvisoryLWX34 hr
Oct 16, 3:58 AM EDTCoastal Flood AdvisoryLWX20 hr
Oct 21, 6:14 PM EDTCoastal Flood AdvisoryLWX36 hr
Oct 22, 3:25 PM EDTCoastal Flood AdvisoryLWX10 hr
Oct 27, 5:25 AM EDTCoastal Flood AdvisoryLWX18 hr
Oct 31, 3:48 AM EDTWind AdvisoryLWX24 hr
Oct 31, 1:58 PM EDTCoastal Flood AdvisoryLWX15 hr
Oct 31, 2:56 PM EDTTornado WatchSPC10 hr
Oct 31, 7:14 PM EDTMesoscale DiscussionSPC2 hr
Oct 31, 9:58 PM EDTMesoscale DiscussionSPC2 hr
Oct 31, 11:10 PM EDTSevere Thunderstorm WarningLWX50 min
Oct 31, 11:23 PM EDTSevere Thunderstorm WarningLWX22 min
Nov 1, 4:07 AM EDTFreeze WatchLWX5 hr
Nov 1, 9:17 AM EDTFreeze WarningLWX24 hr
Nov 3, 1:15 AM ESTFreeze WarningLWX31 hr
Nov 18, 2:23 PM ESTCoastal Flood AdvisoryLWX37 hr
Dec 1, 7:00 AM ESTCoastal Flood AdvisoryLWX18 hr
Dec 31, 1:26 PM ESTCoastal Flood AdvisoryLWX13 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.