Alert archive / Maryland / Calvert County

Weather alerts in Calvert County, Maryland, 2013

146 weather alerts in 2013, 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 2013. Tap one for its archive.

Alerts
146
Warnings
29
Watches
28
Advisories
47
Busiest month
June46 alerts
Busiest day
June 13, 201310 alerts

Over time

By month

Warning verification

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

2 of 4 tornado warnings covering Calvert County in 2013 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 25 minutes after it went out.

Calvert County, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings4250%1100%25 min
Severe thunderstorm warnings151220%1346%21 min
Flash flood warnings4325%2100%26 min

Each office's whole area, 2013

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Baltimore/Washington: tornado warnings22959%2162%11 min
NWS Baltimore/Washington: severe thunderstorm warnings21014133%49574%21 min
NWS Baltimore/Washington: flash flood warnings815137%12478%74 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, 4:39 PM ESTDense Fog AdvisoryLWX19 hr
Jan 12, 7:27 PM ESTDense Fog AdvisoryLWX18 hr
Jan 13, 4:27 PM ESTDense Fog AdvisoryLWX13 hr
Jan 16, 3:28 AM ESTWinter Storm WatchLWX24 hr
Jan 16, 2:50 PM ESTWinter Storm WarningLWX30 hr
Jan 17, 3:43 AM ESTWinter Weather AdvisoryLWX21 hr
Jan 23, 3:58 PM ESTWinter Weather AdvisoryLWX19 hr
Jan 24, 7:52 PM ESTWinter Weather AdvisoryLWX46 hr
Jan 27, 4:02 AM ESTWinter Weather AdvisoryLWX32 hr
Jan 29, 2:54 PM ESTWind AdvisoryLWX47 hr
Jan 29, 2:55 PM ESTCoastal Flood WatchLWX14 hr
Jan 30, 4:42 AM ESTCoastal Flood AdvisoryLWX32 hr
Jan 30, 6:31 PM ESTTornado WatchSPC8 hr
Jan 30, 9:38 PM ESTMesoscale DiscussionSPC67 min
Jan 31, 1:21 AM ESTFlash Flood WarningLWX3 hr
Jan 31, 1:52 AM ESTSevere Thunderstorm WarningLWX53 min
Feb 8, 1:26 PM ESTWind AdvisoryLWX17 hr
Feb 26, 2:43 PM ESTCoastal Flood AdvisoryLWX21 hr
Feb 27, 1:03 PM ESTCoastal Flood AdvisoryLWX7 hr
Mar 4, 3:11 AM ESTWinter Storm WatchLWX36 hr
Mar 4, 8:48 PM ESTWinter Storm WarningLWX42 hr
Mar 5, 2:48 PM ESTWinter Weather AdvisoryLWX8 hr
Mar 5, 9:12 PM ESTCoastal Flood AdvisoryLWX17 hr
Mar 6, 12:07 PM ESTWinter Weather AdvisoryLWX2 hr
Mar 6, 4:27 PM ESTWind AdvisoryLWX4 hr
Mar 9, 12:00 PM ESTCoastal Flood AdvisoryLWX5 hr
Mar 9, 2:38 PM ESTCoastal Flood AdvisoryLWX3 days
Mar 11, 10:37 AM EDTCoastal Flood WatchLWX10 hr
Apr 1, 1:25 AM EDTDense Fog AdvisoryLWX8 hr
Apr 2, 3:32 PM EDTFire Weather WatchLWX13 hr
Apr 12, 2:42 PM EDTSpecial Weather StatementLWX18 min
Apr 19, 1:27 PM EDTMesoscale DiscussionSPC63 min
Apr 19, 2:31 PM EDTTornado WatchSPC7 hr
Apr 19, 4:36 PM EDTMesoscale DiscussionSPC114 min
Apr 19, 6:05 PM EDTCoastal Flood AdvisoryLWX9 hr
Apr 19, 6:54 PM EDTMesoscale DiscussionSPC66 min
Apr 19, 7:00 PM EDTSevere Thunderstorm WarningLWX45 min
Apr 19, 7:18 PM EDTSevere Thunderstorm WarningLWX42 min
Apr 19, 7:22 PM EDTSevere Thunderstorm WarningLWX38 min
Apr 19, 8:00 PM EDTSevere Thunderstorm WarningLWX30 min
Apr 23, 11:22 PM EDTCoastal Flood AdvisoryLWX23 hr
Apr 25, 12:07 AM EDTCoastal Flood AdvisoryLWX5 hr
Apr 29, 10:34 PM EDTCoastal Flood AdvisoryLWX8 hr
May 4, 8:17 PM EDTCoastal Flood AdvisoryLWX8 hr
May 5, 9:01 PM EDTCoastal Flood AdvisoryLWX11 hr
May 6, 1:45 PM EDTCoastal Flood AdvisoryLWX16 hr
May 8, 2:55 PM EDTSpecial Weather StatementLWX35 min
May 8, 11:27 PM EDTDense Fog AdvisoryLWX9 hr
May 11, 1:44 PM EDTMesoscale DiscussionSPC91 min
May 11, 7:11 PM EDTMesoscale DiscussionSPC64 min
May 11, 9:17 PM EDTSpecial Weather StatementLWX43 min
May 16, 12:04 PM EDTMesoscale DiscussionSPC56 min
May 23, 3:37 PM EDTMesoscale DiscussionSPC53 min
May 28, 4:01 PM EDTMesoscale DiscussionSPC2 hr
May 28, 7:31 PM EDTSevere Thunderstorm WarningLWX44 min
May 28, 7:58 PM EDTSevere Thunderstorm WarningLWX47 min
Jun 2, 3:18 PM EDTMesoscale DiscussionSPC2 hr
Jun 6, 2:18 PM EDTFlash Flood WatchLWX30 hr
Jun 6, 5:49 PM EDTCoastal Flood AdvisoryLWX17 hr
Jun 9, 9:09 PM EDTFlash Flood WatchLWX26 hr
Jun 10, 12:56 PM EDTMesoscale DiscussionSPC2 hr
Jun 10, 2:02 PM EDTTornado WatchSPC10 hr
Jun 10, 4:38 PM EDTMesoscale DiscussionSPC97 min
Jun 10, 6:49 PM EDTMesoscale DiscussionSPC86 min
Jun 10, 8:33 PM EDTTornado WarningLWX27 min
Jun 10, 8:41 PM EDTMesoscale DiscussionSPC64 min
Jun 12, 1:50 PM EDTFlash Flood WatchLWX30 hr
Jun 13, 12:14 AM EDTSevere Thunderstorm WarningLWX31 min
Jun 13, 2:40 AM EDTMesoscale DiscussionSPC2 hr
Jun 13, 3:58 AM EDTSevere Thunderstorm WatchSPC7 hr
Jun 13, 5:27 AM EDTMesoscale DiscussionSPC2 hr
Jun 13, 8:10 AM EDTMesoscale DiscussionSPC95 min
Jun 13, 11:38 AM EDTMesoscale DiscussionSPC67 min
Jun 13, 12:19 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 13, 3:17 PM EDTTornado WarningLWX28 min
Jun 13, 3:33 PM EDTTornado WarningLWX27 min
Jun 13, 4:22 PM EDTMesoscale DiscussionSPC53 min
Jun 15, 3:26 AM EDTCoastal Flood AdvisoryLWX11 hr
Jun 18, 3:54 AM EDTFlash Flood WatchLWX13 hr
Jun 18, 1:58 PM EDTFlash Flood WarningLWX3 hr
Jun 18, 4:51 PM EDTFlash Flood WarningLWX3 hr
Jun 19, 9:29 PM EDTCoastal Flood AdvisoryLWX7 hr
Jun 24, 2:44 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 24, 4:43 PM EDTMesoscale DiscussionSPC62 min
Jun 25, 8:46 PM EDTSevere Thunderstorm WatchSPC4 hr
Jun 26, 1:19 PM EDTMesoscale DiscussionSPC2 hr
Jun 26, 2:55 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 26, 4:38 PM EDTMesoscale DiscussionSPC97 min
Jun 27, 1:04 PM EDTMesoscale DiscussionSPC116 min
Jun 27, 1:58 PM EDTTornado WatchSPC7 hr
Jun 28, 2:08 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 28, 3:30 PM EDTMesoscale DiscussionSPC2 hr
Jun 28, 3:53 PM EDTSevere Thunderstorm WarningLWX37 min
Jun 28, 4:12 PM EDTSevere Thunderstorm WarningLWX33 min
Jun 28, 4:29 PM EDTSevere Thunderstorm WarningLWX46 min
Jun 28, 4:52 PM EDTSevere Thunderstorm WarningLWX38 min
Jun 28, 5:41 PM EDTSevere Thunderstorm WarningLWX19 min
Jun 28, 6:47 PM EDTMesoscale DiscussionSPC58 min
Jun 28, 8:00 PM EDTTornado WarningLWX45 min
Jun 30, 4:11 AM EDTFlash Flood WatchLWX40 hr
Jun 30, 11:48 AM EDTMesoscale DiscussionSPC2 hr
Jun 30, 4:44 PM EDTFlash Flood WarningLWX3 hr
Jul 2, 4:12 AM EDTFlash Flood WatchLWX13 hr
Jul 12, 3:46 AM EDTFlash Flood WatchLWX14 hr
Jul 17, 8:41 PM EDTHeat AdvisoryLWX22 hr
Jul 18, 7:41 PM EDTHeat AdvisoryLWX22 hr
Jul 19, 9:25 PM EDTHeat AdvisoryLWX21 hr
Jul 20, 1:07 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 20, 8:15 PM EDTMesoscale DiscussionSPC60 min
Jul 22, 11:38 PM EDTCoastal Flood AdvisoryLWX11 hr
Jul 28, 1:34 PM EDTMesoscale DiscussionSPC56 min
Jul 28, 6:33 PM EDTMesoscale DiscussionSPC117 min
Aug 6, 2:32 PM EDTCoastal Flood AdvisoryLWX21 hr
Aug 9, 3:17 PM EDTMesoscale DiscussionSPC58 min
Aug 9, 6:51 PM EDTSevere Thunderstorm WarningLWX39 min
Aug 9, 7:27 PM EDTSevere Thunderstorm WarningLWX63 min
Aug 13, 6:24 AM EDTMesoscale DiscussionSPC3 hr
Aug 20, 2:49 AM EDTDense Fog AdvisoryLWX7 hr
Aug 22, 2:26 PM EDTMesoscale DiscussionSPC3 hr
Aug 30, 10:13 AM EDTCoastal Flood AdvisoryLWX22 hr
Sep 12, 1:29 PM EDTMesoscale DiscussionSPC91 min
Sep 12, 2:50 PM EDTSevere Thunderstorm WatchSPC6 hr
Oct 6, 11:10 AM EDTCoastal Flood AdvisoryLWX12 hr
Oct 6, 5:41 PM EDTCoastal Flood AdvisoryLWX18 hr
Oct 7, 8:10 AM EDTMesoscale DiscussionSPC2 hr
Oct 7, 8:56 AM EDTTornado WatchSPC8 hr
Oct 7, 10:36 AM EDTMesoscale DiscussionSPC114 min
Oct 7, 12:01 PM EDTCoastal Flood AdvisoryLWX13 hr
Oct 7, 12:20 PM EDTMesoscale DiscussionSPC115 min
Oct 9, 4:28 AM EDTCoastal Flood AdvisoryLWX47 hr
Oct 11, 6:42 AM EDTFlood WatchLWX23 hr
Oct 11, 11:58 AM EDTCoastal Flood AdvisoryLWX16 hr
Oct 12, 7:55 AM EDTCoastal Flood AdvisoryLWX58 hr
Oct 17, 11:30 AM EDTCoastal Flood AdvisoryLWX12 hr
Oct 24, 1:34 PM EDTFreeze WarningLWX19 hr
Oct 25, 11:40 AM EDTFreeze WarningLWX21 hr
Nov 10, 12:27 PM ESTRed Flag WarningLWX5 hr
Nov 17, 1:11 AM ESTDense Fog AdvisoryLWX8 hr
Nov 18, 2:31 AM ESTMesoscale DiscussionSPC89 min
Nov 23, 11:05 AM ESTFire Weather WatchLWX17 hr
Nov 24, 3:23 AM ESTRed Flag WarningLWX15 hr
Dec 7, 5:55 PM ESTWinter Weather AdvisoryLWX37 hr
Dec 8, 11:05 AM ESTMesoscale DiscussionSPC3 hr
Dec 9, 2:29 PM ESTWinter Weather AdvisoryLWX21 hr
Dec 22, 10:00 AM ESTMesoscale DiscussionSPC60 min
Dec 22, 3:14 PM ESTFlood WatchLWX17 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 archive20122014

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.