Alert archive / Maryland / Calvert County

Weather alerts in Calvert County, Maryland, 2024

124 weather alerts in 2024, 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 2024. Tap one for its archive.

Alerts
124
Warnings
26
Watches
20
Advisories
51
Busiest month
July34 alerts
Busiest day
July 17, 20246 alerts

Over time

By month

Warning verification

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

Calvert County, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings161038%1070%8 min
Flash flood warnings00

Each office's whole area, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Baltimore/Washington: tornado warnings501276%3569%19 min
NWS Baltimore/Washington: severe thunderstorm warnings30620334%53685%19 min
NWS Baltimore/Washington: flash flood warnings592656%6082%97 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 7, 6:02 PM ESTCoastal Flood WatchLWX33 hr
Jan 8, 1:57 AM ESTFlood WatchLWX44 hr
Jan 8, 3:48 AM ESTWind AdvisoryLWX41 hr
Jan 8, 2:33 PM ESTHigh Wind WarningLWX31 hr
Jan 8, 3:41 PM ESTCoastal Flood WarningLWX47 hr
Jan 10, 1:05 AM ESTCoastal Flood AdvisoryLWX19 hr
Jan 11, 3:10 PM ESTWind AdvisoryLWX50 hr
Jan 12, 4:16 AM ESTCoastal Flood AdvisoryLWX44 hr
Jan 13, 11:04 AM ESTCoastal Flood AdvisoryLWX9 hr
Jan 14, 2:35 PM ESTWinter Weather AdvisoryLWX43 hr
Jan 18, 8:26 AM ESTWinter Weather AdvisoryLWX33 hr
Jan 26, 7:22 PM ESTDense Fog AdvisoryLWX11 hr
Jan 27, 1:40 PM ESTFlood WatchLWX18 hr
Jan 29, 8:24 PM ESTCoastal Flood AdvisoryLWX52 hr
Jan 30, 2:58 AM ESTCoastal Flood AdvisoryLWX3 days
Feb 3, 7:59 PM ESTCoastal Flood AdvisoryLWX6 days
Feb 11, 8:41 AM ESTCoastal Flood AdvisoryLWX51 hr
Feb 16, 3:24 AM ESTWinter Weather AdvisoryLWX25 hr
Feb 27, 2:58 PM ESTWind AdvisoryLWX36 hr
Mar 8, 6:12 PM ESTCoastal Flood AdvisoryLWX38 hr
Mar 9, 3:15 AM ESTWind AdvisoryLWX61 hr
Mar 21, 2:10 PM EDTFlood WatchLWX47 hr
Mar 25, 4:37 AM EDTCoastal Flood AdvisoryLWX62 hr
Apr 3, 3:26 AM EDTCoastal Flood AdvisoryLWX65 hr
Apr 3, 11:20 AM EDTMesoscale DiscussionSPC115 min
Apr 3, 12:38 PM EDTTornado WatchSPC6 hr
Apr 8, 11:37 PM EDTCoastal Flood AdvisoryLWX36 hr
Apr 10, 3:23 PM EDTCoastal Flood AdvisoryLWX43 hr
Apr 12, 12:15 AM EDTMesoscale DiscussionSPC2 hr
Apr 15, 1:03 PM EDTMesoscale DiscussionSPC117 min
Apr 15, 1:50 PM EDTSevere Thunderstorm WatchSPC8 hr
Apr 15, 4:40 PM EDTMesoscale DiscussionSPC95 min
Apr 19, 8:09 AM EDTCoastal Flood AdvisoryLWX20 hr
May 3, 9:04 AM EDTCoastal Flood AdvisoryLWX48 hr
May 5, 5:13 PM EDTCoastal Flood AdvisoryLWX16 hr
May 10, 1:04 AM EDTSevere Thunderstorm WarningLWX17 min
May 10, 2:34 AM EDTCoastal Flood AdvisoryLWX9 hr
May 10, 2:46 PM EDTCoastal Flood AdvisoryLWX53 hr
May 17, 9:19 AM EDTCoastal Flood AdvisoryLWX23 hr
May 21, 5:41 AM EDTDense Fog AdvisoryLWX3 hr
May 27, 11:53 AM EDTMesoscale DiscussionSPC2 hr
May 27, 3:39 PM EDTTornado WatchSPC7 hr
May 27, 4:49 PM EDTMesoscale DiscussionSPC86 min
May 27, 7:40 PM EDTMesoscale DiscussionSPC2 hr
May 27, 8:33 PM EDTSevere Thunderstorm WarningLWX42 min
May 29, 4:03 PM EDTSevere Thunderstorm WarningLWX27 min
Jun 6, 1:45 PM EDTMesoscale DiscussionSPC90 min
Jun 6, 2:26 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 6, 4:18 PM EDTMesoscale DiscussionSPC87 min
Jun 6, 7:25 PM EDTMesoscale DiscussionSPC95 min
Jun 21, 12:27 PM EDTHeat AdvisoryLWX32 hr
Jun 22, 12:12 PM EDTHeat AdvisoryLWX30 hr
Jun 26, 5:47 PM EDTSevere Thunderstorm WarningLWX43 min
Jun 26, 8:51 PM EDTSevere Thunderstorm WatchSPC3 hr
Jun 26, 10:09 PM EDTSevere Thunderstorm WarningLWX23 min
Jun 30, 12:11 PM EDTMesoscale DiscussionSPC2 hr
Jun 30, 3:21 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 30, 6:03 PM EDTMesoscale DiscussionSPC87 min
Jun 30, 7:24 PM EDTSevere Thunderstorm WarningLWX25 min
Jun 30, 8:05 PM EDTSevere Thunderstorm WarningLWX55 min
Jun 30, 8:10 PM EDTMesoscale DiscussionSPC95 min
Jun 30, 8:35 PM EDTSevere Thunderstorm Warning Destructive damage threatLWX25 min
Jun 30, 8:58 PM EDTSevere Thunderstorm WarningLWX37 min
Jul 4, 3:52 AM EDTHeat AdvisoryLWX40 hr
Jul 5, 3:52 AM EDTExcessive Heat WarningLWX16 hr
Jul 5, 11:48 PM EDTHeat AdvisoryLWX20 hr
Jul 6, 3:54 AM EDTExcessive Heat WarningLWX16 hr
Jul 7, 3:21 PM EDTHeat AdvisoryLWX29 hr
Jul 8, 2:25 PM EDTHeat AdvisoryLWX30 hr
Jul 9, 4:15 AM EDTHeat AdvisoryLWX39 hr
Jul 9, 1:08 PM EDTExcessive Heat WarningLWX7 hr
Jul 10, 4:59 AM EDTExcessive Heat WarningLWX15 hr
Jul 11, 3:01 PM EDTFlood WatchLWX42 hr
Jul 13, 1:39 PM EDTExcessive Heat WatchLWX23 hr
Jul 14, 9:33 AM EDTExcessive Heat WatchLWX27 hr
Jul 14, 12:56 PM EDTMesoscale DiscussionSPC3 hr
Jul 14, 12:59 PM EDTExcessive Heat WarningLWX31 hr
Jul 15, 12:55 PM EDTExcessive Heat WarningLWX31 hr
Jul 16, 11:44 AM EDTHeat AdvisoryLWX32 hr
Jul 16, 3:36 PM EDTSevere Thunderstorm WatchSPC9 hr
Jul 17, 2:11 PM EDTMesoscale DiscussionSPC79 min
Jul 17, 2:38 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 17, 4:26 PM EDTMesoscale DiscussionSPC94 min
Jul 17, 6:30 PM EDTSevere Thunderstorm WarningLWX45 min
Jul 17, 7:02 PM EDTSevere Thunderstorm WarningLWX43 min
Jul 17, 7:57 PM EDTMesoscale DiscussionSPC2 hr
Jul 25, 3:01 PM EDTMesoscale DiscussionSPC89 min
Jul 30, 12:39 PM EDTMesoscale DiscussionSPC2 hr
Jul 31, 3:25 PM EDTHeat AdvisoryLWX29 hr
Jul 31, 6:29 PM EDTSevere Thunderstorm WarningLWX46 min
Jul 31, 6:34 PM EDTSevere Thunderstorm WarningLWX41 min
Jul 31, 7:19 PM EDTSevere Thunderstorm WarningLWX41 min
Jul 31, 7:59 PM EDTSevere Thunderstorm WarningLWX30 min
Aug 1, 12:01 PM EDTHeat AdvisoryLWX32 hr
Aug 1, 2:53 PM EDTMesoscale DiscussionSPC2 hr
Aug 2, 4:34 AM EDTExcessive Heat WarningLWX15 hr
Aug 3, 12:56 PM EDTMesoscale DiscussionSPC94 min
Aug 3, 1:20 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 8, 3:24 PM EDTCoastal Flood AdvisoryLWX35 hr
Aug 8, 6:37 PM EDTTornado WatchSPC12 hr
Aug 8, 8:38 PM EDTMesoscale DiscussionSPC2 hr
Aug 9, 4:38 AM EDTMesoscale DiscussionSPC3 hr
Aug 9, 6:17 AM EDTTornado WatchSPC8 hr
Aug 17, 1:44 PM EDTCoastal Flood AdvisoryLWX22 hr
Aug 18, 1:09 PM EDTMesoscale DiscussionSPC96 min
Aug 18, 2:02 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 18, 4:30 PM EDTMesoscale DiscussionSPC90 min
Aug 19, 3:24 PM EDTMesoscale DiscussionSPC2 hr
Aug 27, 2:36 PM EDTHeat AdvisoryLWX28 hr
Sep 15, 1:57 PM EDTCoastal Flood AdvisoryLWX52 hr
Sep 18, 12:09 AM EDTCoastal Flood AdvisoryLWX9 days
Sep 26, 4:25 AM EDTCoastal Flood AdvisoryLWX23 hr
Sep 26, 3:53 PM EDTCoastal Flood AdvisoryLWX8 days
Oct 17, 1:54 PM EDTFrost AdvisoryLWX19 hr
Oct 26, 3:05 AM EDTFreeze WatchLWX24 hr
Oct 27, 3:06 AM EDTFreeze WarningLWX30 hr
Nov 5, 7:46 AM ESTDense Fog AdvisoryLWX65 min
Nov 14, 8:17 AM ESTCoastal Flood AdvisoryLWX40 hr
Nov 20, 1:59 AM ESTWind AdvisoryLWX23 hr
Dec 4, 4:22 AM ESTWind AdvisoryLWX44 hr
Dec 9, 9:31 PM ESTDense Fog AdvisoryLWX14 hr
Dec 10, 5:08 PM ESTDense Fog AdvisoryLWX13 hr
Dec 31, 4:04 PM ESTMesoscale DiscussionSPC116 min
Dec 31, 6:00 PM ESTSevere Thunderstorm WarningLWX45 min

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 archive20232025

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.