Alert archive / Maryland / Calvert County

Weather alerts in Calvert County, Maryland, 2010

183 weather alerts in 2010, 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 2010. Tap one for its archive.

Alerts
183
Warnings
42
Watches
43
Advisories
38
Busiest month
September27 alerts
Busiest day
September 30, 201014 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 6 tornado warnings covering Calvert County in 2010 had a tornado report inside them.

Calvert County, 2010

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings60100%0
Severe thunderstorm warnings16156%1292%25 min
Flash flood warnings7529%4100%183 min

Each office's whole area, 2010

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Baltimore/Washington: tornado warnings31294%450%17 min
NWS Baltimore/Washington: severe thunderstorm warnings25719823%76286%21 min
NWS Baltimore/Washington: flash flood warnings643545%13992%166 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 2, 4:21 AM ESTWind AdvisoryLWX38 hr
Jan 7, 3:48 AM ESTWinter Weather AdvisoryLWX57 hr
Jan 23, 1:08 PM ESTFlash Flood WatchLWX48 hr
Jan 24, 10:03 AM ESTCoastal Flood AdvisoryLWX19 hr
Jan 24, 6:02 PM ESTCoastal Flood WarningLWX21 hr
Jan 24, 6:06 PM ESTWind AdvisoryLWX19 hr
Jan 25, 3:19 PM ESTCoastal Flood AdvisoryLWX14 hr
Jan 29, 6:05 PM ESTWinter Storm WarningLWX33 hr
Jan 30, 8:10 AM ESTMesoscale DiscussionSPC5 hr
Jan 30, 11:03 AM ESTMesoscale DiscussionSPC5 hr
Feb 2, 3:07 AM ESTWinter Weather AdvisoryLWX26 hr
Feb 3, 2:45 PM ESTWinter Storm WatchLWX19 hr
Feb 4, 9:59 AM ESTWinter Storm WarningLWX55 hr
Feb 5, 11:45 AM ESTMesoscale DiscussionSPC4 hr
Feb 5, 1:09 PM ESTCoastal Flood AdvisoryLWX32 hr
Feb 5, 3:06 PM ESTBlizzard WarningLWX26 hr
Feb 5, 6:58 PM ESTMesoscale DiscussionSPC4 hr
Feb 5, 11:53 PM ESTMesoscale DiscussionSPC4 hr
Feb 6, 6:53 AM ESTMesoscale DiscussionSPC4 hr
Feb 6, 12:03 PM ESTMesoscale DiscussionSPC4 hr
Feb 7, 3:15 PM ESTWinter Storm WatchLWX35 hr
Feb 8, 3:04 PM ESTWinter Storm WarningLWX46 hr
Feb 9, 7:04 PM ESTMesoscale DiscussionSPC4 hr
Feb 10, 3:45 AM ESTBlizzard WarningLWX23 hr
Feb 10, 7:27 AM ESTMesoscale DiscussionSPC5 hr
Feb 10, 12:20 PM ESTMesoscale DiscussionSPC4 hr
Feb 23, 5:31 AM ESTWinter Storm WatchLWX55 hr
Feb 24, 1:48 PM ESTWinter Weather AdvisoryLWX15 hr
Feb 25, 9:35 AM ESTHigh Wind WatchLWX6 hr
Feb 25, 3:41 PM ESTHigh Wind WarningLWX26 hr
Feb 25, 3:41 PM ESTWind AdvisoryLWX24 hr
Mar 10, 5:46 AM ESTFlood WatchLWX3 days
Mar 12, 11:02 AM ESTCoastal Flood WatchLWX17 hr
Mar 12, 5:54 PM ESTCoastal Flood AdvisoryLWX10 hr
Mar 13, 4:09 AM ESTCoastal Flood WarningLWX4 days
Mar 15, 4:15 AM EDTCoastal Flood AdvisoryLWX31 hr
Mar 16, 7:00 PM EDTCoastal Flood AdvisoryLWX41 hr
Mar 28, 9:13 AM EDTCoastal Flood AdvisoryLWX42 hr
Mar 29, 9:04 AM EDTFlood WatchLWX6 hr
Apr 8, 8:12 PM EDTSevere Thunderstorm WarningLWX31 min
Apr 16, 1:32 PM EDTRed Flag WarningLWX6 hr
Apr 16, 7:21 PM EDTSpecial Weather StatementLWX84 min
Apr 17, 9:31 AM EDTRed Flag WarningLWX11 hr
Apr 22, 12:37 AM EDTDense Fog AdvisoryLWX8 hr
Apr 25, 4:37 PM EDTSevere Thunderstorm WatchSPC6 hr
Apr 25, 6:16 PM EDTMesoscale DiscussionSPC89 min
Apr 25, 8:53 PM EDTMesoscale DiscussionSPC2 hr
Apr 26, 6:13 PM EDTMesoscale DiscussionSPC62 min
May 2, 4:45 PM EDTMesoscale DiscussionSPC60 min
May 14, 2:29 PM EDTSevere Thunderstorm WatchSPC7 hr
May 14, 7:24 PM EDTSevere Thunderstorm WarningLWX39 min
May 14, 7:34 PM EDTTornado WarningLWX26 min
May 27, 3:20 AM EDTFlash Flood WatchLWX24 hr
May 27, 1:23 PM EDTSevere Thunderstorm WatchSPC8 hr
May 27, 4:13 PM EDTMesoscale DiscussionSPC62 min
May 27, 8:08 PM EDTMesoscale DiscussionSPC97 min
May 28, 2:31 PM EDTCoastal Flood AdvisoryLWX21 hr
Jun 3, 11:27 AM EDTMesoscale DiscussionSPC93 min
Jun 3, 1:32 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 3, 3:36 PM EDTMesoscale DiscussionSPC54 min
Jun 3, 5:30 PM EDTSevere Thunderstorm WarningLWX45 min
Jun 3, 6:20 PM EDTSevere Thunderstorm WarningLWX25 min
Jun 3, 6:28 PM EDTMesoscale DiscussionSPC62 min
Jun 4, 2:39 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 4, 7:03 PM EDTMesoscale DiscussionSPC57 min
Jun 6, 11:42 AM EDTMesoscale DiscussionSPC63 min
Jun 6, 12:40 PM EDTTornado WatchSPC6 hr
Jun 6, 2:38 PM EDTMesoscale DiscussionSPC67 min
Jun 12, 3:10 PM EDTSevere Thunderstorm WatchSPC4 hr
Jun 22, 7:27 PM EDTMesoscale DiscussionSPC63 min
Jun 22, 8:45 PM EDTSpecial Weather StatementLWX30 min
Jun 24, 12:28 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 24, 2:34 PM EDTMesoscale DiscussionSPC116 min
Jun 24, 6:09 PM EDTSpecial Weather StatementLWX36 min
Jun 24, 6:42 PM EDTSpecial Weather StatementLWX78 min
Jun 28, 12:26 PM EDTMesoscale DiscussionSPC2 hr
Jun 28, 1:12 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 28, 3:53 PM EDTMesoscale DiscussionSPC2 hr
Jul 5, 1:50 PM EDTHeat AdvisoryLWX54 hr
Jul 5, 7:38 PM EDTExcessive Heat WatchLWX9 hr
Jul 13, 2:21 PM EDTFlash Flood WatchLWX13 hr
Jul 13, 6:02 PM EDTMesoscale DiscussionSPC58 min
Jul 13, 8:45 PM EDTSevere Thunderstorm WarningLWX45 min
Jul 13, 8:53 PM EDTSevere Thunderstorm WarningLWX43 min
Jul 14, 1:11 AM EDTSpecial Weather StatementLWX49 min
Jul 16, 3:10 AM EDTHeat AdvisoryLWX15 hr
Jul 19, 10:21 PM EDTSpecial Weather StatementLWX24 min
Jul 22, 2:06 PM EDTExcessive Heat WatchLWX31 hr
Jul 22, 2:06 PM EDTHeat AdvisoryLWX31 hr
Jul 23, 9:14 PM EDTHeat AdvisoryLWX47 hr
Jul 25, 1:21 PM EDTMesoscale DiscussionSPC54 min
Jul 25, 1:46 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 25, 3:25 PM EDTMesoscale DiscussionSPC65 min
Jul 25, 3:42 PM EDTSevere Thunderstorm WarningLWX63 min
Jul 25, 4:17 PM EDTSevere Thunderstorm WarningLWX58 min
Jul 29, 11:36 AM EDTMesoscale DiscussionSPC54 min
Jul 29, 11:54 AM EDTSevere Thunderstorm WatchSPC7 hr
Jul 29, 4:20 PM EDTMesoscale DiscussionSPC55 min
Aug 4, 3:07 PM EDTHeat AdvisoryLWX29 hr
Aug 4, 5:30 PM EDTMesoscale DiscussionSPC30 min
Aug 4, 8:36 PM EDTSevere Thunderstorm WatchSPC4 hr
Aug 5, 12:37 PM EDTMesoscale DiscussionSPC53 min
Aug 5, 1:19 PM EDTSevere Thunderstorm WatchSPC9 hr
Aug 5, 3:45 PM EDTSevere Thunderstorm WarningLWX60 min
Aug 5, 3:56 PM EDTMesoscale DiscussionSPC64 min
Aug 5, 4:18 PM EDTTornado WarningLWX21 min
Aug 5, 5:22 PM EDTSevere Thunderstorm WarningLWX53 min
Aug 5, 6:19 PM EDTSpecial Weather StatementLWX26 min
Aug 5, 6:23 PM EDTMesoscale DiscussionSPC97 min
Aug 12, 7:01 AM EDTMesoscale DiscussionSPC119 min
Aug 12, 7:40 AM EDTSevere Thunderstorm WarningLWX50 min
Aug 12, 8:12 AM EDTSevere Thunderstorm WarningLWX63 min
Aug 12, 9:15 AM EDTSpecial Weather StatementLWX30 min
Aug 12, 9:19 AM EDTFlash Flood WarningLWX86 min
Aug 12, 9:45 AM EDTSpecial Weather StatementLWX45 min
Aug 12, 1:52 PM EDTMesoscale DiscussionSPC83 min
Aug 12, 2:51 PM EDTSevere Thunderstorm WatchSPC5 hr
Aug 12, 7:10 PM EDTCoastal Flood AdvisoryLWX3 days
Aug 13, 12:26 AM EDTFlash Flood WarningLWX109 min
Aug 16, 2:01 PM EDTMesoscale DiscussionSPC89 min
Aug 16, 2:13 PM EDTSevere Thunderstorm WatchSPC6 hr
Aug 17, 2:58 PM EDTFlood WatchLWX29 hr
Aug 24, 2:50 PM EDTCoastal Flood AdvisoryLWX30 hr
Sep 1, 3:28 PM EDTCoastal Flood WatchLWX24 hr
Sep 2, 3:14 AM EDTCoastal Flood AdvisoryLWX24 hr
Sep 7, 2:39 PM EDTFire Weather WatchLWX19 hr
Sep 7, 9:44 PM EDTCoastal Flood AdvisoryLWX13 hr
Sep 22, 10:54 AM EDTCoastal Flood AdvisoryLWX10 hr
Sep 22, 2:45 PM EDTSevere Thunderstorm WatchSPC7 hr
Sep 27, 3:43 AM EDTFlash Flood WatchLWX28 hr
Sep 27, 10:41 AM EDTCoastal Flood WatchLWX16 hr
Sep 27, 10:41 AM EDTCoastal Flood AdvisoryLWX39 hr
Sep 28, 8:00 AM EDTMesoscale DiscussionSPC2 hr
Sep 29, 2:21 AM EDTFlash Flood WatchLWX50 hr
Sep 29, 2:41 AM EDTCoastal Flood WatchLWX18 hr
Sep 29, 2:45 PM EDTWind AdvisoryLWX23 hr
Sep 29, 8:48 PM EDTCoastal Flood AdvisoryLWX25 hr
Sep 30, 3:57 AM EDTTornado WarningLWX33 min
Sep 30, 4:55 AM EDTTornado WatchSPC8 hr
Sep 30, 4:57 AM EDTFlash Flood WarningLWX6 hr
Sep 30, 6:17 AM EDTTornado WarningLWX28 min
Sep 30, 8:09 AM EDTCoastal Flood WarningLWX21 hr
Sep 30, 8:25 AM EDTMesoscale DiscussionSPC95 min
Sep 30, 8:58 AM EDTTornado WarningLWX47 min
Sep 30, 9:49 AM EDTTornado WarningLWX26 min
Sep 30, 10:38 AM EDTFlash Flood WarningLWX6 hr
Sep 30, 10:49 AM EDTMesoscale DiscussionSPC116 min
Sep 30, 12:39 PM EDTTornado WatchSPC6 hr
Sep 30, 4:30 PM EDTFlash Flood WarningLWX6 hr
Sep 30, 6:13 PM EDTFlash Flood WarningLWX6 hr
Sep 30, 10:24 PM EDTFlash Flood WarningLWX6 hr
Oct 1, 3:08 AM EDTCoastal Flood AdvisoryLWX8 hr
Oct 27, 5:28 AM EDTMesoscale DiscussionSPC2 hr
Oct 27, 11:54 AM EDTMesoscale DiscussionSPC66 min
Oct 27, 12:13 PM EDTTornado WatchSPC8 hr
Oct 27, 2:04 PM EDTSpecial Weather StatementLWX41 min
Oct 27, 2:56 PM EDTSpecial Weather StatementLWX34 min
Oct 27, 3:21 PM EDTMesoscale DiscussionSPC54 min
Oct 27, 4:48 PM EDTMesoscale DiscussionSPC57 min
Oct 27, 7:16 PM EDTMesoscale DiscussionSPC59 min
Oct 27, 7:46 PM EDTTornado WatchSPC8 hr
Oct 27, 9:56 PM EDTDense Fog AdvisoryLWX7 hr
Nov 1, 1:57 PM EDTFrost AdvisoryLWX19 hr
Nov 7, 11:36 PM ESTFreeze WarningLWX9 hr
Nov 12, 2:21 AM ESTCoastal Flood AdvisoryLWX56 hr
Nov 16, 11:27 PM ESTMesoscale DiscussionSPC2 hr
Nov 17, 12:06 AM ESTSevere Thunderstorm WatchSPC4 hr
Nov 17, 12:35 AM ESTSevere Thunderstorm WarningLWX40 min
Nov 17, 12:43 AM ESTSevere Thunderstorm WarningLWX47 min
Nov 17, 1:04 AM ESTSevere Thunderstorm WarningLWX86 min
Nov 22, 2:08 AM ESTDense Fog AdvisoryLWX8 hr
Nov 30, 3:12 AM ESTWind AdvisoryLWX32 hr
Nov 30, 9:59 AM ESTCoastal Flood WatchLWX8 hr
Nov 30, 5:49 PM ESTCoastal Flood AdvisoryLWX24 hr
Dec 1, 3:48 AM ESTTornado WatchSPC7 hr
Dec 1, 6:37 AM ESTSevere Thunderstorm WarningLWX53 min
Dec 1, 7:51 AM ESTMesoscale DiscussionSPC84 min
Dec 1, 9:43 AM ESTSpecial Weather StatementLWX62 min
Dec 13, 10:28 AM ESTWind AdvisoryLWX36 hr
Dec 15, 2:21 PM ESTWinter Weather AdvisoryLWX29 hr
Dec 25, 3:09 AM ESTWinter Storm WatchLWX13 hr
Dec 25, 3:42 PM ESTWinter Storm WarningLWX31 hr
Dec 26, 2:42 PM ESTWind AdvisoryLWX30 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 archive20092011

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.