Alert archive / Maryland / Howard County

Weather alerts in Howard County, Maryland, 2011

182 weather alerts in 2011, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Howard County and its neighbors

Each county as a circle sized by its count in 2011. Tap one for its archive.

Alerts
182
Warnings
60
Watches
23
Advisories
0
Busiest month
April42 alerts
Busiest day
April 28, 20119 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 3 tornado warnings covering Howard County in 2011 had a tornado report inside them.

Howard County, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings30100%0
Severe thunderstorm warnings302420%1392%17 min
Flash flood warnings211243%1681%110 min

Each office's whole area, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Baltimore/Washington: tornado warnings962772%4567%11 min
NWS Baltimore/Washington: severe thunderstorm warnings44033524%96378%18 min
NWS Baltimore/Washington: flash flood warnings1709942%34184%121 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 17, 7:44 PM ESTMesoscale DiscussionSPC6 hr
Jan 26, 2:19 PM ESTMesoscale DiscussionSPC6 hr
Feb 21, 5:58 PM ESTMesoscale DiscussionSPC4 hr
Feb 21, 6:33 PM ESTMesoscale DiscussionSPC5 hr
Feb 25, 11:22 AM ESTSpecial Weather StatementLWX53 min
Feb 25, 12:19 PM ESTSevere Thunderstorm WatchSPC3 hr
Feb 25, 12:22 PM ESTSpecial Weather StatementLWX38 min
Feb 25, 1:02 PM ESTSpecial Weather StatementLWX28 min
Feb 25, 1:25 PM ESTSevere Thunderstorm WarningLWX33 min
Feb 25, 2:40 PM ESTMesoscale DiscussionSPC65 min
Feb 28, 8:36 AM ESTMesoscale DiscussionSPC24 min
Feb 28, 8:57 AM ESTTornado WatchSPC9 hr
Mar 6, 2:26 PM ESTSpecial Weather StatementLWX64 min
Mar 10, 12:37 PM ESTAreal Flood WarningLWX6 hr
Mar 10, 1:25 PM ESTSevere Thunderstorm WatchSPC7 hr
Mar 10, 6:29 PM ESTFlash Flood WarningLWX4 hr
Mar 10, 7:20 PM ESTSpecial Weather StatementLWX25 min
Mar 23, 4:13 PM EDTSevere Thunderstorm WatchSPC5 hr
Mar 23, 8:13 PM EDTMesoscale DiscussionSPC92 min
Apr 2, 2:14 PM EDTSpecial Weather StatementLWX31 min
Apr 3, 9:46 PM EDTSpecial Weather StatementLWX44 min
Apr 5, 2:13 AM EDTMesoscale DiscussionSPC32 min
Apr 5, 2:18 AM EDTTornado WatchSPC8 hr
Apr 5, 3:34 AM EDTMesoscale DiscussionSPC116 min
Apr 5, 3:56 AM EDTSpecial Weather StatementLWX64 min
Apr 5, 4:40 AM EDTSevere Thunderstorm WarningLWX53 min
Apr 5, 8:32 AM EDTSpecial Weather StatementLWX58 min
Apr 16, 12:52 PM EDTMesoscale DiscussionSPC113 min
Apr 16, 1:29 PM EDTTornado WatchSPC8 hr
Apr 16, 4:29 PM EDTMesoscale DiscussionSPC31 min
Apr 16, 4:59 PM EDTSevere Thunderstorm WarningLWX46 min
Apr 16, 6:15 PM EDTSpecial Weather StatementLWX60 min
Apr 16, 6:38 PM EDTMesoscale DiscussionSPC97 min
Apr 16, 7:38 PM EDTSevere Thunderstorm WarningLWX52 min
Apr 16, 8:12 PM EDTMesoscale DiscussionSPC63 min
Apr 19, 3:47 PM EDTSpecial Weather StatementLWX28 min
Apr 24, 2:12 PM EDTMesoscale DiscussionSPC93 min
Apr 24, 3:40 PM EDTSevere Thunderstorm WatchSPC5 hr
Apr 24, 4:07 PM EDTSevere Thunderstorm WarningLWX38 min
Apr 24, 4:30 PM EDTSevere Thunderstorm WarningLWX45 min
Apr 24, 4:43 PM EDTSevere Thunderstorm WarningLWX47 min
Apr 24, 6:10 PM EDTMesoscale DiscussionSPC65 min
Apr 24, 7:19 PM EDTSpecial Weather StatementLWX26 min
Apr 24, 7:54 PM EDTSevere Thunderstorm WarningLWX32 min
Apr 24, 9:02 PM EDTMesoscale DiscussionSPC58 min
Apr 27, 1:23 PM EDTTornado WatchSPC5 hr
Apr 27, 4:39 PM EDTMesoscale DiscussionSPC66 min
Apr 27, 6:00 PM EDTMesoscale DiscussionSPC60 min
Apr 27, 6:15 PM EDTTornado WatchSPC6 hr
Apr 27, 7:27 PM EDTSpecial Weather StatementLWX33 min
Apr 27, 7:31 PM EDTTornado WarningLWX29 min
Apr 27, 7:55 PM EDTMesoscale DiscussionSPC65 min
Apr 28, 12:27 AM EDTMesoscale DiscussionSPC63 min
Apr 28, 12:41 AM EDTTornado WatchSPC7 hr
Apr 28, 7:05 AM EDTTornado WarningLWX25 min
Apr 28, 7:27 AM EDTFlash Flood WarningLWX5 hr
Apr 28, 7:38 AM EDTTornado WatchSPC7 hr
Apr 28, 9:14 AM EDTTornado WarningLWX31 min
Apr 28, 9:39 AM EDTSevere Thunderstorm WarningLWX36 min
Apr 28, 10:10 AM EDTSpecial Weather StatementLWX50 min
Apr 28, 10:44 AM EDTMesoscale DiscussionSPC61 min
May 6, 7:04 PM EDTSpecial Weather StatementLWX26 min
May 6, 7:26 PM EDTSpecial Weather StatementLWX34 min
May 15, 1:38 PM EDTMesoscale DiscussionSPC2 hr
May 16, 5:06 PM EDTSpecial Weather StatementLWX24 min
May 16, 5:31 PM EDTSpecial Weather StatementLWX74 min
May 17, 6:27 PM EDTMesoscale DiscussionSPC2 hr
May 18, 11:55 AM EDTMesoscale DiscussionSPC65 min
May 18, 12:55 PM EDTSevere Thunderstorm WatchSPC8 hr
May 18, 3:08 PM EDTMesoscale DiscussionSPC67 min
May 18, 6:01 PM EDTMesoscale DiscussionSPC89 min
May 19, 7:22 PM EDTSevere Thunderstorm WarningLWX38 min
May 19, 8:00 PM EDTSpecial Weather StatementLWX30 min
May 19, 8:13 PM EDTSpecial Weather StatementLWX32 min
May 23, 10:33 AM EDTMesoscale DiscussionSPC87 min
May 23, 10:48 AM EDTSevere Thunderstorm WatchSPC9 hr
May 23, 2:33 PM EDTMesoscale DiscussionSPC87 min
May 23, 4:40 PM EDTMesoscale DiscussionSPC95 min
May 23, 6:13 PM EDTSevere Thunderstorm WarningLWX47 min
May 24, 4:27 PM EDTSpecial Weather StatementLWX33 min
May 24, 4:44 PM EDTSevere Thunderstorm WarningLWX19 min
May 27, 12:24 PM EDTMesoscale DiscussionSPC96 min
May 27, 12:57 PM EDTSevere Thunderstorm WatchSPC9 hr
May 27, 6:14 PM EDTMesoscale DiscussionSPC2 hr
May 27, 7:55 PM EDTSevere Thunderstorm WarningLWX50 min
May 27, 8:28 PM EDTSevere Thunderstorm WarningLWX47 min
Jun 1, 1:37 PM EDTMesoscale DiscussionSPC83 min
Jun 1, 2:24 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 9, 12:53 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 9, 1:45 PM EDTMesoscale DiscussionSPC90 min
Jun 9, 6:17 PM EDTMesoscale DiscussionSPC58 min
Jun 9, 7:25 PM EDTSpecial Weather StatementLWX35 min
Jun 9, 7:49 PM EDTSpecial Weather StatementLWX26 min
Jun 9, 8:04 PM EDTSevere Thunderstorm WarningLWX41 min
Jun 10, 5:28 PM EDTMesoscale DiscussionSPC92 min
Jun 10, 5:49 PM EDTSpecial Weather StatementLWX26 min
Jun 10, 6:12 PM EDTSpecial Weather StatementLWX33 min
Jun 10, 6:42 PM EDTSpecial Weather StatementLWX48 min
Jun 10, 6:55 PM EDTSevere Thunderstorm WarningLWX26 min
Jun 11, 12:44 PM EDTMesoscale DiscussionSPC91 min
Jun 12, 12:03 PM EDTMesoscale DiscussionSPC87 min
Jun 12, 1:48 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 12, 3:39 PM EDTMesoscale DiscussionSPC96 min
Jun 16, 6:01 PM EDTMesoscale DiscussionSPC89 min
Jun 22, 2:03 PM EDTMesoscale DiscussionSPC117 min
Jun 24, 1:05 PM EDTMesoscale DiscussionSPC2 hr
Jul 3, 4:21 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 3, 5:35 PM EDTSevere Thunderstorm WarningLWX35 min
Jul 3, 6:03 PM EDTSevere Thunderstorm WarningLWX72 min
Jul 7, 8:15 PM EDTFlash Flood WarningLWX3 hr
Jul 8, 11:44 AM EDTMesoscale DiscussionSPC61 min
Jul 8, 1:51 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 8, 3:33 PM EDTFlash Flood WarningLWX3 hr
Jul 8, 3:49 PM EDTFlash Flood WarningLWX3 hr
Jul 8, 4:10 PM EDTFlash Flood WarningLWX3 hr
Jul 8, 5:52 PM EDTMesoscale DiscussionSPC83 min
Jul 11, 5:47 PM EDTSevere Thunderstorm WatchSPC5 hr
Jul 11, 7:42 PM EDTSevere Thunderstorm WarningLWX48 min
Jul 11, 7:44 PM EDTMesoscale DiscussionSPC61 min
Jul 11, 8:06 PM EDTSevere Thunderstorm WarningLWX39 min
Jul 11, 8:15 PM EDTSevere Thunderstorm WarningLWX45 min
Jul 11, 8:46 PM EDTSevere Thunderstorm WarningLWX44 min
Jul 11, 8:56 PM EDTSevere Thunderstorm WarningLWX34 min
Jul 13, 2:21 PM EDTSevere Thunderstorm WatchSPC8 hr
Jul 22, 3:17 PM EDTMesoscale DiscussionSPC58 min
Jul 25, 1:12 PM EDTMesoscale DiscussionSPC2 hr
Jul 25, 3:16 PM EDTFlash Flood WarningLWX97 min
Jul 29, 6:17 PM EDTMesoscale DiscussionSPC88 min
Aug 1, 3:22 PM EDTMesoscale DiscussionSPC83 min
Aug 1, 6:01 PM EDTSpecial Weather StatementLWX29 min
Aug 1, 6:07 PM EDTSevere Thunderstorm WarningLWX38 min
Aug 9, 4:16 PM EDTSpecial Weather StatementLWX44 min
Aug 9, 4:24 PM EDTSevere Thunderstorm WarningLWX35 min
Aug 13, 2:07 PM EDTMesoscale DiscussionSPC113 min
Aug 13, 5:23 PM EDTSpecial Weather StatementLWX22 min
Aug 14, 9:36 PM EDTSpecial Weather StatementLWX54 min
Aug 14, 11:27 PM EDTFlash Flood WarningLWX77 min
Aug 18, 5:20 PM EDTSevere Thunderstorm WarningLWX40 min
Aug 18, 6:01 PM EDTFlash Flood WarningLWX81 min
Aug 18, 6:21 PM EDTSevere Thunderstorm WarningLWX39 min
Aug 18, 6:39 PM EDTMesoscale DiscussionSPC96 min
Aug 18, 6:49 PM EDTSevere Thunderstorm WarningLWX41 min
Aug 18, 11:16 PM EDTSpecial Weather StatementLWX29 min
Aug 18, 11:58 PM EDTSpecial Weather StatementLWX32 min
Aug 19, 3:13 PM EDTMesoscale DiscussionSPC62 min
Aug 21, 11:54 AM EDTMesoscale DiscussionSPC2 hr
Aug 21, 12:52 PM EDTSevere Thunderstorm WatchSPC8 hr
Aug 21, 1:20 PM EDTSpecial Weather StatementLWX25 min
Aug 21, 1:28 PM EDTSevere Thunderstorm WarningLWX47 min
Aug 21, 2:23 PM EDTSpecial Weather StatementLWX37 min
Aug 21, 7:12 PM EDTMesoscale DiscussionSPC63 min
Aug 21, 7:53 PM EDTSpecial Weather StatementLWX7 min
Aug 27, 5:26 PM EDTFlash Flood WarningLWX9 hr
Aug 27, 9:38 PM EDTFlash Flood WarningLWX6 hr
Aug 28, 1:58 AM EDTAreal Flood WarningLWX6 hr
Aug 28, 3:05 AM EDTAreal Flood WarningLWX6 hr
Sep 3, 9:21 AM EDTSpecial Weather StatementLWX24 min
Sep 5, 9:58 PM EDTSpecial Weather StatementLWX62 min
Sep 5, 10:04 PM EDTFlash Flood WarningLWX4 hr
Sep 5, 10:17 PM EDTFlash Flood WarningLWX2 hr
Sep 7, 11:33 AM EDTFlash Flood Warning EmergencyLWX10 hr
Sep 7, 11:46 AM EDTSpecial Weather StatementLWX44 min
Sep 7, 1:14 PM EDTFlash Flood WarningLWX3 hr
Sep 7, 5:25 PM EDTAreal Flood WarningLWX6 hr
Sep 7, 10:03 PM EDTFlash Flood WarningLWX6 hr
Sep 8, 4:02 AM EDTAreal Flood WarningLWX20 hr
Sep 8, 5:54 AM EDTFlash Flood WarningLWX3 hr
Sep 8, 6:25 PM EDTFlash Flood WarningLWX74 min
Sep 11, 2:48 PM EDTFlash Flood WarningLWX59 min
Sep 11, 2:53 PM EDTSpecial Weather StatementLWX37 min
Sep 11, 3:08 PM EDTSevere Thunderstorm WarningLWX22 min
Sep 11, 4:43 PM EDTSpecial Weather StatementLWX47 min
Sep 11, 5:02 PM EDTFlash Flood WarningLWX44 min
Sep 11, 6:38 PM EDTMesoscale DiscussionSPC97 min
Sep 14, 3:22 PM EDTMesoscale DiscussionSPC53 min
Sep 14, 8:46 PM EDTSpecial Weather StatementLWX44 min
Sep 23, 12:34 PM EDTFlash Flood WarningLWX3 hr
Sep 28, 8:12 PM EDTSpecial Weather StatementLWX33 min
Sep 28, 8:56 PM EDTSpecial Weather StatementLWX34 min
Oct 13, 4:28 PM EDTTornado WatchSPC4 hr
Oct 13, 6:53 PM EDTMesoscale DiscussionSPC97 min
Dec 7, 9:36 PM ESTAreal Flood WarningLWX4 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 archive20102012

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.