Alert archive / Maryland / Howard County

Weather alerts in Howard County, Maryland, 2010

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

Alerts
149
Warnings
52
Watches
21
Advisories
0
Busiest month
July27 alerts
Busiest day
July 25, 201010 alerts

Over time

By month

Warning verification

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

1 of 5 tornado warnings covering Howard County in 2010 had a tornado report inside them.

Howard County, 2010

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings5180%0
Severe thunderstorm warnings33309%667%20 min
Flash flood warnings11736%2100%283 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
Feb 5, 11:45 AM ESTMesoscale DiscussionSPC4 hr
Feb 5, 6:58 PM ESTMesoscale DiscussionSPC4 hr
Feb 6, 6:53 AM ESTMesoscale DiscussionSPC4 hr
Feb 6, 12:03 PM ESTMesoscale DiscussionSPC4 hr
Feb 9, 7:04 PM ESTMesoscale DiscussionSPC4 hr
Feb 10, 7:27 AM ESTMesoscale DiscussionSPC5 hr
Feb 10, 12:20 PM ESTMesoscale DiscussionSPC4 hr
Mar 13, 11:23 AM ESTAreal Flood WarningLWX10 hr
Mar 13, 2:17 PM ESTAreal Flood WarningLWX6 hr
Mar 14, 4:40 AM EDTAreal Flood WarningLWX4 hr
Apr 8, 8:00 PM EDTSpecial Weather StatementLWX60 min
Apr 8, 8:12 PM EDTSevere Thunderstorm WarningLWX31 min
Apr 16, 4:17 PM EDTSpecial Weather StatementLWX58 min
Apr 16, 4:28 PM EDTSevere Thunderstorm WarningLWX32 min
Apr 16, 4:55 PM EDTSevere Thunderstorm WarningLWX50 min
Apr 16, 6:16 PM EDTSpecial Weather StatementLWX74 min
Apr 16, 6:20 PM EDTSpecial Weather StatementLWX70 min
Apr 16, 8:05 PM EDTSpecial Weather StatementLWX70 min
Apr 25, 10:56 AM EDTMesoscale DiscussionSPC2 hr
Apr 25, 4:37 PM EDTSevere Thunderstorm WatchSPC6 hr
Apr 25, 6:16 PM EDTMesoscale DiscussionSPC89 min
Apr 25, 7:04 PM EDTSevere Thunderstorm WarningLWX41 min
Apr 25, 7:31 PM EDTSevere Thunderstorm WarningLWX44 min
Apr 25, 7:54 PM EDTSevere Thunderstorm WarningLWX51 min
Apr 25, 8:05 PM EDTSevere Thunderstorm WarningLWX40 min
Apr 25, 8:36 PM EDTSevere Thunderstorm WarningLWX39 min
Apr 25, 8:53 PM EDTMesoscale DiscussionSPC2 hr
Apr 25, 9:59 PM EDTFlash Flood WarningLWX46 min
Apr 25, 10:04 PM EDTSpecial Weather StatementLWX26 min
May 2, 4:45 PM EDTMesoscale DiscussionSPC60 min
May 2, 5:58 PM EDTSevere Thunderstorm WatchSPC5 hr
May 2, 8:27 PM EDTMesoscale DiscussionSPC63 min
May 12, 5:00 PM EDTSpecial Weather StatementLWX30 min
May 12, 5:26 PM EDTSpecial Weather StatementLWX34 min
May 14, 11:56 AM EDTMesoscale DiscussionSPC2 hr
May 14, 2:29 PM EDTSevere Thunderstorm WatchSPC7 hr
May 14, 6:35 PM EDTMesoscale DiscussionSPC55 min
May 27, 11:28 AM EDTMesoscale DiscussionSPC92 min
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 27, 11:45 PM EDTSpecial Weather StatementLWX60 min
May 28, 1:02 AM EDTSpecial Weather StatementLWX43 min
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, 4:23 PM EDTSevere Thunderstorm WarningLWX52 min
Jun 3, 5:01 PM EDTSevere Thunderstorm WarningLWX44 min
Jun 3, 6:28 PM EDTMesoscale DiscussionSPC62 min
Jun 4, 1:09 PM EDTMesoscale DiscussionSPC66 min
Jun 4, 2:39 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 4, 4:24 PM EDTMesoscale DiscussionSPC66 min
Jun 4, 5:30 PM EDTSpecial Weather StatementLWX30 min
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, 1:43 PM EDTSevere Thunderstorm WarningLWX47 min
Jun 12, 2:47 PM EDTMesoscale DiscussionSPC88 min
Jun 12, 4:16 PM EDTMesoscale DiscussionSPC89 min
Jun 22, 11:35 AM EDTMesoscale DiscussionSPC25 min
Jun 22, 3:48 PM EDTMesoscale DiscussionSPC27 min
Jun 22, 7:32 PM EDTSevere Thunderstorm WarningLWX43 min
Jun 22, 7:32 PM EDTSevere Thunderstorm WarningLWX43 min
Jun 24, 12:16 PM EDTMesoscale DiscussionSPC89 min
Jun 24, 12:28 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 24, 2:34 PM EDTMesoscale DiscussionSPC116 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 12, 2:52 PM EDTSevere Thunderstorm WarningLWX38 min
Jul 12, 3:30 PM EDTSpecial Weather StatementLWX30 min
Jul 13, 6:02 PM EDTMesoscale DiscussionSPC58 min
Jul 14, 12:38 AM EDTFlash Flood WarningLWX3 hr
Jul 18, 11:31 PM EDTSevere Thunderstorm WarningLWX44 min
Jul 20, 4:33 PM EDTSpecial Weather StatementLWX42 min
Jul 20, 4:44 PM EDTSevere Thunderstorm WarningLWX46 min
Jul 20, 4:59 PM EDTTornado WarningLWX31 min
Jul 25, 10:48 AM EDTMesoscale DiscussionSPC27 min
Jul 25, 12:50 PM EDTMesoscale DiscussionSPC55 min
Jul 25, 1:21 PM EDTMesoscale DiscussionSPC54 min
Jul 25, 1:46 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 25, 2:29 PM EDTSevere Thunderstorm WarningLWX61 min
Jul 25, 2:36 PM EDTSevere Thunderstorm WarningLWX54 min
Jul 25, 3:07 PM EDTSevere Thunderstorm WarningLWX38 min
Jul 25, 3:18 PM EDTTornado WarningLWX27 min
Jul 25, 3:25 PM EDTMesoscale DiscussionSPC65 min
Jul 25, 3:42 PM EDTSevere Thunderstorm WarningLWX63 min
Jul 29, 11:36 AM EDTMesoscale DiscussionSPC54 min
Jul 29, 11:54 AM EDTSevere Thunderstorm WatchSPC7 hr
Jul 29, 12:31 PM EDTSevere Thunderstorm WarningLWX44 min
Jul 29, 12:53 PM EDTSpecial Weather StatementLWX37 min
Jul 29, 1:10 PM EDTSevere Thunderstorm WarningLWX50 min
Jul 29, 3:41 PM EDTSpecial Weather StatementLWX34 min
Jul 29, 3:58 PM EDTSevere Thunderstorm WarningLWX25 min
Jul 29, 4:20 PM EDTMesoscale DiscussionSPC55 min
Jul 29, 4:29 PM EDTSpecial Weather StatementLWX31 min
Aug 4, 5:30 PM EDTMesoscale DiscussionSPC30 min
Aug 4, 5:52 PM EDTSevere Thunderstorm WatchSPC5 hr
Aug 4, 7:48 PM EDTMesoscale DiscussionSPC87 min
Aug 4, 7:53 PM EDTSpecial Weather StatementLWX37 min
Aug 4, 8:35 PM EDTSpecial Weather StatementLWX40 min
Aug 5, 12:37 PM EDTMesoscale DiscussionSPC53 min
Aug 5, 1:19 PM EDTSevere Thunderstorm WatchSPC9 hr
Aug 5, 3:56 PM EDTMesoscale DiscussionSPC64 min
Aug 5, 6:23 PM EDTMesoscale DiscussionSPC97 min
Aug 12, 6:10 AM EDTSevere Thunderstorm WarningLWX35 min
Aug 12, 6:28 AM EDTSevere Thunderstorm WarningLWX32 min
Aug 12, 7:01 AM EDTMesoscale DiscussionSPC119 min
Aug 12, 1:52 PM EDTMesoscale DiscussionSPC83 min
Aug 12, 2:51 PM EDTSevere Thunderstorm WatchSPC5 hr
Aug 12, 4:48 PM EDTTornado WarningLWX27 min
Aug 12, 5:13 PM EDTSevere Thunderstorm WarningLWX62 min
Aug 12, 5:17 PM EDTTornado WarningLWX43 min
Aug 12, 5:49 PM EDTFlash Flood WarningLWX115 min
Aug 12, 10:40 PM EDTFlash Flood WarningLWX2 hr
Aug 16, 2:01 PM EDTMesoscale DiscussionSPC89 min
Aug 16, 2:13 PM EDTSevere Thunderstorm WatchSPC6 hr
Sep 22, 2:31 PM EDTMesoscale DiscussionSPC59 min
Sep 22, 2:45 PM EDTSevere Thunderstorm WatchSPC7 hr
Sep 22, 7:31 PM EDTSevere Thunderstorm WarningLWX44 min
Sep 27, 12:03 PM EDTSpecial Weather StatementLWX42 min
Sep 27, 12:12 PM EDTTornado WarningLWX33 min
Sep 27, 1:03 PM EDTMesoscale DiscussionSPC87 min
Sep 27, 1:12 PM EDTSpecial Weather StatementLWX48 min
Sep 27, 1:21 PM EDTFlash Flood WarningLWX3 hr
Sep 27, 1:38 PM EDTFlash Flood WarningLWX3 hr
Sep 30, 4:55 AM EDTTornado WatchSPC8 hr
Sep 30, 6:39 AM EDTFlash Flood WarningLWX6 hr
Sep 30, 8:25 AM EDTMesoscale DiscussionSPC95 min
Sep 30, 10:38 AM EDTFlash Flood WarningLWX6 hr
Sep 30, 10:49 AM EDTSevere Thunderstorm WarningLWX26 min
Sep 30, 10:49 AM EDTMesoscale DiscussionSPC116 min
Sep 30, 12:22 PM EDTFlash Flood WarningLWX6 hr
Sep 30, 4:40 PM EDTFlash Flood WarningLWX11 hr
Sep 30, 6:13 PM EDTFlash Flood WarningLWX6 hr
Oct 26, 7:19 PM EDTTornado WatchSPC12 hr
Oct 26, 11:05 PM EDTMesoscale DiscussionSPC55 min
Oct 27, 12:24 AM EDTMesoscale DiscussionSPC66 min
Oct 27, 11:54 AM EDTMesoscale DiscussionSPC66 min
Oct 27, 12:13 PM EDTTornado WatchSPC8 hr
Nov 16, 11:52 PM ESTSpecial Weather StatementLWX23 min
Nov 16, 11:59 PM ESTSevere Thunderstorm WarningLWX46 min
Nov 17, 12:06 AM ESTSevere Thunderstorm WatchSPC4 hr
Nov 17, 12:35 AM ESTSevere Thunderstorm WarningLWX40 min
Nov 17, 1:04 AM ESTSevere Thunderstorm WarningLWX86 min
Dec 1, 3:48 AM ESTTornado WatchSPC7 hr
Dec 1, 7:51 AM ESTMesoscale DiscussionSPC84 min
Dec 1, 8:03 AM ESTSevere Thunderstorm WarningLWX42 min
Dec 1, 9:00 AM ESTSevere Thunderstorm WarningLWX75 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 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.