Alert archive / Maryland / Washington County

Weather alerts in Washington County, Maryland, 2012

230 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Washington County and its neighbors

Each county as a circle sized by its count in 2012. Tap one for its archive.

Alerts: 230
Warnings: 78
Watches: 39
Advisories: 43
Busiest month: July46 alerts
Busiest day: May 29, 201210 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 2 tornado warnings covering Washington County in 2012 had a tornado report inside them.

Washington County, 2012

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	0	100%	0
Severe thunderstorm warnings	48	41	15%	22	100%	18 min
Flash flood warnings	4	3	25%	2	100%	105 min

Each office's whole area, 2012

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Baltimore/Washington: tornado warnings	43	9	79%	18	61%	13 min
NWS Baltimore/Washington: severe thunderstorm warnings	365	286	22%	1,001	90%	26 min
NWS Baltimore/Washington: flash flood warnings	81	46	43%	156	78%	70 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.

Issued	Product	Office	Lasted
Jan 10, 5:22 AM EST	Dense Fog Advisory	LWX	4 hr
Jan 12, 1:51 PM EST	Wind Advisory	LWX	28 hr
Jan 19, 3:09 PM EST	Winter Storm Watch	LWX	22 hr
Jan 20, 1:00 PM EST	Winter Weather Advisory	LWX	24 hr
Jan 21, 3:39 AM EST	Winter Storm Warning	LWX	7 hr
Jan 22, 1:26 PM EST	Freezing Rain Advisory	LWX	22 hr
Jan 23, 8:06 AM EST	Dense Fog Advisory	LWX	4 hr
Jan 23, 11:04 AM EST	Freezing Rain Advisory	LWX	114 min
Jan 24, 1:01 AM EST	Dense Fog Advisory	LWX	9 hr
Feb 8, 3:27 AM EST	Winter Weather Advisory	LWX	17 hr
Feb 10, 1:56 PM EST	Winter Weather Advisory	LWX	29 hr
Feb 11, 12:38 PM EST	Wind Advisory	LWX	17 hr
Feb 23, 10:05 AM EST	Fire Weather Watch	LWX	18 hr
Feb 23, 1:40 PM EST	High Wind Watch	LWX	14 hr
Feb 24, 3:53 AM EST	High Wind Warning	LWX	14 hr
Feb 24, 3:53 AM EST	Wind Advisory	LWX	20 hr
Feb 25, 12:08 AM EST	Wind Advisory	LWX	3 hr
Feb 25, 2:52 AM EST	Wind Advisory	LWX	15 hr
Feb 29, 4:45 PM EST	Flood Watch	LWX	9 hr
Feb 29, 7:25 PM EST	Areal Flood Warning	LWX	3 hr
Mar 1, 2:27 AM EST	Dense Fog Advisory	LWX	6 hr
Mar 2, 11:53 AM EST	Flood Watch	LWX	18 hr
Mar 2, 9:41 PM EST	Areal Flood Warning	LWX	2 hr
Mar 17, 5:11 AM EDT	Dense Fog Advisory	LWX	3 hr
Mar 23, 4:05 AM EDT	Dense Fog Advisory	LWX	6 hr
Mar 25, 2:52 PM EDT	Freeze Watch	LWX	26 hr
Mar 26, 4:10 AM EDT	Freeze Warning	LWX	29 hr
Mar 28, 10:23 AM EDT	Mesoscale Discussion	SPC	2 hr
Mar 29, 1:58 PM EDT	Frost Advisory	LWX	19 hr
Apr 2, 12:01 PM EDT	Freeze Warning	LWX	20 hr
Apr 5, 4:31 AM EDT	Freeze Watch	LWX	23 hr
Apr 5, 11:32 AM EDT	Freeze Warning	LWX	21 hr
Apr 6, 3:54 AM EDT	Freeze Warning	LWX	28 hr
Apr 6, 2:25 PM EDT	Fire Weather Watch	LWX	14 hr
Apr 7, 4:14 AM EDT	Fire Weather Watch	LWX	17 hr
Apr 7, 4:14 AM EDT	Red Flag Warning	LWX	15 hr
Apr 7, 2:47 PM EDT	Freeze Warning	LWX	16 hr
Apr 7, 9:05 PM EDT	Red Flag Warning	LWX	23 hr
Apr 8, 3:28 AM EDT	Fire Weather Watch	LWX	22 hr
Apr 8, 8:19 PM EDT	Red Flag Warning	LWX	23 hr
Apr 9, 10:34 AM EDT	Fire Weather Watch	LWX	10 hr
Apr 9, 8:39 PM EDT	Red Flag Warning	LWX	27 hr
Apr 10, 3:54 PM EDT	Freeze Watch	LWX	22 hr
Apr 12, 2:54 PM EDT	Frost Advisory	LWX	16 hr
Apr 24, 8:01 PM EDT	Frost Advisory	LWX	12 hr
Apr 27, 10:03 AM EDT	Freeze Watch	LWX	4 hr
Apr 27, 1:55 PM EDT	Freeze Warning	LWX	19 hr
Apr 29, 8:21 AM EDT	Dense Fog Advisory	LWX	2 hr
May 2, 4:56 PM EDT	Mesoscale Discussion	SPC	2 hr
May 2, 5:26 PM EDT	Special Weather Statement	LWX	34 min
May 2, 5:41 PM EDT	Special Weather Statement	LWX	34 min
May 2, 6:06 PM EDT	Severe Thunderstorm Warning	LWX	39 min
May 3, 5:45 PM EDT	Mesoscale Discussion	SPC	60 min
May 3, 7:17 PM EDT	Special Weather Statement	LWX	28 min
May 3, 7:31 PM EDT	Special Weather Statement	LWX	29 min
May 3, 7:34 PM EDT	Severe Thunderstorm Warning	LWX	41 min
May 3, 7:56 PM EDT	Severe Thunderstorm Warning	LWX	49 min
May 3, 8:28 PM EDT	Severe Thunderstorm Warning	LWX	26 min
May 3, 8:46 PM EDT	Special Weather Statement	LWX	29 min
May 3, 8:58 PM EDT	Special Weather Statement	LWX	32 min
May 3, 9:44 PM EDT	Special Weather Statement	LWX	46 min
May 4, 1:26 PM EDT	Mesoscale Discussion	SPC	2 hr
May 21, 11:17 PM EDT	Special Weather Statement	LWX	88 min
May 26, 7:17 PM EDT	Severe Thunderstorm Warning	LWX	43 min
May 27, 1:41 PM EDT	Mesoscale Discussion	SPC	64 min
May 27, 6:34 PM EDT	Mesoscale Discussion	SPC	56 min
May 27, 7:03 PM EDT	Special Weather Statement	LWX	57 min
May 27, 7:25 PM EDT	Severe Thunderstorm Warning	LWX	50 min
May 27, 8:08 PM EDT	Severe Thunderstorm Warning	LWX	37 min
May 29, 3:22 PM EDT	Special Weather Statement	LWX	53 min
May 29, 3:58 PM EDT	Severe Thunderstorm Warning	LWX	47 min
May 29, 4:22 PM EDT	Mesoscale Discussion	SPC	53 min
May 29, 4:33 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
May 29, 4:53 PM EDT	Severe Thunderstorm Warning	LWX	52 min
May 29, 5:01 PM EDT	Severe Thunderstorm Warning	LWX	44 min
May 29, 5:26 PM EDT	Severe Thunderstorm Warning	LWX	49 min
May 29, 5:37 PM EDT	Special Weather Statement	LWX	38 min
May 29, 5:45 PM EDT	Flash Flood Warning	LWX	5 hr
May 29, 5:50 PM EDT	Severe Thunderstorm Warning	LWX	40 min
Jun 1, 12:29 PM EDT	Mesoscale Discussion	SPC	61 min
Jun 1, 1:03 PM EDT	Mesoscale Discussion	SPC	87 min
Jun 1, 1:28 PM EDT	Tornado Watch	SPC	8 hr
Jun 1, 3:35 PM EDT	Mesoscale Discussion	SPC	55 min
Jun 1, 3:40 PM EDT	Flash Flood Watch	LWX	8 hr
Jun 1, 6:29 PM EDT	Severe Thunderstorm Warning	LWX	46 min
Jun 1, 7:20 PM EDT	Severe Thunderstorm Warning	LWX	40 min
Jun 3, 1:37 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 3, 6:20 PM EDT	Special Weather Statement	LWX	25 min
Jun 7, 3:53 PM EDT	Severe Thunderstorm Warning	LWX	23 min
Jun 19, 1:57 PM EDT	Heat Advisory	LWX	51 hr
Jun 22, 12:18 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 22, 2:12 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 22, 4:05 PM EDT	Special Weather Statement	LWX	40 min
Jun 22, 4:08 PM EDT	Severe Thunderstorm Warning	LWX	52 min
Jun 22, 4:39 PM EDT	Severe Thunderstorm Warning	LWX	51 min
Jun 22, 4:48 PM EDT	Severe Thunderstorm Warning	LWX	42 min
Jun 22, 6:42 PM EDT	Mesoscale Discussion	SPC	63 min
Jun 28, 2:46 PM EDT	Heat Advisory	LWX	30 hr
Jun 29, 4:20 AM EDT	Severe Thunderstorm Warning	LWX	40 min
Jun 29, 6:03 PM EDT	Mesoscale Discussion	SPC	87 min
Jun 29, 6:34 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 29, 7:51 PM EDT	Mesoscale Discussion	SPC	114 min
Jun 29, 8:53 PM EDT	Severe Thunderstorm Warning	LWX	35 min
Jun 29, 9:08 PM EDT	Severe Thunderstorm Warning	LWX	67 min
Jun 29, 9:14 PM EDT	Tornado Warning	LWX	19 min
Jun 29, 9:34 PM EDT	Severe Thunderstorm Warning	LWX	56 min
Jun 30, 4:19 AM EDT	Heat Advisory	LWX	14 hr
Jul 1, 9:06 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jul 3, 5:51 PM EDT	Special Weather Statement	LWX	24 min
Jul 3, 5:58 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 3, 6:07 PM EDT	Severe Thunderstorm Warning	LWX	38 min
Jul 3, 6:43 PM EDT	Severe Thunderstorm Warning	LWX	18 min
Jul 4, 3:12 PM EDT	Special Weather Statement	LWX	3 hr
Jul 4, 7:56 PM EDT	Severe Thunderstorm Warning	LWX	49 min
Jul 4, 8:05 PM EDT	Mesoscale Discussion	SPC	55 min
Jul 4, 8:20 PM EDT	Severe Thunderstorm Warning	LWX	40 min
Jul 4, 8:53 PM EDT	Severe Thunderstorm Warning	LWX	52 min
Jul 5, 4:37 PM EDT	Mesoscale Discussion	SPC	113 min
Jul 5, 9:20 PM EDT	Excessive Heat Watch	LWX	16 hr
Jul 6, 1:49 PM EDT	Excessive Heat Warning	LWX	32 hr
Jul 6, 1:49 PM EDT	Heat Advisory	LWX	32 hr
Jul 7, 5:43 PM EDT	Mesoscale Discussion	SPC	62 min
Jul 7, 6:14 PM EDT	Severe Thunderstorm Watch	SPC	3 hr
Jul 8, 1:30 PM EDT	Severe Thunderstorm Warning	LWX	45 min
Jul 8, 1:44 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 8, 2:17 PM EDT	Severe Thunderstorm Warning	LWX	43 min
Jul 8, 3:14 PM EDT	Severe Thunderstorm Warning	LWX	34 min
Jul 8, 3:49 PM EDT	Special Weather Statement	LWX	26 min
Jul 18, 12:41 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 18, 2:04 PM EDT	Severe Thunderstorm Warning	LWX	41 min
Jul 18, 2:50 PM EDT	Severe Thunderstorm Warning	LWX	40 min
Jul 18, 2:57 PM EDT	Severe Thunderstorm Warning	LWX	48 min
Jul 18, 3:24 PM EDT	Severe Thunderstorm Warning	LWX	30 min
Jul 18, 3:44 PM EDT	Mesoscale Discussion	SPC	91 min
Jul 19, 6:00 PM EDT	Special Weather Statement	LWX	30 min
Jul 19, 6:17 PM EDT	Special Weather Statement	LWX	28 min
Jul 19, 6:32 PM EDT	Severe Thunderstorm Warning	LWX	43 min
Jul 19, 6:53 PM EDT	Mesoscale Discussion	SPC	97 min
Jul 19, 7:29 PM EDT	Special Weather Statement	LWX	46 min
Jul 20, 4:26 AM EDT	Flash Flood Watch	LWX	17 hr
Jul 24, 9:48 AM EDT	Special Weather Statement	LWX	27 min
Jul 24, 11:48 AM EDT	Mesoscale Discussion	SPC	87 min
Jul 24, 1:08 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 25, 2:08 PM EDT	Heat Advisory	LWX	30 hr
Jul 26, 3:37 PM EDT	Mesoscale Discussion	SPC	113 min
Jul 26, 5:54 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 26, 7:57 PM EDT	Severe Thunderstorm Warning	LWX	48 min
Jul 26, 8:52 PM EDT	Special Weather Statement	LWX	38 min
Jul 28, 1:36 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 28, 3:13 PM EDT	Special Weather Statement	LWX	27 min
Jul 28, 4:03 PM EDT	Special Weather Statement	LWX	27 min
Jul 28, 4:18 PM EDT	Mesoscale Discussion	SPC	87 min
Jul 31, 5:00 PM EDT	Special Weather Statement	LWX	30 min
Jul 31, 10:04 PM EDT	Special Weather Statement	LWX	56 min
Aug 1, 4:31 PM EDT	Special Weather Statement	LWX	29 min
Aug 5, 2:34 PM EDT	Special Weather Statement	LWX	26 min
Aug 5, 2:49 PM EDT	Mesoscale Discussion	SPC	86 min
Aug 9, 4:27 PM EDT	Severe Thunderstorm Warning	LWX	48 min
Aug 9, 5:32 PM EDT	Special Weather Statement	LWX	43 min
Aug 10, 3:31 PM EDT	Mesoscale Discussion	SPC	89 min
Aug 10, 4:38 PM EDT	Special Weather Statement	LWX	52 min
Aug 10, 4:51 PM EDT	Severe Thunderstorm Warning	LWX	39 min
Aug 10, 5:25 PM EDT	Severe Thunderstorm Warning	LWX	50 min
Aug 10, 7:31 PM EDT	Mesoscale Discussion	SPC	119 min
Aug 14, 2:07 PM EDT	Mesoscale Discussion	SPC	113 min
Aug 14, 4:34 PM EDT	Severe Thunderstorm Warning	LWX	41 min
Aug 21, 7:19 AM EDT	Dense Fog Advisory	LWX	101 min
Aug 26, 12:52 PM EDT	Mesoscale Discussion	SPC	83 min
Aug 26, 1:38 PM EDT	Special Weather Statement	LWX	37 min
Aug 26, 2:42 PM EDT	Flash Flood Watch	LWX	7 hr
Sep 1, 3:54 PM EDT	Severe Thunderstorm Warning	LWX	51 min
Sep 1, 4:17 PM EDT	Special Weather Statement	LWX	58 min
Sep 1, 6:13 PM EDT	Flash Flood Warning	LWX	2 hr
Sep 4, 2:35 PM EDT	Special Weather Statement	LWX	25 min
Sep 8, 11:38 AM EDT	Mesoscale Discussion	SPC	97 min
Sep 8, 12:02 PM EDT	Severe Thunderstorm Warning	LWX	43 min
Sep 8, 12:15 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Sep 8, 12:22 PM EDT	Special Weather Statement	LWX	23 min
Sep 8, 12:35 PM EDT	Severe Thunderstorm Warning	LWX	40 min
Sep 8, 12:47 PM EDT	Tornado Warning	LWX	16 min
Sep 8, 1:09 PM EDT	Severe Thunderstorm Warning	LWX	66 min
Sep 18, 8:49 AM EDT	Mesoscale Discussion	SPC	116 min
Sep 18, 10:20 AM EDT	Special Weather Statement	LWX	40 min
Sep 18, 10:54 AM EDT	Tornado Watch	SPC	9 hr
Sep 18, 11:13 AM EDT	Severe Thunderstorm Warning	LWX	47 min
Sep 18, 12:29 PM EDT	Severe Thunderstorm Warning	LWX	61 min
Sep 18, 12:39 PM EDT	Flash Flood Warning	LWX	4 hr
Sep 18, 1:56 PM EDT	Flash Flood Watch	LWX	4 hr
Sep 27, 3:18 PM EDT	Mesoscale Discussion	SPC	117 min
Sep 30, 4:07 PM EDT	Special Weather Statement	LWX	23 min
Oct 1, 1:55 AM EDT	Dense Fog Advisory	LWX	8 hr
Oct 3, 2:41 AM EDT	Dense Fog Advisory	LWX	7 hr
Oct 11, 2:26 PM EDT	Freeze Watch	LWX	24 hr
Oct 12, 2:00 PM EDT	Freeze Warning	LWX	19 hr
Oct 18, 9:52 PM EDT	Special Weather Statement	LWX	38 min
Oct 18, 9:55 PM EDT	Severe Thunderstorm Warning	LWX	30 min
Oct 18, 10:08 PM EDT	Special Weather Statement	LWX	37 min
Oct 18, 10:27 PM EDT	Severe Thunderstorm Warning	LWX	37 min
Oct 27, 4:39 AM EDT	Flood Watch	LWX	61 hr
Oct 27, 5:02 PM EDT	High Wind Watch	LWX	12 hr
Oct 28, 4:34 AM EDT	High Wind Warning	LWX	48 hr
Oct 29, 11:16 AM EDT	River Flood Warning	LWX	56 hr
Oct 29, 11:29 AM EDT	River Flood Warning	LWX	44 hr
Oct 29, 12:00 PM EDT	River Flood Watch	LWX	6 hr
Oct 29, 12:00 PM EDT	River Flood Watch	LWX	6 hr
Oct 29, 12:00 PM EDT	River Flood Watch	LWX	6 hr
Oct 29, 12:39 PM EDT	Flash Flood Warning	LWX	3 hr
Oct 29, 4:38 PM EDT	Areal Flood Warning	LWX	26 hr
Oct 29, 5:06 PM EDT	River Flood Warning	LWX	5 hr
Oct 29, 5:06 PM EDT	River Flood Warning	LWX	15 hr
Oct 29, 5:06 PM EDT	River Flood Warning	LWX	40 hr
Oct 30, 4:13 AM EDT	Wind Advisory	LWX	6 hr
Nov 21, 7:24 AM EST	Dense Fog Advisory	LWX	3 hr
Nov 26, 9:33 PM EST	Winter Weather Advisory	LWX	12 hr
Dec 1, 9:57 PM EST	Dense Fog Advisory	LWX	12 hr
Dec 8, 4:13 AM EST	Dense Fog Advisory	LWX	5 hr
Dec 9, 7:10 PM EST	Dense Fog Advisory	LWX	14 hr
Dec 16, 8:42 PM EST	Dense Fog Advisory	LWX	13 hr
Dec 18, 5:18 AM EST	Dense Fog Advisory	LWX	3 hr
Dec 20, 2:11 PM EST	High Wind Watch	LWX	23 hr
Dec 20, 2:11 PM EST	Wind Advisory	LWX	50 hr
Dec 22, 2:42 AM EST	High Wind Warning	LWX	14 hr
Dec 23, 8:50 PM EST	Winter Weather Advisory	LWX	31 hr
Dec 24, 3:50 PM EST	Winter Storm Watch	LWX	23 hr
Dec 25, 1:13 AM EST	Dense Fog Advisory	LWX	11 hr
Dec 25, 2:29 PM EST	Winter Weather Advisory	LWX	35 hr
Dec 26, 12:48 PM EST	Mesoscale Discussion	SPC	6 hr
Dec 26, 1:40 PM EST	Wind Advisory	LWX	27 hr
Dec 28, 4:30 AM EST	Winter Weather Advisory	LWX	51 hr
Dec 30, 9:31 AM EST	Wind Advisory	LWX	5 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

Product	Alerts
Severe storms
Severe Thunderstorm Warning	48
Tornado Warning	2
Severe Thunderstorm Watch	11
Tornado Watch	2
Mesoscale Discussion	33
Special Weather Statement	37
Flooding
Areal Flood Warning	3
Flash Flood Warning	4
River Flood Warning	5
Flash Flood Watch	4
Flood Watch	3
River Flood Watch	3
Winter
Winter Storm Warning	1
Winter Storm Watch	2
Freezing Rain Advisory	2
Winter Weather Advisory	7
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	5
Cold
Freeze Warning	7
Freeze Watch	5
Frost Advisory	3
Wind and dust
High Wind Warning	3
High Wind Watch	3
Wind Advisory	9
Fire
Red Flag Warning	4
Fire Weather Watch	5
Fog and smoke
Dense Fog Advisory	17

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2011 2013

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.