Weather alerts in Maryland, December 2009

91 weather alerts in December 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.

Weather alerts by county

Each county as a circle sized by its count in December 2009. Tap one for its archive.

Alerts: 91
Warnings: 24
Watches: 15
Advisories: 44
Busiest day: December 26, 200910 alerts

Over time

By day

Days in UTC, the clock the archive keeps.

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	Counties	Lasted
Dec 2, 2:25 AM EST	Wind Advisory	PBZ		32 hr
Dec 2, 4:00 AM EST	Wind Advisory	LWX	Allegany	18 hr
Dec 2, 4:33 AM EST	High Surf Advisory	AKQ	Worcester	21 hr
Dec 2, 4:40 AM EST	Wind Advisory	AKQ	Worcester	16 hr
Dec 2, 1:38 PM EST	Flood Watch	LWX	Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 4 more	14 hr
Dec 2, 9:01 PM EST	Tornado Watch	SPC	Worcester	6 hr
Dec 3, 12:12 AM EST	Mesoscale Discussion	SPC	Calvert, Caroline, Dorchester, Saint Mary's, Somerset, Talbot and 2 more	93 min
Dec 4, 2:17 PM EST	Winter Weather Advisory	LWX	Allegany, Anne Arundel, Baltimore, Carroll, Charles, Frederick and 3 more	30 hr
Dec 4, 7:57 PM EST	Winter Weather Advisory	PBZ		21 hr
Dec 4, 11:07 PM EST	Winter Storm Warning	LWX	Allegany	18 hr
Dec 5, 3:25 AM EST	Winter Weather Advisory	PHI	Cecil, Kent, Queen Anne's	19 hr
Dec 5, 11:52 AM EST	Winter Storm Warning	PBZ		5 hr
Dec 7, 2:16 PM EST	Winter Storm Watch	LWX	Allegany, Carroll, Frederick, Washington	24 hr
Dec 7, 2:41 PM EST	Winter Storm Watch	PBZ		24 hr
Dec 8, 7:57 AM EST	Flood Watch	AKQ	Dorchester, Somerset, Wicomico, Worcester	23 hr
Dec 8, 9:50 AM EST	Winter Storm Warning	LWX	Allegany	21 hr
Dec 8, 10:09 AM EST	Flood Watch	LWX	Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 4 more	21 hr
Dec 8, 1:14 PM EST	Mesoscale Discussion	SPC	Garrett	5 hr
Dec 8, 2:30 PM EST	Winter Weather Advisory	LWX	Baltimore, Carroll, Frederick, Washington	17 hr
Dec 8, 2:35 PM EST	Winter Storm Warning	PBZ		15 hr
Dec 8, 2:40 PM EST	Flash Flood Watch	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	21 hr
Dec 8, 2:42 PM EST	Wind Advisory	PBZ		22 hr
Dec 9, 4:02 AM EST	Wind Advisory	LWX	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 5 more	17 hr
Dec 9, 6:53 AM EST	Areal Flood Warning	PHI	Cecil	8 hr
Dec 9, 7:08 AM EST	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	4 hr
Dec 9, 9:20 AM EST	Coastal Flood Advisory	LWX	Anne Arundel, Baltimore, Calvert, Charles, Prince George's, Saint Mary's and 1 more	20 hr
Dec 9, 12:00 PM EST	Wind Advisory	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	33 hr
Dec 9, 1:00 PM EST	High Wind Warning	PBZ		8 hr
Dec 9, 2:07 PM EST	High Wind Warning	LWX	Allegany	5 hr
Dec 9, 2:55 PM EST	Areal Flood Warning	PHI	Cecil	7 hr
Dec 9, 3:08 PM EST	Wind Advisory	AKQ	Worcester	6 hr
Dec 10, 2:41 PM EST	Wind Chill Advisory	PBZ		18 hr
Dec 10, 3:00 PM EST	Wind Chill Advisory	LWX	Allegany	18 hr
Dec 12, 2:48 PM EST	Winter Weather Advisory	PBZ		22 hr
Dec 12, 3:21 PM EST	Winter Weather Advisory	LWX	Allegany, Baltimore, Carroll, Frederick, Washington, City of Baltimore	23 hr
Dec 13, 7:55 PM EST	Dense Fog Advisory	LWX	Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 4 more	13 hr
Dec 13, 10:24 PM EST	Dense Fog Advisory	AKQ	Dorchester, Somerset, Wicomico, Worcester	12 hr
Dec 17, 1:48 PM EST	Winter Storm Watch	LWX	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 5 more	14 hr
Dec 17, 2:10 PM EST	Winter Storm Watch	PBZ		13 hr
Dec 17, 3:21 PM EST	Coastal Flood Watch	AKQ	Worcester	24 hr
Dec 17, 3:30 PM EST	Winter Storm Watch	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	22 hr
Dec 17, 3:53 PM EST	Winter Storm Watch	AKQ	Dorchester, Somerset, Wicomico, Worcester	20 hr
Dec 18, 3:06 AM EST	Winter Storm Warning	PBZ		48 hr
Dec 18, 4:03 AM EST	High Surf Advisory	AKQ	Worcester	58 hr
Dec 18, 4:05 AM EST	Winter Storm Warning	LWX	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 5 more	47 hr
Dec 18, 4:08 AM EST	Winter Storm Warning	AKQ	Dorchester, Somerset, Wicomico	48 hr
Dec 18, 4:40 AM EST	Winter Storm Warning	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	46 hr
Dec 18, 12:13 PM EST	Winter Weather Advisory	AKQ	Worcester	40 hr
Dec 18, 3:05 PM EST	Coastal Flood Warning	AKQ	Worcester	24 hr
Dec 18, 7:22 PM EST	Mesoscale Discussion	SPC	Calvert, Charles, Prince George's, Saint Mary's	5 hr
Dec 18, 11:06 PM EST	Blizzard Warning	LWX	Anne Arundel, Baltimore, Calvert, Charles, Prince George's, Saint Mary's and 1 more	16 hr
Dec 18, 11:06 PM EST	Winter Storm Warning	LWX	Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's	23 hr
Dec 19, 12:34 AM EST	Mesoscale Discussion	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Caroline, Carroll and 14 more	5 hr
Dec 19, 6:57 AM EST	Mesoscale Discussion	SPC	Allegany, Anne Arundel, Baltimore, Calvert, Caroline, Carroll and 15 more	6 hr
Dec 19, 10:47 AM EST	Coastal Flood Advisory	LWX	Calvert, Charles, Saint Mary's	8 hr
Dec 19, 11:09 AM EST	Coastal Flood Advisory	AKQ	Dorchester, Somerset, Wicomico	8 hr
Dec 19, 12:27 PM EST	Mesoscale Discussion	SPC	Anne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 11 more	6 hr
Dec 20, 3:24 AM EST	Coastal Flood Advisory	AKQ	Worcester	11 hr
Dec 23, 2:46 PM EST	Winter Storm Watch	LWX	Allegany, Washington	24 hr
Dec 23, 3:45 PM EST	Winter Storm Watch	PBZ		23 hr
Dec 24, 2:20 PM EST	Winter Weather Advisory	PBZ		22 hr
Dec 24, 2:29 PM EST	Winter Weather Advisory	LWX	Allegany, Baltimore, Carroll, Frederick, Washington	31 hr
Dec 24, 2:30 PM EST	Flood Watch	LWX	Anne Arundel, Baltimore, Calvert, Carroll, Charles, Frederick and 3 more	36 hr
Dec 25, 2:51 AM EST	Wind Advisory	PBZ		17 hr
Dec 25, 4:32 AM EST	Wind Advisory	LWX	Allegany	13 hr
Dec 25, 7:14 AM EST	Winter Storm Warning	PBZ		9 hr
Dec 25, 7:50 AM EST	Mesoscale Discussion	SPC	Allegany	4 hr
Dec 25, 4:14 PM EST	Dense Fog Advisory	LWX	Allegany, Anne Arundel, Baltimore, Carroll, Frederick, Prince George's and 2 more	4 hr
Dec 25, 4:55 PM EST	Areal Flood Warning	LWX	Calvert, Saint Mary's	3 hr
Dec 25, 7:16 PM EST	Areal Flood Warning	LWX	Montgomery	98 min
Dec 25, 8:14 PM EST	Areal Flood Warning	LWX	Anne Arundel, Baltimore, Harford, Howard, City of Baltimore	91 min
Dec 26, 2:18 AM EST	Coastal Flood Advisory	LWX	Anne Arundel, Baltimore, Calvert, Charles, Prince George's, Saint Mary's and 1 more	10 hr
Dec 26, 7:34 AM EST	River Flood Warning	LWX	Montgomery	6 days
Dec 26, 7:42 AM EST	Coastal Flood Advisory	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	15 hr
Dec 26, 8:00 AM EST	Areal Flood Warning	LWX	Anne Arundel, Baltimore, Carroll, Frederick, Howard, Montgomery and 2 more	6 hr
Dec 26, 8:56 AM EST	Coastal Flood Advisory	AKQ	Dorchester, Somerset	7 hr
Dec 26, 9:14 AM EST	Coastal Flood Warning	LWX	Anne Arundel, Baltimore, Calvert, Charles, Prince George's, Saint Mary's and 1 more	9 hr
Dec 26, 10:21 AM EST	River Flood Warning	LWX	Frederick	34 hr
Dec 26, 5:47 PM EST	Coastal Flood Advisory	LWX	Anne Arundel, Baltimore, Calvert, Charles, Prince George's, Saint Mary's and 1 more	11 hr
Dec 26, 9:08 PM EST	River Flood Warning	LWX	Washington	6 days
Dec 27, 1:12 AM EST	Dense Fog Advisory	LWX	Allegany, Washington	8 hr
Dec 27, 3:16 PM EST	Winter Weather Advisory	LWX	Allegany	39 hr
Dec 27, 3:49 PM EST	Winter Weather Advisory	PBZ		43 hr
Dec 28, 1:42 PM EST	Wind Advisory	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	27 hr
Dec 28, 2:48 PM EST	Wind Advisory	LWX	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 5 more	23 hr
Dec 28, 3:19 PM EST	Wind Advisory	AKQ	Dorchester, Somerset, Wicomico, Worcester	24 hr
Dec 30, 1:58 PM EST	Winter Weather Advisory	LWX	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 5 more	21 hr
Dec 30, 2:23 PM EST	Winter Weather Advisory	PBZ		22 hr
Dec 30, 10:57 PM EST	Mesoscale Discussion	SPC	Charles	6 hr
Dec 31, 3:22 AM EST	Winter Weather Advisory	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	8 hr
Dec 31, 6:38 PM EST	Winter Weather Advisory	LWX	Allegany, Baltimore, Carroll, Frederick, Washington	6 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
Tornado Watch	1
Mesoscale Discussion	8
Flooding
Areal Flood Warning	6
River Flood Warning	3
Flash Flood Watch	1
Flood Watch	4
Areal Flood Advisory	1
Winter
Blizzard Warning	1
Winter Storm Warning	10
Winter Storm Watch	8
Winter Weather Advisory	15
Cold
Wind Chill Advisory	2
Wind and dust
High Wind Warning	2
Wind Advisory	12
Fog and smoke
Dense Fog Advisory	4
Coast and beach
Coastal Flood Warning	2
Coastal Flood Watch	1
Coastal Flood Advisory	8
High Surf Advisory	2

By county

Every county with at least one alert. A county page lists each alert that covered it.

Nearby

Alerts in force now Tornadoes on record The radar archive 2008 2010

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.