Weather alerts in Maryland, December 2020

73 weather alerts in December 2020, 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 2020. Tap one for its archive.

Alerts: 73
Warnings: 27
Watches: 14
Advisories: 26
Busiest day: December 25, 202022 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
Nov 30, 7:50 PM EST	Winter Weather Advisory	LWX	Allegany	32 hr
Nov 30, 9:08 PM EST	Areal Flood Warning	LWX	Prince George's	20 hr
Nov 30, 10:19 PM EST	Areal Flood Warning	LWX	Charles	3 hr
Nov 30, 10:24 PM EST	Areal Flood Warning	LWX	Prince George's	106 min
Dec 4, 11:39 AM EST	Wind Advisory	AKQ	Worcester	27 hr
Dec 5, 1:55 AM EST	Areal Flood Advisory	AKQ	Dorchester, Somerset, Wicomico	6 hr
Dec 5, 2:14 AM EST	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	3 hr
Dec 5, 2:39 AM EST	Areal Flood Warning	LWX	Montgomery	6 hr
Dec 5, 3:04 AM EST	Areal Flood Advisory	PHI	Caroline	3 hr
Dec 5, 3:35 AM EST	Areal Flood Advisory	AKQ	Wicomico, Worcester	5 hr
Dec 5, 3:37 AM EST	Areal Flood Warning	LWX	Calvert, Charles, Prince George's, Saint Mary's	12 hr
Dec 5, 5:23 AM EST	Areal Flood Warning	LWX	Anne Arundel, Prince George's	16 hr
Dec 12, 7:09 AM EST	Dense Fog Advisory	LWX	Anne Arundel, Baltimore, Carroll, Cecil, Harford, Howard and 3 more	5 hr
Dec 13, 2:25 PM EST	Winter Weather Advisory	LWX	Allegany, Carroll, Frederick, Washington	23 hr
Dec 14, 4:43 AM EST	Winter Storm Watch	LWX	Allegany, Baltimore, Carroll, Cecil, Frederick, Harford and 4 more	35 hr
Dec 15, 4:09 AM EST	Winter Storm Warning	LWX	Allegany, Baltimore, Carroll, Frederick, Harford, Howard and 2 more	46 hr
Dec 15, 11:54 AM EST	Flood Watch	LWX	Anne Arundel, Calvert, Charles, Montgomery, Prince George's, Saint Mary's	34 hr
Dec 15, 4:00 PM EST	Winter Weather Advisory	LWX	Baltimore, Cecil, Harford, Howard, Montgomery, City of Baltimore	33 hr
Dec 15, 4:27 PM EST	Coastal Flood Advisory	AKQ	Worcester	32 hr
Dec 16, 3:50 AM EST	High Surf Advisory	AKQ	Worcester	25 hr
Dec 16, 8:38 AM EST	Mesoscale Discussion	SPC	Allegany, Washington	6 hr
Dec 16, 1:57 PM EST	Mesoscale Discussion	SPC	Allegany, Carroll, Frederick, Montgomery, Washington	5 hr
Dec 16, 10:42 PM EST	Areal Flood Warning	LWX	Saint Mary's	4 hr
Dec 17, 5:23 AM EST	High Surf Advisory	AKQ	Worcester	5 hr
Dec 17, 6:46 AM EST	Areal Flood Warning	LWX	Prince George's	6 hr
Dec 18, 5:27 AM EST	Dense Fog Advisory	LWX		14 hr
Dec 21, 4:10 AM EST	Winter Weather Advisory	LWX	Allegany	28 hr
Dec 21, 4:21 AM EST	Dense Fog Advisory	LWX	Allegany, Baltimore, Carroll, Frederick, Harford, Howard and 1 more	8 hr
Dec 21, 9:28 AM EST	Winter Storm Warning	LWX		24 hr
Dec 23, 4:27 AM EST	Flash Flood Watch	LWX	Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Cecil and 9 more	47 hr
Dec 23, 4:34 AM EST	Coastal Flood Watch	LWX	Anne Arundel, Baltimore, Harford, Saint Mary's, City of Baltimore	37 hr
Dec 23, 4:39 AM EST	Winter Storm Watch	LWX		23 hr
Dec 23, 2:48 PM EST	Wind Advisory	AKQ	Dorchester, Somerset, Wicomico, Worcester	35 hr
Dec 23, 3:23 PM EST	Wind Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	38 hr
Dec 23, 9:07 PM EST	River Flood Watch	LWX	Frederick	56 hr
Dec 23, 9:07 PM EST	River Flood Watch	LWX	Montgomery	43 hr
Dec 23, 9:07 PM EST	River Flood Watch	LWX	Washington	60 hr
Dec 23, 9:07 PM EST	Wind Advisory	LWX	Anne Arundel, Baltimore, Calvert, Cecil, Harford, Saint Mary's and 1 more	29 hr
Dec 23, 10:49 PM EST	High Surf Advisory	AKQ	Worcester	37 hr
Dec 24, 3:37 AM EST	Winter Storm Warning	LWX		30 hr
Dec 24, 4:41 AM EST	River Flood Watch	LWX	Washington	38 hr
Dec 24, 11:47 AM EST	River Flood Watch	LWX	Montgomery	31 hr
Dec 24, 11:47 AM EST	River Flood Watch	LWX	Montgomery	37 hr
Dec 24, 11:47 AM EST	River Flood Watch	LWX	Frederick	31 hr
Dec 24, 3:01 PM EST	Coastal Flood Advisory	AKQ	Dorchester, Somerset, Wicomico	22 hr
Dec 24, 3:36 PM EST	Severe Thunderstorm Warning	LWX	Charles	39 min
Dec 24, 5:54 PM EST	Coastal Flood Warning	LWX	Anne Arundel, Baltimore, City of Baltimore	13 hr
Dec 24, 5:54 PM EST	Coastal Flood Advisory	LWX	Anne Arundel, Baltimore, Calvert, Charles, Harford, Saint Mary's and 1 more	24 hr
Dec 24, 7:21 PM EST	River Flood Warning	LWX	Montgomery	21 hr
Dec 24, 7:21 PM EST	River Flood Warning	LWX	Frederick	11 hr
Dec 24, 7:21 PM EST	River Flood Warning	LWX	Washington	35 hr
Dec 24, 7:44 PM EST	High Wind Warning	AKQ	Worcester	6 hr
Dec 24, 8:05 PM EST	River Flood Watch	LWX	Washington	15 hr
Dec 24, 8:26 PM EST	Areal Flood Advisory	AKQ	Dorchester	6 hr
Dec 24, 9:04 PM EST	Areal Flood Warning	LWX	Carroll, Frederick	12 hr
Dec 24, 9:08 PM EST	Coastal Flood Advisory	PHI	Kent	14 hr
Dec 25, 12:15 AM EST	Special Weather Statement	AKQ	Dorchester	45 min
Dec 25, 12:31 AM EST	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	44 min
Dec 25, 12:53 AM EST	Special Weather Statement	AKQ	Somerset, Wicomico	67 min
Dec 25, 12:56 AM EST	Special Weather Statement	AKQ	Worcester	49 min
Dec 25, 2:11 AM EST	Areal Flood Warning	LWX	Baltimore	9 hr
Dec 25, 2:17 AM EST	Areal Flood Warning	LWX	Anne Arundel, Howard	8 hr
Dec 25, 2:18 AM EST	Areal Flood Warning	LWX	Anne Arundel, Baltimore, Howard	6 hr
Dec 25, 2:23 AM EST	Areal Flood Warning	LWX	Cecil	6 hr
Dec 25, 2:45 AM EST	Wind Chill Advisory	LWX		30 hr
Dec 25, 9:16 AM EST	Winter Weather Advisory	LWX		10 hr
Dec 25, 10:27 AM EST	Coastal Flood Advisory	LWX	Saint Mary's	3 hr
Dec 25, 1:17 PM EST	River Flood Watch	LWX	Cecil	8 hr
Dec 25, 1:54 PM EST	Areal Flood Warning	LWX	Frederick	11 hr
Dec 25, 3:04 PM EST	Areal Flood Warning	PHI	Caroline	17 hr
Dec 25, 7:12 PM EST	Special Weather Statement	PHI	Caroline	33 min
Dec 25, 9:29 PM EST	River Flood Warning	LWX	Cecil, Harford	41 hr
Dec 26, 1:07 AM EST	River Flood Warning	LWX	Montgomery	15 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	2
Mesoscale Discussion	2
Special Weather Statement	4
Flooding
Areal Flood Warning	15
River Flood Warning	5
Flash Flood Watch	1
Flood Watch	1
River Flood Watch	9
Areal Flood Advisory	5
Winter
Winter Storm Warning	3
Winter Storm Watch	2
Winter Weather Advisory	5
Cold
Wind Chill Advisory	1
Wind and dust
High Wind Warning	1
Wind Advisory	4
Fog and smoke
Dense Fog Advisory	3
Coast and beach
Coastal Flood Warning	1
Coastal Flood Watch	1
Coastal Flood Advisory	5
High Surf Advisory	3

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 2019 2021

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.