Low pressure tracked through the Ohio Valley on the 11th before transferring its energy to another area of low pressure off the Mid-Atlantic Coast during the evening hours. A period of snow associated with these systems affected the area during the late afternoon and evening hours of the 11th. Upslope snow continued into the early morning hours of the 12 for locations along and west of the Allegheny front.

Winter Weather in CARROLL, MARYLAND
From 11-JAN-11 16:00:00 to 11-JAN-11 23:00:00 (EST-5)
Reported by: Trained Spotter

Three inches of snow was reported near Lineboro, Eldersburg, and Westminster.

Winter Weather in FREDERICK, MARYLAND
From 11-JAN-11 16:00:00 to 11-JAN-11 23:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall averaged between two and three inches across the county.

Winter Weather in MONTGOMERY, MARYLAND
From 11-JAN-11 17:00:00 to 11-JAN-11 22:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 2.6 inches near Damascus. A report of 2.0 inches of snow was received from Poolesville.

Winter Weather in CALVERT, MARYLAND
From 11-JAN-11 17:00:00 to 11-JAN-11 22:00:00 (EST-5)
Reported by: Trained Spotter

A trace of ice was reported from freezing rain.

Winter Weather in CHARLES, MARYLAND
From 11-JAN-11 17:00:00 to 11-JAN-11 22:00:00 (EST-5)
Reported by: Trained Spotter

Ice accumulation from freezing rain totaled up to one tenth of an inch near Bryantown. A trace of ice was also reported near Bryans Road.

Winter Weather in WASHINGTON, MARYLAND
From 11-JAN-11 16:00:00 to 11-JAN-11 23:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 3.5 inches at Hancock. Williamsport received 2.5 inches of snow.

Winter Weather in ST. MARY'S, MARYLAND
From 11-JAN-11 17:00:00 to 11-JAN-11 22:00:00 (EST-5)
Reported by: Unknown

A trace of ice accumulation from freezing rain was estimated across St Mary's County.

Winter Weather in EXTREME WESTERN ALLEGANY, MARYLAND
From 11-JAN-11 16:00:00 to 12-JAN-11 09:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 4.0 inches in Frostburg.

Winter Weather in NORTHERN BALTIMORE, MARYLAND
From 11-JAN-11 16:00:00 to 11-JAN-11 23:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall averaged between two and three inches across northern Baltimore County.

Winter Weather in SOUTHERN BALTIMORE, MARYLAND
From 11-JAN-11 16:00:00 to 11-JAN-11 23:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall averaged between two and three inches across southern Baltimore County.

Winter Weather in HARFORD, MARYLAND
From 11-JAN-11 16:00:00 to 11-JAN-11 23:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 5.0 inches at Scarboro. Snowfall averaged around four inches across the rest of the county.

Winter Weather in HOWARD, MARYLAND
From 11-JAN-11 17:00:00 to 11-JAN-11 22:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall averaged between two and three inches across the county.

Winter Weather in PRINCE GEORGES, MARYLAND
From 11-JAN-11 17:00:00 to 11-JAN-11 22:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 2.0 inches near Bowie. A report of 1.5 inches was received near College Park.

Winter Weather in ANNE ARUNDEL, MARYLAND
From 11-JAN-11 17:00:00 to 11-JAN-11 22:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 2.5 inches at Fort Meade. Two inches of snow was also received at Hidden Village, BWI Airport, and Riveria Beach.