Low pressure passed by to the south and this caused a period of snow across southern Maryland on the 9th. For other locations, a potent upper-level trough and disturbance associated with the trough passed through the area on the 9th. The forcing from the disturbance caused a period of snow to develop.

Winter Weather in CALVERT, MARYLAND
From 08-DEC-17 17:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 3.0 inches near Saint Leonard and 3.0 inches near Deale.  Snowfall averaged between 2 and 5 inches across the county.

Winter Weather in ST. MARY'S, MARYLAND
From 08-DEC-17 17:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 6.2 inches near Ridge and 5.0 inches near Leonardtown. Snowfall averaged between 3 and 6 inches across the county.

Winter Weather in CHARLES, MARYLAND
From 09-DEC-17 05:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 2.3 inches near Dentsville and 2.0 inches near Bryantown.

Winter Storm in CARROLL, MARYLAND
From 09-DEC-17 05:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall averaged between 3 and 6 inches across Carroll County. Snowfall totaled up to 6.1 inches near Oakland, 5.7 inches near Gamber and 5.4 inches near Winfield.

Winter Storm in NORTHERN BALTIMORE, MARYLAND
From 09-DEC-17 05:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall averaged between 3 and 6 inches across northern Baltimore County. Snowfall totaled up to 6.0 inches near Bentley Springs and 5.5 inches near Parkton. Snowfall totaled up to 5.0 inches near Glyndon and 4.5 in Reisterstown.

Winter Weather in ANNE ARUNDEL, MARYLAND
From 09-DEC-17 05:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 3.5 inches near South Gate and 2.0 inches in Deale. Snowfall averaged between 2 and 4 inches across the county.

Winter Weather in FREDERICK, MARYLAND
From 09-DEC-17 05:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 3.0 inches near New Market and 2.0 inches near Buckeystown.

Winter Weather in SOUTHERN BALTIMORE, MARYLAND
From 09-DEC-17 05:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 4.3 inches near Towson. Snowfall averaged between 2 and 4 inches across southern Baltimore County.

Winter Weather in NORTHWEST HARFORD, MARYLAND
From 09-DEC-17 05:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall averaged between 3 and 5 inches across northwest Harford County. Snowfall totaled up to 4.3 inches in Norrisville.

Winter Weather in SOUTHEAST HARFORD, MARYLAND
From 09-DEC-17 05:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall averaged between 2 and 4 inches across southeast Harford County. Snowfall totaled up to 4.0 inches near Abingdon.

Winter Weather in PRINCE GEORGES, MARYLAND
From 09-DEC-17 05:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 2.5 inches in Morningside and 2.7 inches in Bowie. Snowfall averaged between 2 and 3 inches across the county.

Winter Weather in NORTHWEST MONTGOMERY, MARYLAND
From 09-DEC-17 05:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall averaged between 3 and 5 inches across northern Montgomery County. Snowfall totaled up to 5.2 inches near Damascus and 3.9 inches near Clarksburg.

Winter Weather in CENTRAL AND SOUTHEAST MONTGOMERY, MARYLAND
From 09-DEC-17 05:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall averaged between 2 and 4 inches across southeastern Montgomery County.

Winter Weather in NORTHWEST HOWARD, MARYLAND
From 09-DEC-17 05:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall averaged between 3 and 5 inches across northwest Howard County. Snowfall totaled up to 3.5 inches in Ellicott City.

Winter Weather in CENTRAL AND SOUTHEAST HOWARD, MARYLAND
From 09-DEC-17 05:00:00 to 09-DEC-17 21:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall averaged between 2 and 4 inches across northwest Howard County. Snowfall totaled up 2.0 inches in Columbia.