A potent area of low pressure tracked through the Midwest on the 9th. As the low approached the Mid-Atlantic coast, this system phased with energy in the southern branch of the jet stream to cause strong low pressure to develop just off the Delmarva peninsula. The low continued to rapidly strengthen as it moved off to our northeast on the 10th.
The system spread snow across Maryland that began on the 9th and lasted into the 10th. Major snow accumulations were reported with this storm, especially across the northeastern portion of Maryland. As the low pressure rapidly intensified, strong winds caused blowing and drifting snow that led to blizzard conditions across portions of the state.

Winter Storm in PRINCE GEORGES, MARYLAND
From 09-FEB-10 17:00:00 to 10-FEB-10 18:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 13.1 inches near Bowie. Snowfall amounts between 7 and 12 inches were reported across the rest of the county.

Winter Storm in ST. MARY'S, MARYLAND
From 09-FEB-10 17:00:00 to 10-FEB-10 18:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 6.2 and 6.0 inches near Hillville and Hollywood respectively.

Winter Storm in SOUTHERN BALTIMORE, MARYLAND
From 09-FEB-10 17:00:00 to 10-FEB-10 18:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 22.3 inches in Essex. Snowfall averaged between one and two feet across the rest of southern Baltimore county.

Winter Storm in CALVERT, MARYLAND
From 09-FEB-10 17:00:00 to 10-FEB-10 18:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 7.0 inches in Huntingtown. A snowfall amount of 5.5 inches was received near Tracys Landing.

Winter Storm in HARFORD, MARYLAND
From 09-FEB-10 17:00:00 to 10-FEB-10 18:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 21.0 inches in Scarboro. Snowfall amounts between 13 and 20 inches were received across the rest of the county.

Winter Storm in FREDERICK, MARYLAND
From 09-FEB-10 17:00:00 to 10-FEB-10 18:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 25.0 inches near Smithsburg. Snowfall averaged between one and two feet across the rest of the county.

Winter Storm in HOWARD, MARYLAND
From 09-FEB-10 17:00:00 to 10-FEB-10 18:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 21.5 inches near Gaither. Snowfall amounts between 12 and 18 inches were received across the rest of the county.

Winter Storm in MONTGOMERY, MARYLAND
From 09-FEB-10 17:00:00 to 10-FEB-10 18:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 18.0 inches near Germantown. Snowfall averaged between 9 and 18 inches across the rest of the county.

Blizzard in EXTREME WESTERN ALLEGANY, MARYLAND
From 10-FEB-10 03:00:00 to 10-FEB-10 22:00:00 (EST-5)
Reported by: Unknown

Wind gusts were estimated to be over 35 mph along with visibility below one quarter mile to produce blizzard conditions.

Winter Storm in CARROLL, MARYLAND
From 09-FEB-10 17:00:00 to 10-FEB-10 18:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall averaged between 21 and 26 inches across the county.

Blizzard in HARFORD, MARYLAND
From 10-FEB-10 09:55:00 to 10-FEB-10 15:55:00 (EST-5)
Reported by: Unknown

Wind gusts were estimated to be over 35 mph along with visibility below one quarter mile to produce blizzard conditions.

Blizzard in HOWARD, MARYLAND
From 10-FEB-10 10:00:00 to 10-FEB-10 14:00:00 (EST-5)
Reported by: Unknown

Wind gusts were estimated to be over 35 mph along with visibility below one quarter mile to produce blizzard conditions.

Blizzard in ST. MARY'S, MARYLAND
From 10-FEB-10 08:00:00 to 10-FEB-10 14:30:00 (EST-5)
Reported by: ASOS

Visibility was below one quarter mile due to blowing and drifting snow. The low visibility combined with wind gusts over 35 mph to produce blizzard conditions.

Blizzard in MONTGOMERY, MARYLAND
From 10-FEB-10 09:52:00 to 10-FEB-10 14:00:00 (EST-5)
Reported by: AWOS

Visibility was below one quarter mile due to blowing and drifting snow. The low visibility combined with wind gusts over 35 mph to produce blizzard conditions.

Blizzard in ANNE ARUNDEL, MARYLAND
From 10-FEB-10 09:54:00 to 10-FEB-10 16:00:00 (EST-5)
Reported by: ASOS

Visibility was below one quarter mile due to blowing and drifting snow. The low visibility combined with wind gusts over 35 mph to produce blizzard conditions.

Winter Storm in ANNE ARUNDEL, MARYLAND
From 09-FEB-10 17:00:00 to 10-FEB-10 18:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 20.8 inches at Pasadena. Snow amounts of 16.6 inches were received near Laurel and Arnold. Snowfall amounts averaged between 10 and 20 inches across the rest of the county.

Winter Storm in NORTHERN BALTIMORE, MARYLAND
From 09-FEB-10 17:00:00 to 10-FEB-10 18:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 24.5 inches near Glyndon and 21.0 inches in Parkton and Freeland. Snowfall averaged between one and two feet across the rest of northern Baltimore county.

Winter Storm in CHARLES, MARYLAND
From 09-FEB-10 17:00:00 to 10-FEB-10 16:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 10.8 inches near Bryans Road. Snowfall amounts averaged around five to seven inches across the rest of the county.

Blizzard in SOUTHERN BALTIMORE, MARYLAND
From 10-FEB-10 09:55:00 to 10-FEB-10 15:55:00 (EST-5)
Reported by: ASOS

Visibility was below one quarter mile due to blowing and drifting snow. The low visibility combined with wind gusts over 35 mph to produce blizzard conditions.

Winter Storm in EXTREME WESTERN ALLEGANY, MARYLAND
From 09-FEB-10 12:00:00 to 11-FEB-10 03:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 8.5 inches at Eckhart Mines and 7.8 inches near Frostburg.

Winter Storm in CENTRAL AND EASTERN ALLEGANY, MARYLAND
From 09-FEB-10 12:00:00 to 10-FEB-10 14:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall totaled up to 6.0 inches near Cumberland.

Winter Storm in WASHINGTON, MARYLAND
From 09-FEB-10 17:00:00 to 10-FEB-10 18:00:00 (EST-5)
Reported by: Trained Spotter

Snowfall amounts were reported between 11 and 17 inches across the county.

Blizzard in NORTHERN BALTIMORE, MARYLAND
From 10-FEB-10 09:55:00 to 10-FEB-10 15:55:00 (EST-5)
Reported by: Unknown

Wind gusts were estimated to be over 35 mph along with visibility below one quarter mile to produce blizzard conditions.

Blizzard in CALVERT, MARYLAND
From 10-FEB-10 08:00:00 to 10-FEB-10 14:30:00 (EST-5)
Reported by: Unknown

Wind gusts were estimated to be over 35 mph along with visibility below one quarter mile to produce blizzard conditions.

Blizzard in CHARLES, MARYLAND
From 10-FEB-10 08:00:00 to 10-FEB-10 14:30:00 (EST-5)
Reported by: Unknown

Wind gusts were estimated to be over 35 mph along with visibility below one quarter mile to produce blizzard conditions.

Blizzard in PRINCE GEORGES, MARYLAND
From 10-FEB-10 08:00:00 to 10-FEB-10 14:00:00 (EST-5)
Reported by: Unknown

Wind gusts were estimated to be over 35 mph along with visibility below one quarter mile to produce blizzard conditions.