A pressure trough remained over Maryland on the 12th while an upper-level disturbance passed through in a zonal flow aloft. The forcing from these two systems were responsible for the development of showers and thunderstorms. Due to moderate amounts of instability, some thunderstorms became severe with damaging winds.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 12-JUL-10 14:12:00 to 12-JUL-10 14:12:00 (EST-5)
Location: COLLINGTON
Magnitude: 52.00 EG
Property damage: 5.00K
Reported by: Broadcast Media

Several trees were down along Highbridge Road at the intersection with Route 450.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 12-JUL-10 13:52:00 to 12-JUL-10 13:52:00 (EST-5)
Location: STONY RUN
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Fire Department/Rescue

A tree was down on Standard Drive near Parkway Drive.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 12-JUL-10 14:47:00 to 12-JUL-10 14:47:00 (EST-5)
Location: PASADENA
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Fire Department/Rescue

A tree was down near the intersection of Light Street Avenue and West Earleigh Heights Road.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 12-JUL-10 14:53:00 to 12-JUL-10 14:53:00 (EST-5)
Location: GREEN HAVEN
Magnitude: 52.00 EG
Property damage: 3.00K
Reported by: Fire Department/Rescue

Three to four trees were down on Stone Haven Drive. Some trees were eighteen inches in diameter.

Thunderstorm Wind in BALTIMORE CITY (C), MARYLAND
From 12-JUL-10 14:07:00 to 12-JUL-10 14:07:00 (EST-5)
Location: WALBROOK
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Fire Department/Rescue

A tree was down over the 2400 Block of Chelsea Terrace.

Thunderstorm Wind in BALTIMORE CITY (C), MARYLAND
From 12-JUL-10 14:07:00 to 12-JUL-10 14:07:00 (EST-5)
Location: WALBROOK
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Fire Department/Rescue

A tree fell onto Alto Road.

Thunderstorm Wind in BALTIMORE CITY (C), MARYLAND
From 12-JUL-10 14:06:00 to 12-JUL-10 14:06:00 (EST-5)
Location: WALBROOK
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Fire Department/Rescue

A tree was knocked down onto the highway near Gwynnoak.

Thunderstorm Wind in BALTIMORE CITY (C), MARYLAND
From 12-JUL-10 14:25:00 to 12-JUL-10 14:25:00 (EST-5)
Location: ROLAND PARK
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Fire Department/Rescue

A tree was down on the 2100 Block of Carterdale Road.

Thunderstorm Wind in BALTIMORE CITY (C), MARYLAND
From 12-JUL-10 14:27:00 to 12-JUL-10 14:27:00 (EST-5)
Location: HAMPDEN
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Fire Department/Rescue

A tree was down on the 1200 Block of West Cold Spring Lane.

Thunderstorm Wind in BALTIMORE CITY (C), MARYLAND
From 12-JUL-10 14:08:00 to 12-JUL-10 14:08:00 (EST-5)
Location: CATONSVILLE
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Fire Department/Rescue

A tree was down on the 3800 Block of Crescent Street.

Thunderstorm Wind in BALTIMORE CITY (C), MARYLAND
From 12-JUL-10 14:10:00 to 12-JUL-10 14:10:00 (EST-5)
Location: MT ROYAL
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Fire Department/Rescue

A tree was over the roadway on West 30th Street.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 12-JUL-10 13:45:00 to 12-JUL-10 13:45:00 (EST-5)
Location: MILFORD
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Fire Department/Rescue

A tree was down at the Milford Academy.