An upper-level disturbance passed through the area on the 11th. The atmosphere was very unstable due to a hot and humid air mass in place. The combination of forcing from the upper-level disturbance along with high amounts of instability led to the development of showers and thunderstorms. Thunderstorms produced damaging winds and large hail.

Thunderstorm Wind in FREDERICK, MARYLAND
From 11-JUL-11 18:05:00 to 11-JUL-11 18:05:00 (EST-5)
Location: GARFIELD
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: State Official

A tree was down on Brandenburg Hollow Road.

Thunderstorm Wind in FREDERICK, MARYLAND
From 11-JUL-11 18:14:00 to 11-JUL-11 18:14:00 (EST-5)
Location: UTICA
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: State Official

Two trees were down on Angleberger Road.

Thunderstorm Wind in FREDERICK, MARYLAND
From 11-JUL-11 18:15:00 to 11-JUL-11 18:15:00 (EST-5)
Location: UTICA
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: State Official

A tree was down on Lenhart Road.

Thunderstorm Wind in FREDERICK, MARYLAND
From 11-JUL-11 18:15:00 to 11-JUL-11 18:15:00 (EST-5)
Location: UTICA
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: State Official

A tree was down on Old Frederick Road.

Thunderstorm Wind in FREDERICK, MARYLAND
From 11-JUL-11 18:15:00 to 11-JUL-11 18:15:00 (EST-5)
Location: UTICA
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: State Official

A tree was down on Utica Mills Circle.

Thunderstorm Wind in CARROLL, MARYLAND
From 11-JUL-11 18:33:00 to 11-JUL-11 18:33:00 (EST-5)
Location: BRIDGEPORT
Magnitude: 61.00 EG
Property damage: 20.00K
Reported by: Emergency Manager

Trees were down along Baptist Road. Power Poles were snapped and a barn collapsed.

Thunderstorm Wind in CARROLL, MARYLAND
From 11-JUL-11 18:36:00 to 11-JUL-11 18:36:00 (EST-5)
Location: PIPE CREEK MILL
Magnitude: 56.00 EG
Property damage: 5.00K
Reported by: Trained Spotter

Several large trees were down.

Thunderstorm Wind in FREDERICK, MARYLAND
From 11-JUL-11 18:45:00 to 11-JUL-11 18:45:00 (EST-5)
Location: UNIONVILLE
Magnitude: 52.00 EG
Property damage: 2.00K
Reported by: State Official

Trees were down along McKinstry Mill Road.

Thunderstorm Wind in FREDERICK, MARYLAND
From 11-JUL-11 18:45:00 to 11-JUL-11 18:45:00 (EST-5)
Location: SAMS CREEK
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: State Official

A tree was down on Barnes Road.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 11-JUL-11 18:50:00 to 11-JUL-11 18:50:00 (EST-5)
Location: POOLESVILLE
Magnitude: 52.00 EG
Property damage: 5.00K
Reported by: State Official

Multiple trees were down on the Poolesville area.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 11-JUL-11 18:54:00 to 11-JUL-11 18:54:00 (EST-5)
Location: GERMANTOWN
Magnitude: 45.00 EG
Property damage: 1.00K
Reported by: State Official

Multiple trees were down in the Germantown area.

Thunderstorm Wind in HOWARD, MARYLAND
From 11-JUL-11 19:17:00 to 11-JUL-11 19:17:00 (EST-5)
Location: HIGHLAND
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: State Official

A tree was down at Prestwick Drive and Highland.

Thunderstorm Wind in HOWARD, MARYLAND
From 11-JUL-11 19:25:00 to 11-JUL-11 19:25:00 (EST-5)
Location: SCAGGSVILLE
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: State Official

A tree fell onto power lines on Belgaro Road.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 11-JUL-11 19:55:00 to 11-JUL-11 19:55:00 (EST-5)
Location: OAKLEIGH
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: State Official

Scattered trees were down.

Thunderstorm Wind in CHARLES, MARYLAND
From 11-JUL-11 20:00:00 to 11-JUL-11 20:00:00 (EST-5)
Location: POMFRET
Magnitude: 52.00 EG
Property damage: 3.00K
Reported by: State Official

Trees were down in the vicinity of Pomfret Road and Brierwood Road.

Thunderstorm Wind in HARFORD, MARYLAND
From 11-JUL-11 20:09:00 to 11-JUL-11 20:09:00 (EST-5)
Location: PERRYMAN
Magnitude: 52.00 EG
Property damage: 5.00K
Reported by: Emergency Manager

Trees were down at Perryman.

Thunderstorm Wind in HARFORD, MARYLAND
From 11-JUL-11 20:14:00 to 11-JUL-11 20:14:00 (EST-5)
Location: DARLINGTON
Magnitude: 52.00 EG
Property damage: 5.00K
Reported by: Emergency Manager

Trees were down at Darlington.

Thunderstorm Wind in CALVERT, MARYLAND
From 11-JUL-11 20:54:00 to 11-JUL-11 20:54:00 (EST-5)
Location: ST LEONARD
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: State Official

A tree was down on St. Leonard Road and Parkers Creek Road.

Thunderstorm Wind in CALVERT, MARYLAND
From 11-JUL-11 20:52:00 to 11-JUL-11 20:52:00 (EST-5)
Location: MUTUAL
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: State Official

A tree was down near the intersection of Crane and Hence Road.

Thunderstorm Wind in CARROLL, MARYLAND
From 11-JUL-11 18:24:00 to 11-JUL-11 18:24:00 (EST-5)
Location: BRIDGEPORT
Magnitude: 61.00 EG
Property damage: 15.00K
Reported by: Emergency Manager

A barn was toppled by thunderstorm winds.

Thunderstorm Wind in CARROLL, MARYLAND
From 11-JUL-11 18:26:00 to 11-JUL-11 18:26:00 (EST-5)
Location: TANEYTOWN
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Emergency Manager

A large tree was toppled.

Thunderstorm Wind in CARROLL, MARYLAND
From 11-JUL-11 18:38:00 to 11-JUL-11 18:38:00 (EST-5)
Location: SILVER RUN
Magnitude: 61.00 EG
Property damage: 5.00K
Reported by: Emergency Manager

Several large trees were toppled near Silver run.

Thunderstorm Wind in FREDERICK, MARYLAND
From 11-JUL-11 17:53:00 to 11-JUL-11 17:53:00 (EST-5)
Location: LANTZ
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: State Official

A tree fell onto Foxville Deerfield Road.

Thunderstorm Wind in HOWARD, MARYLAND
From 11-JUL-11 19:26:00 to 11-JUL-11 19:26:00 (EST-5)
Location: SCAGGSVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: State Official

A tree fell onto power lines on Graeloch Road.