A mid-level trough of low pressure remained over the area, providing cooler air aloft. A southerly flow around high pressure over the Atlantic ushered in plenty of warm and moist air. the combination of warm and moist air at the surface along with cooler air aloft caused moderate amounts of instability to develop. Some thunderstorms that developed due to the instability were able to cause damaging winds and large hail.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 07-JUL-11 23:13:00 to 07-JUL-11 23:13:00 (EST-5)
Location: BROOKLANDVILLE
Magnitude: 56.00 EG
Property damage: 3.00K
Reported by: Fire Department/Rescue

Multiple trees were down due to thunderstorm winds.

Hail in BALTIMORE, MARYLAND
From 07-JUL-11 17:10:00 to 07-JUL-11 17:10:00 (EST-5)
Location: DUNDALK
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter sized hail was reported near Dundalk.

Hail in BALTIMORE, MARYLAND
From 07-JUL-11 17:35:00 to 07-JUL-11 17:35:00 (EST-5)
Location: DUNDALK
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter sized hail was reported near Dundalk.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 07-JUL-11 17:25:00 to 07-JUL-11 17:25:00 (EST-5)
Location: DUNDALK
Magnitude: 56.00 EG
Property damage: 3.00K
Reported by: Trained Spotter

Six trees between four and ten inches in diameter were down along Merrit Boulevard.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 07-JUL-11 17:33:00 to 07-JUL-11 17:33:00 (EST-5)
Location: DUNDALK
Magnitude: 66.00 EG
Property damage: 100.00K
Reported by: Trained Spotter

Roofs were partially taken off of several units in an Apartment Complex along the intersection of Mornington Road and Meadow Way.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 07-JUL-11 17:40:00 to 07-JUL-11 17:40:00 (EST-5)
Location: TURNER
Magnitude: 56.00 EG
Property damage: 5.00K
Reported by: Trained Spotter

Multiple trees that were three to four feet in diameter were blown down.  Many limbs were also down.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 07-JUL-11 17:28:00 to 07-JUL-11 17:28:00 (EST-5)
Location: DUNDALK
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Trained Spotter

A large tree that was three feet in diameter was knocked down.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 07-JUL-11 18:54:00 to 07-JUL-11 18:54:00 (EST-5)
Location: BALTIMORE HIGHLANDS
Magnitude: 61.00 EG
Property damage: 75.00K
Reported by: Trained Spotter

Roofs were blown off town homes in Catawba Court.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 07-JUL-11 22:56:00 to 07-JUL-11 22:56:00 (EST-5)
Location: CRONHARDT
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: Trained Spotter

Large tree limbs were down along Falls Road.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 07-JUL-11 17:33:00 to 07-JUL-11 17:33:00 (EST-5)
Location: DUNDALK
Magnitude: 56.00 EG
Property damage: 15.00K
Reported by: Trained Spotter

A tree that was one foot in diameter fell onto a house near the intersection of Sollers Point Road and Mornington Road.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 07-JUL-11 22:58:00 to 07-JUL-11 22:58:00 (EST-5)
Location: SPARKS
Magnitude: 56.00 EG
Property damage: 1.00K
Reported by: Fire Department/Rescue

A tree fell onto wires along the 2300 block of West Joppa Road.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 07-JUL-11 19:20:00 to 07-JUL-11 19:20:00 (EST-5)
Location: NORTH LINTHICUM
Magnitude: 61.00 EG
Property damage: 15.00K
Reported by: Trained Spotter

Roof damage was reported to apartment buildings.

Hail in BALTIMORE, MARYLAND
From 07-JUL-11 17:27:00 to 07-JUL-11 17:27:00 (EST-5)
Location: ESSEX
Magnitude: 1.00 
Reported by: Public

Quarter sized hail was reported near Essex.

Thunderstorm Wind in WASHINGTON, MARYLAND
From 07-JUL-11 18:30:00 to 07-JUL-11 18:30:00 (EST-5)
Location: GARRETTS MILL
Magnitude: 66.00 EG
Property damage: 40.00K
Reported by: Public

Trees were uprooted or snapped and large limbs were also down. Trees fell onto a house and a vehicle.