An upper level low was over the Great Lakes and a cold front moved through the Mid Atlantic.  Warm and humid conditions, with dew points in the 70s, were ahead of the cold front and led to destabilization.  The majority of the thunderstorms with wind damage moved through North Central MD.

Thunderstorm Wind in HARFORD, MARYLAND
From 28-JUL-13 22:00:00 to 28-JUL-13 22:00:00 (EST-5)
Location: NORRISVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.25K
Reported by: Emergency Manager

There was a tree down on 2900 block of Duncan Road.

Thunderstorm Wind in HARFORD, MARYLAND
From 28-JUL-13 22:06:00 to 28-JUL-13 22:06:00 (EST-5)
Location: SHAWSVILLE
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

There was a pole broken with wires down on the 2900 Block of Bradenbaugh Road.

Thunderstorm Wind in HARFORD, MARYLAND
From 28-JUL-13 22:38:00 to 28-JUL-13 22:38:00 (EST-5)
Location: WHITEFORD
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 2.00K
Reported by: Emergency Manager

There were multiple trees down on the 1500 block of Ridge Road.

Thunderstorm Wind in HARFORD, MARYLAND
From 28-JUL-13 22:34:00 to 28-JUL-13 22:34:00 (EST-5)
Location: STREET
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.25K
Reported by: 911 Call Center

There was one tree down and wires down on Route 543 within one mile of Route 165.

Thunderstorm Wind in HARFORD, MARYLAND
From 28-JUL-13 22:50:00 to 28-JUL-13 22:50:00 (EST-5)
Location: BERKLEY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.25K
Reported by: Trained Spotter

There was a tree down on Flintville Road about one quarter mile north of Broad Creek.

Thunderstorm Wind in HARFORD, MARYLAND
From 28-JUL-13 22:54:00 to 28-JUL-13 22:54:00 (EST-5)
Location: BERKLEY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.25K
Reported by: Trained Spotter

There was a tree down on Flintville Road.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 28-JUL-13 21:37:00 to 28-JUL-13 21:37:00 (EST-5)
Location: BECKLEYSVILLE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 2.00K
Reported by: Public

There were numerous trees down and topped.

Thunderstorm Wind in CARROLL, MARYLAND
From 28-JUL-13 20:57:00 to 28-JUL-13 20:57:00 (EST-5)
Location: UNIONTOWN
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 2.00K
Reported by: Public

There were multiple trees damaged as well as damage to a building on 500 block of Jasontown Road.

Thunderstorm Wind in CARROLL, MARYLAND
From 28-JUL-13 21:00:00 to 28-JUL-13 21:00:00 (EST-5)
Location: FRIZZELLBURG
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 2.00K
Reported by: Public

There were three pear trees snapped off.

Thunderstorm Wind in CARROLL, MARYLAND
From 28-JUL-13 21:13:00 to 28-JUL-13 21:13:00 (EST-5)
Location: WESTMINSTER ARPT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 2.00K
Reported by: 911 Call Center

There were several trees down along route 97 between Stone Road and Bachmans Valley Road.

Thunderstorm Wind in CARROLL, MARYLAND
From 28-JUL-13 21:20:00 to 28-JUL-13 21:20:00 (EST-5)
Location: WESTMINSTER ARPT
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in HARFORD, MARYLAND
From 28-JUL-13 22:50:00 to 28-JUL-13 22:50:00 (EST-5)
Location: BEL AIR
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.25K
Reported by: Emergency Manager

There was a tree down on the 1400 block of Boggs Road.