A cold front and an unstable atmosphere led to some severe thunderstorms.

Hail in FREDERICK, MARYLAND
From 12-AUG-17 16:31:00 to 12-AUG-17 16:31:00 (EST-5)
Location: FREDERICK
Magnitude: 1.00 
Reported by: Public

Quarter sized hail was reported near Frederick.

Hail in FREDERICK, MARYLAND
From 12-AUG-17 17:10:00 to 12-AUG-17 17:10:00 (EST-5)
Location: KEMPTOWN
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter sized hail was reported near Friendship.

Thunderstorm Wind in ALLEGANY, MARYLAND
From 12-AUG-17 14:27:00 to 12-AUG-17 14:27:00 (EST-5)
Location: PINEY GROVE
Magnitude: 50.00 EG
Reported by: 911 Call Center

Two trees were down along Turkey Farm Road.

Thunderstorm Wind in ALLEGANY, MARYLAND
From 12-AUG-17 14:28:00 to 12-AUG-17 14:28:00 (EST-5)
Location: LITTLE ORLEANS
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down on Oldtown Orleans Road near Apple Road.

Thunderstorm Wind in FREDERICK, MARYLAND
From 12-AUG-17 16:20:00 to 12-AUG-17 16:20:00 (EST-5)
Location: BRADDOCK HGTS
Magnitude: 50.00 EG
Reported by: Broadcast Media

A tree was down blocking both directions of Baltimore National Pike at Gambrill Park Road.

Thunderstorm Wind in FREDERICK, MARYLAND
From 12-AUG-17 16:27:00 to 12-AUG-17 16:27:00 (EST-5)
Location: FREDERICK
Magnitude: 50.00 EG
Reported by: 911 Call Center

Poles and wires were down on Rosemont Avenue.

Thunderstorm Wind in FREDERICK, MARYLAND
From 12-AUG-17 16:32:00 to 12-AUG-17 16:32:00 (EST-5)
Location: FREDERICK
Magnitude: 50.00 EG
Reported by: NWS Employee

A tree was down blocking the exit ramp at Interstate 70 and Highway 40.

Thunderstorm Wind in FREDERICK, MARYLAND
From 12-AUG-17 17:04:00 to 12-AUG-17 17:04:00 (EST-5)
Location: KEMPTOWN
Magnitude: 50.00 EG
Reported by: Trained Spotter

A tree eight inches in diameter was down in the 13000 Block of Penn Shop Road.

Thunderstorm Wind in HOWARD, MARYLAND
From 12-AUG-17 17:08:00 to 12-AUG-17 17:08:00 (EST-5)
Location: LONG CORNER
Magnitude: 50.00 EG
Reported by: 911 Call Center

Two trees were down near the intersection of Long Corner Road and New Cut Road.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 12-AUG-17 17:11:00 to 12-AUG-17 17:11:00 (EST-5)
Location: MULLINIX
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down near the intersection off Long Corner Road and Gue Road.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 12-AUG-17 18:06:00 to 12-AUG-17 18:06:00 (EST-5)
Location: HOWARDVILLE
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down on a light pole near the intersection of Court Road and Woodholme Avenue.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 12-AUG-17 18:25:00 to 12-AUG-17 18:25:00 (EST-5)
Location: CABIN JOHN
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down on Clara Barton Parkway near the Capital Beltway.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 12-AUG-17 18:26:00 to 12-AUG-17 18:26:00 (EST-5)
Location: RELAY
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down in the roadway near the intersection of Southwestern Boulevard and Francis Avenue.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 12-AUG-17 19:15:00 to 12-AUG-17 19:15:00 (EST-5)
Location: SEVERNA PARK
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down blocking two right lanes of Governor Ritchie Highway at Cypress Creek Road.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 12-AUG-17 19:49:00 to 12-AUG-17 19:49:00 (EST-5)
Location: NAYLOR
Magnitude: 50.00 EG
Reported by: Trained Spotter

Several large six inch in diameter tree limbs were down along Nottingham Road and Molly Berry Road.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 12-AUG-17 19:24:00 to 12-AUG-17 19:24:00 (EST-5)
Location: REVELL
Magnitude: 54.00 MG
Reported by: Mesonet

A wind gust of 62 mph was reported.