A backdoor cold front stalled out near the waters on the 12th while and upper-level disturbance passed through the area. A hot and humid air mass ahead of the cold front produced moderate amounts of instability. Some thunderstorms that developed were able to produce gusty winds.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 12-AUG-10 06:37:00 to 12-AUG-10 06:37:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 37.00 MG
Reported by: ASOS

A wind gust of 37 knots was reported at Reagan National.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 12-AUG-10 07:25:00 to 12-AUG-10 07:25:00 (EST-5)
Location: KENT ISLAND
Magnitude: 34.00 EG
Reported by: Mesonet

A wind gust in excess of 30 knots was reported at Kent Island.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 12-AUG-10 07:11:00 to 12-AUG-10 07:11:00 (EST-5)
Location: GREENBERRY POINT
Magnitude: 36.00 MG
Reported by: Mesonet

A wind gust of 36 knots was reported at Greenbury Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 12-AUG-10 08:00:00 to 12-AUG-10 08:06:00 (EST-5)
Location: COVE POINT
Magnitude: 35.00 MG
Reported by: Buoy

Wind gusts up to 35 knots were reported at Cove Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 12-AUG-10 07:20:00 to 12-AUG-10 07:20:00 (EST-5)
Location: CHESAPEAKE BEACH
Magnitude: 34.00 EG
Reported by: Mesonet

A wind gust in excess of 30 knots was reported at Chesapeake Beach.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 12-AUG-10 07:40:00 to 12-AUG-10 07:40:00 (EST-5)
Location: MID BAY BUOY
Magnitude: 35.00 MG
Reported by: Buoy

A wind gust of 35 knots was reported at Gooses Reef Buoy.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 12-AUG-10 07:01:00 to 12-AUG-10 07:01:00 (EST-5)
Location: ANNAPOLIS
Magnitude: 34.00 EG
Reported by: ASOS

A wind gust in excess of 30 knots was reported at Annapolis.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 12-AUG-10 06:44:00 to 12-AUG-10 06:44:00 (EST-5)
Location: WASHINGTON NATIONALS PARK
Magnitude: 34.00 EG
Reported by: Mesonet

A wind gust in excess of 30 knots was reported at the Washington Nationals Park.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 12-AUG-10 06:19:00 to 12-AUG-10 06:19:00 (EST-5)
Location: ORIOLE PARK AT CAMDEN YARDS
Magnitude: 37.00 MG
Reported by: Mesonet

A wind gust of 37 knots was measured at Oriole Park.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 12-AUG-10 08:10:00 to 12-AUG-10 08:10:00 (EST-5)
Location: PATUXENT RIVER ASOS
Magnitude: 34.00 EG
Reported by: ASOS

A wind gust in excess of 30 knots was measured at Patuxent River.

Waterspout in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 12-AUG-10 09:15:00 to 12-AUG-10 09:15:00 (EST-5)
Location: LOWER HOOPERS ISLAND
Property damage: 1.00K
Reported by: Public

A water spout was reported in the Honga River near Bentley Point. There was damage reported to some boat canopies.