An upper-level trough was over the waters on the 14th. Colder air aloft due to the upper trough caused moderate amounts of instability to develop. A surface trough triggered showers and thunderstorms and some thunderstorms produced gusty winds due to the instability.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 14-AUG-11 20:30:00 to 14-AUG-11 20:40:00 (EST-5)
Location: PINEY POINT
Magnitude: 37.00 MG
Reported by: Mesonet

Wind gusts up to 37 knots were reported at Cobb Point.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 14-AUG-11 22:28:00 to 14-AUG-11 22:28:00 (EST-5)
Location: CRISFIELD
Magnitude: 37.00 MG
Reported by: Mesonet

A wind gust of 37 knots was reported at Crisfield.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 14-AUG-11 22:06:00 to 14-AUG-11 22:06:00 (EST-5)
Location: BISHOPS HEAD
Magnitude: 34.00 MG
Reported by: Mesonet

A wind gust of 34 knots was reported at Bishops Head.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 14-AUG-11 22:07:00 to 14-AUG-11 22:07:00 (EST-5)
Location: SMITH ISLAND
Magnitude: 36.00 MG
Reported by: Mesonet

A wind gust of 36 knots was measured at Smith Island.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-AUG-11 21:22:00 to 14-AUG-11 21:22:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 34.00 EG
Reported by: ASOS

A wind gust in excess of 30 knots was reported at the Reagan National Airport.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 14-AUG-11 22:45:00 to 14-AUG-11 22:45:00 (EST-5)
Location: CHESAPEAKE BEACH
Magnitude: 34.00 EG
Reported by: Mesonet

A wind gust in excess of 30 knots was reported at the Chesapeake Rod N Reel.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 14-AUG-11 22:56:00 to 14-AUG-11 22:56:00 (EST-5)
Location: TOLLY POINT
Magnitude: 36.00 MG
Reported by: Mesonet

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

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 14-AUG-11 23:00:00 to 14-AUG-11 23:00:00 (EST-5)
Location: THOMAS POINT LIGHT
Magnitude: 46.00 MG
Reported by: Buoy

A wind gust of 46 knots was measured at the Thomas Point Lighthouse.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 14-AUG-11 20:30:00 to 14-AUG-11 20:30:00 (EST-5)
Location: PATUXENT RIVER ASOS
Magnitude: 39.00 MG
Reported by: ASOS

A wind gust of 39 knots was reported at Patuxent River.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 14-AUG-11 20:15:00 to 14-AUG-11 20:20:00 (EST-5)
Location: MONROE CREEK
Magnitude: 34.00 EG
Reported by: Mesonet

Wind gusts in excess of 30 knots were reported at Monroe Creek.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 14-AUG-11 09:15:00 to 14-AUG-11 09:20:00 (EST-5)
Location: POINT LOOKOUT
Magnitude: 36.00 MG
Reported by: Mesonet

Wind gust up to 36 knots were reported at Point Lookout.