A surface trough combined with moderate instability caused showers and thunderstorms to develop. There was enough instability for thunderstorms to produce gusty winds.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 18-JUL-12 15:40:00 to 18-JUL-12 15:40:00 (EST-5)
Location: PATAPSCO BUOY
Magnitude: 47.00 MG
Reported by: Buoy

A wind gust of 47 knots was reported at Patapsco Buoy.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 18-JUL-12 15:30:00 to 18-JUL-12 15:30:00 (EST-5)
Location: BALTIMORE CITY
Magnitude: 34.00 MG
Reported by: Mesonet

A wind gust of 34 knots was measured.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 18-JUL-12 16:03:00 to 18-JUL-12 16:06:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 34.00 EG
Reported by: ASOS

Wind gusts in excess of 30 knots were reported at Reagan National.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 18-JUL-12 15:59:00 to 18-JUL-12 15:59:00 (EST-5)
Location: WASHINGTON NATIONALS PARK
Magnitude: 34.00 MG
Reported by: Mesonet

A wind gust of 34 knots was measured.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 18-JUL-12 16:20:00 to 18-JUL-12 16:40:00 (EST-5)
Location: ANNAPOLIS
Magnitude: 41.00 MG
Reported by: Buoy

Wind gusts up to 41 knots were measured at the Annapolis Buoy.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 18-JUL-12 16:15:00 to 18-JUL-12 16:41:00 (EST-5)
Location: GREENBERRY POINT
Magnitude: 42.00 MG
Reported by: Mesonet

Wind gusts up to 42 knots were measured at Greenberry Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 18-JUL-12 16:27:00 to 18-JUL-12 16:27:00 (EST-5)
Location: US NAVAL ACADEMY
Magnitude: 38.00 MG
Reported by: ASOS

A wind gust of 38 knots was measured at Annapolis.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 18-JUL-12 16:37:00 to 18-JUL-12 16:37:00 (EST-5)
Location: KENT ISLAND
Magnitude: 36.00 MG
Reported by: Mesonet

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

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 18-JUL-12 16:36:00 to 18-JUL-12 16:36:00 (EST-5)
Location: STEVENSVILLE
Magnitude: 40.00 MG
Reported by: Mesonet

A wind gust of 40 knots was measured at Stevensville.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 18-JUL-12 16:17:00 to 18-JUL-12 16:33:00 (EST-5)
Location: TOLLY POINT
Magnitude: 41.00 MG
Reported by: Mesonet

Wind gusts up to 41 knots were measured at Tolly Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 18-JUL-12 16:40:00 to 18-JUL-12 16:40:00 (EST-5)
Location: THOMAS POINT LIGHT
Magnitude: 36.00 MG
Reported by: Buoy

A wind gust of 36 knots was measured at the Thomas Point Lighthouse.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 18-JUL-12 16:30:00 to 18-JUL-12 16:30:00 (EST-5)
Location: SANDY POINT
Magnitude: 50.00 EG
Reported by: Unknown

Wind gusts around 50 knots were estimated due to thunderstorm wind damage nearby.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 18-JUL-12 18:51:00 to 18-JUL-12 18:51:00 (EST-5)
Location: BISHOPS HEAD
Magnitude: 34.00 MG
Reported by: Buoy

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

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 18-JUL-12 19:37:00 to 18-JUL-12 19:37:00 (EST-5)
Location: CRISFIELD
Magnitude: 38.00 MG
Reported by: Mesonet

A wind gust of 38 knots was reported at Crisfield.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 18-JUL-12 20:23:00 to 18-JUL-12 20:23:00 (EST-5)
Location: CRISFIELD
Magnitude: 38.00 MG
Reported by: Mesonet

A wind gust of 38 knots was measured at Crisfield.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 18-JUL-12 19:39:00 to 18-JUL-12 20:10:00 (EST-5)
Location: CRISFIELD
Magnitude: 52.00 MG
Reported by: Mesonet

Wind gusts up to 52 knots were reported at Crisfield.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 18-JUL-12 15:48:00 to 18-JUL-12 15:48:00 (EST-5)
Location: BALTIMORE APPROACHES BUOY
Magnitude: 34.00 EG
Reported by: Mesonet

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

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 18-JUL-12 18:54:00 to 18-JUL-12 19:06:00 (EST-5)
Location: BISHOPS HEAD
Magnitude: 36.00 MG
Reported by: Mesonet

Wind gusts up to 36 knots were measured at Bishops Head.