High pressure over the western Atlantic continued to usher in hot and humid air due to a southwest flow. An upper-level disturbance in the zonal flow triggered showers and thunderstorms across portions of the Tidal Potomac River and Chesapeake Bay. Moderate amounts of instability due to the hot and humid air mass caused some thunderstorms to produce gusty winds.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 18-JUL-10 21:52:00 to 18-JUL-10 22:27:00 (EST-5)
Location: SMITH ISLAND
Magnitude: 37.00 MG
Reported by: Mesonet

Wind gusts up to 37 knots were reported at Smith Island.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 18-JUL-10 22:54:00 to 18-JUL-10 23:00:00 (EST-5)
Location: MARYLAND SCIENCE CENTER
Magnitude: 34.00 EG
Reported by: Mesonet

Wind gusts in excess of 30 knots were reported near Baltimore.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 18-JUL-10 22:56:00 to 18-JUL-10 23:21:00 (EST-5)
Location: GREENBERRY POINT
Magnitude: 64.00 MG
Reported by: Mesonet

Wind gusts between 36 and 64 knots were reported at Greenbury Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 18-JUL-10 23:05:00 to 18-JUL-10 23:05:00 (EST-5)
Location: PATUXENT RIVER ASOS
Magnitude: 50.00 EG
Reported by: Trained Spotter

A wind gust was estimated around 50 knots due to thunderstorm wind damage near Bowley's Quarters.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 18-JUL-10 21:36:00 to 18-JUL-10 22:24:00 (EST-5)
Location: BISHOPS HEAD
Magnitude: 35.00 MG
Reported by: Mesonet

Wind gusts up to 35 knots were reported at Bishops Head.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 18-JUL-10 21:46:00 to 18-JUL-10 22:32:00 (EST-5)
Location: BISHOPS HEAD
Magnitude: 37.00 MG
Reported by: Mesonet

Wind gusts up to 37 knots were reported near Bishops Head.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 18-JUL-10 23:00:00 to 18-JUL-10 23:00:00 (EST-5)
Location: ANNAPOLIS
Magnitude: 43.00 MG
Reported by: Buoy

A wind gust of 43 knots was reported at Annapolis Buoy.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 18-JUL-10 23:00:00 to 18-JUL-10 23:12:00 (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 18-JUL-10 23:11:00 to 18-JUL-10 23:11:00 (EST-5)
Location: KENT ISLAND
Magnitude: 43.00 MG
Reported by: Mesonet

A wind gust of 43 knots was reported at Kent Island.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 18-JUL-10 23:18:00 to 18-JUL-10 23:18:00 (EST-5)
Location: KENT ISLAND
Magnitude: 34.00 MG
Reported by: Mesonet

A wind gust of 34 knots was reported at Kent Island.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 18-JUL-10 21:06:00 to 18-JUL-10 21:06:00 (EST-5)
Location: SMITH ISLAND
Magnitude: 34.00 EG
Reported by: Mesonet

A wind gust of 34 knots was estimated about two miles west of Smith Island.

Marine Thunderstorm Wind in CHESTER RIVER TO QUEENSTOWN MD, ATLANTIC NORTH
From 18-JUL-10 23:24:00 to 18-JUL-10 23:24:00 (EST-5)
Location: TOLCHESTER BEACH
Magnitude: 44.00 MG
Reported by: Buoy

A wind gust of 44 knots was reported at Tolchester Beach.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 18-JUL-10 22:59:00 to 18-JUL-10 22:59:00 (EST-5)
Location: THOMAS POINT LIGHT
Magnitude: 34.00 MG
Reported by: Buoy

A wind gust of 34 knots was reported at Thomas Point Lighthouse.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 18-JUL-10 23:00:00 to 18-JUL-10 23:00:00 (EST-5)
Location: PATAPSCO BUOY
Magnitude: 37.00 MG
Reported by: Buoy

A wind gust of 37 knots was reported at Patapsco Buoy.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 18-JUL-10 21:06:00 to 18-JUL-10 21:06:00 (EST-5)
Location: SMITH ISLAND
Magnitude: 34.00 MG
Reported by: Mesonet

A wind gust of 34 knots was reported at Smith Island.