A strong upper-level disturbance passed through the waters in a northwest flow aloft. Extremely hot and humid conditions caused high amounts of instability. The upper-level disturbance triggered a line of thunderstorms that moved through the waters. Due to the high instability, thunderstorms caused widespread gusty winds.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 29-JUN-12 22:05:00 to 29-JUN-12 22:05:00 (EST-5)
Location: PINEY POINT
Magnitude: 70.00 EG
Reported by: Unknown

A wind gust of 70 knots was estimated based on thunderstorm wind damage nearby.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 29-JUN-12 21:48:00 to 29-JUN-12 21:48:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 61.00 EG
Reported by: Unknown

A wind gust around 70 mph was estimated based on observations nearby.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 29-JUN-12 21:45:00 to 29-JUN-12 22:15:00 (EST-5)
Location: BABAR POINT
Magnitude: 71.00 MG
Reported by: Mesonet

Wind gusts up to 71 knots were measured at Baber Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 29-JUN-12 22:30:00 to 29-JUN-12 22:34:00 (EST-5)
Location: PATUXENT RIVER ASOS
Magnitude: 54.00 MG
Reported by: AWOS

Wind gusts up to 54 knots were measured at Patuxent River.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 29-JUN-12 22:22:00 to 29-JUN-12 22:22:00 (EST-5)
Location: BALTIMORE KEY BRIDGE
Magnitude: 61.00 EG
Reported by: Unknown

A wind gust of 61 knots was estimated based on thunderstorm wind damage nearby.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 29-JUN-12 22:18:00 to 29-JUN-12 22:18:00 (EST-5)
Location: CHESAPEAKE BEACH
Magnitude: 61.00 EG
Reported by: Unknown

A wind gust of 61 knots was estimated based on thunderstorm wind damage nearby.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 29-JUN-12 21:45:00 to 29-JUN-12 21:45:00 (EST-5)
Location: BABAR POINT
Magnitude: 71.00 MG
Reported by: Mesonet

A wind gust of 82 mph was reported near Dahlgren.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 29-JUN-12 23:12:00 to 29-JUN-12 23:12:00 (EST-5)
Location: CRISFIELD
Magnitude: 53.00 MG
Reported by: Mesonet

A wind gust of 61 mph near Smith Island.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 29-JUN-12 21:44:00 to 29-JUN-12 21:44:00 (EST-5)
Location: QUANTICO
Magnitude: 57.00 MG
Reported by: AWOS

A wind gust of 66 mph was measured near Quantico.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 29-JUN-12 22:09:00 to 29-JUN-12 22:30:00 (EST-5)
Location: TOLLY POINT
Magnitude: 41.00 MG
Reported by: Mesonet

Wind gusts up to 41 knots were measured at St. Annes School.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 29-JUN-12 21:47:00 to 29-JUN-12 22:00:00 (EST-5)
Location: LYLES-CROUCH ACADEMY ALEXANDRIA
Magnitude: 46.00 MG
Reported by: Buoy

Wind gusts up to 46 knots were reported at the Upper Potomac Buoy.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 29-JUN-12 23:13:00 to 29-JUN-12 23:59:00 (EST-5)
Location: KENT ISLAND
Magnitude: 42.00 MG
Reported by: Mesonet

Wind gusts up to 42 knots were measured at Kent Island.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 29-JUN-12 22:25:00 to 29-JUN-12 23:30:00 (EST-5)
Location: MID BAY BUOY
Magnitude: 50.00 MG
Reported by: Buoy

Wind gusts up to 50 knots were measured Gooses Reef.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 29-JUN-12 22:44:00 to 29-JUN-12 22:44:00 (EST-5)
Location: LOWER HOOPERS ISLAND
Magnitude: 49.00 MG
Reported by: Mesonet

Wind gusts up to 49 knots were reported at Lower Hoopers Island.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 29-JUN-12 22:35:00 to 29-JUN-12 22:45:00 (EST-5)
Location: POINT LOOKOUT
Magnitude: 52.00 MG
Reported by: Mesonet

Wind gusts up to 52 knots were reported at Point Lookout.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 29-JUN-12 23:13:00 to 29-JUN-12 23:13:00 (EST-5)
Location: RACCOON POINT
Magnitude: 46.00 MG
Reported by: Mesonet

A wind gust of 46 knots was measured at Raccoon Point.

Marine Thunderstorm Wind in CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER, ATLANTIC NORTH
From 29-JUN-12 22:42:00 to 29-JUN-12 22:54:00 (EST-5)
Location: CAMBRIDGE
Magnitude: 57.00 MG
Reported by: Buoy

Wind gusts up to 57 knots were reported at Cambridge.

Marine Thunderstorm Wind in CHESAPEAKE BAY N OF POOLES IS MD, ATLANTIC NORTH
From 29-JUN-12 22:50:00 to 29-JUN-12 23:20:00 (EST-5)
Location: SUSQUEHANNA
Magnitude: 37.00 MG
Reported by: Buoy

Wind gusts up to 37 knots were reported at the Susquehanna Buoy.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 30-JUN-12 01:06:00 to 30-JUN-12 01:06:00 (EST-5)
Location: BISHOPS HEAD
Magnitude: 34.00 EG
Reported by: Mesonet

Wind gusts in excess of 30 knots were measured at Bishops Head.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 29-JUN-12 21:49:00 to 29-JUN-12 21:49:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 43.00 MG
Reported by: Mesonet

A wind gust of 43 knots was reported.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 29-JUN-12 21:58:00 to 29-JUN-12 21:58:00 (EST-5)
Location: CUCKOLD CREEK
Magnitude: 63.00 MG
Reported by: Mesonet

A wind gust of 63 knots was reported at Cuckold Creek.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 29-JUN-12 22:28:00 to 29-JUN-12 22:28:00 (EST-5)
Location: CUCKOLD CREEK
Magnitude: 35.00 MG
Reported by: Mesonet

A wind gust of 35 knots was reported at Cuckold Creek.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 29-JUN-12 21:50:00 to 29-JUN-12 22:05:00 (EST-5)
Location: MONROE CREEK
Magnitude: 35.00 MG
Reported by: Mesonet

A wind gust of 35 knots was reported at Monroe Creek.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 29-JUN-12 21:45:00 to 29-JUN-12 22:15:00 (EST-5)
Location: BABAR POINT
Magnitude: 71.00 MG
Reported by: Mesonet

Wind gusts up to 71 knots were reported at Baber Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 29-JUN-12 22:15:00 to 29-JUN-12 23:10:00 (EST-5)
Location: PATAPSCO BUOY
Magnitude: 44.00 MG
Reported by: Buoy

Wind gusts up to 44 knots were reported at the Patapsco Buoy.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 29-JUN-12 22:15:00 to 29-JUN-12 23:00:00 (EST-5)
Location: ANNAPOLIS
Magnitude: 49.00 MG
Reported by: Buoy

Wind gusts up to 49 knots were reported at Annapolis.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 29-JUN-12 22:12:00 to 29-JUN-12 22:20:00 (EST-5)
Location: THOMAS POINT LIGHT
Magnitude: 49.00 MG
Reported by: Mesonet

Wind gusts up to 49 knots were reported at Herring Bay.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 29-JUN-12 22:09:00 to 29-JUN-12 22:39:00 (EST-5)
Location: US NAVAL ACADEMY
Magnitude: 41.00 MG
Reported by: Mesonet

Wind gusts up to 41 knots were reported at St. Mary's Elementary School.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 29-JUN-12 22:14:00 to 29-JUN-12 22:39:00 (EST-5)
Location: BALTIMORE CITY
Magnitude: 59.00 MG
Reported by: Mesonet

Wind gusts up to 59 knots were reported at the Hampstead Hill Elementary School.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 29-JUN-12 22:09:00 to 29-JUN-12 22:19:00 (EST-5)
Location: MARYLAND SCIENCE CENTER
Magnitude: 45.00 MG
Reported by: Mesonet

Wind gusts up to 45 knots were measured at the Maryland Science Center.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 29-JUN-12 22:45:00 to 29-JUN-12 22:54:00 (EST-5)
Location: RIVIERA BEACH
Magnitude: 42.00 MG
Reported by: Mesonet

Wind gusts up to 42 knots were measured at Sparrows Point High School.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 29-JUN-12 22:48:00 to 29-JUN-12 23:00:00 (EST-5)
Location: RIVIERA BEACH
Magnitude: 35.00 MG
Reported by: Mesonet

Wind gusts up to 35 knots was reported at the Francis Scott Key Bridge.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 29-JUN-12 22:18:00 to 29-JUN-12 22:26:00 (EST-5)
Location: KENT ISLAND
Magnitude: 49.00 MG
Reported by: Mesonet

Wind gusts up to 49 knots were measured at Kent Island.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 29-JUN-12 23:06:00 to 29-JUN-12 23:06:00 (EST-5)
Location: TOLCHESTER BEACH
Magnitude: 36.00 MG
Reported by: Mesonet

Wind gusts up to 36 knots were measured at Tolchester Beach.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 29-JUN-12 22:12:00 to 29-JUN-12 22:30:00 (EST-5)
Location: BALTIMORE CITY
Magnitude: 45.00 MG
Reported by: Mesonet

Wind gusts up to 45 knots were measured.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 29-JUN-12 22:42:00 to 29-JUN-12 22:54:00 (EST-5)
Location: COVE POINT
Magnitude: 42.00 MG
Reported by: Buoy

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

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 29-JUN-12 23:06:00 to 29-JUN-12 23:12:00 (EST-5)
Location: CRISFIELD
Magnitude: 53.00 MG
Reported by: Mesonet

Wind gusts up to 53 knots were reported at Crisfield.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 29-JUN-12 22:24:00 to 29-JUN-12 22:42:00 (EST-5)
Location: LEWISETTA
Magnitude: 41.00 MG
Reported by: Mesonet

Wind gusts up to 41 knots were reported at Lewisetta.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 29-JUN-12 22:20:00 to 29-JUN-12 22:20:00 (EST-5)
Location: THOMAS POINT LIGHT
Magnitude: 34.00 EG
Reported by: Buoy

A wind gust in excess of 30 knots was measured at the Thomas Point Lighthouse.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 29-JUN-12 21:49:00 to 29-JUN-12 21:49:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 43.00 MG
Reported by: Mesonet

A wind gust of 43 knots was measured at the Grace Episcopal School.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 29-JUN-12 22:40:00 to 29-JUN-12 23:10:00 (EST-5)
Location: POTOMAC BUOY
Magnitude: 49.00 MG
Reported by: Buoy

Wind gusts up to 49 knots were measured at Point Lookout.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 29-JUN-12 22:25:00 to 29-JUN-12 22:25:00 (EST-5)
Location: MARYLAND SCIENCE CENTER
Magnitude: 58.00 EG
Reported by: Mesonet

A wind gust of 58 knots was estimated based on observations nearby.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 29-JUN-12 22:06:00 to 29-JUN-12 22:06:00 (EST-5)
Location: WASHINGTON NATIONALS PARK
Magnitude: 35.00 MG
Reported by: Mesonet

A wind gust of 35 knots was reported.