A cold front passed through the area. At the same time, an upper-level trough passed through increasing the winds aloft. There was enough shear to combine with an unstable atmosphere for gusty thunderstorms to develop.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-JUL-17 15:46:00 to 14-JUL-17 15:46:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 50.00 EG
Reported by: Trained Spotter

A wind gust of 50 knots was estimated due to thunderstorm wind damage nearby.

Marine Thunderstorm Wind in CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER, ATLANTIC NORTH
From 14-JUL-17 17:40:00 to 14-JUL-17 17:40:00 (EST-5)
Location: HORN POINT LAB (HPLWS)
Magnitude: 50.00 EG
Reported by: Unknown

A wind gust of 50 knots was estimated based on thunderstorm wind damage nearby.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 14-JUL-17 16:40:00 to 14-JUL-17 16:40:00 (EST-5)
Location: ANNAPOLIS BUOY (44063)
Magnitude: 34.00 EG
Reported by: Buoy

Wind gusts in excess of 30 knots were reported at the Annapolis Buoy.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 14-JUL-17 16:55:00 to 14-JUL-17 17:05:00 (EST-5)
Location: BABAR POINT (BAB)
Magnitude: 34.00 EG
Reported by: Buoy

Wind gusts in excess of 30 knots were reported at Pylons.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 14-JUL-17 15:08:00 to 14-JUL-17 15:08:00 (EST-5)
Location: HART MILLER ISLAND (HRT)
Magnitude: 34.00 EG
Reported by: Buoy

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

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 14-JUL-17 15:24:00 to 14-JUL-17 15:24:00 (EST-5)
Location: TOLCHESTER MD (TCBM2)
Magnitude: 46.00 MG
Reported by: Buoy

A wind gust in excess of 46 knots was reported at Tolchester Beach.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 14-JUL-17 16:29:00 to 14-JUL-17 16:29:00 (EST-5)
Location: GREENBERRY POINT (GBY)
Magnitude: 38.00 MG
Reported by: Buoy

A wind gust of 38 knots was reported at Greenberry Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 14-JUL-17 16:30:00 to 14-JUL-17 16:30:00 (EST-5)
Location: ANNAPOLIS BUOY (44063)
Magnitude: 37.00 MG
Reported by: Buoy

A wind gust of 37 knots was reported at the Annapolis Buoy.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-JUL-17 15:35:00 to 14-JUL-17 15:49:00 (EST-5)
Location: ALEXANDRIA COUNTRY DAY (ALXNC)
Magnitude: 37.00 MG
Reported by: Mesonet

Wind gusts of 35 to 37 knots were reported.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-JUL-17 15:36:00 to 14-JUL-17 15:54:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 42.00 MG
Reported by: ASOS

Wind gusts of 37 to 42 knots were reported at Reagan National.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-JUL-17 15:39:00 to 14-JUL-17 15:39:00 (EST-5)
Location: GEORGE MASON ES (ALXD2)
Magnitude: 34.00 EG
Reported by: Mesonet

A wind gusts in excess of 30 knots was reported.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-JUL-17 15:40:00 to 14-JUL-17 15:45:00 (EST-5)
Location: LONG BRANCH ES (ARLNL)
Magnitude: 46.00 MG
Reported by: Mesonet

Wind gusts of 37 to 46 knots were measured.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-JUL-17 15:42:00 to 14-JUL-17 15:48:00 (EST-5)
Location: WASHINGTON DC (WASD2)
Magnitude: 34.00 EG
Reported by: Mesonet

Wind gusts in excess of 30 knots were reported.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-JUL-17 15:44:00 to 14-JUL-17 15:59:00 (EST-5)
Location: NATIONALS PARK (WSHNP)
Magnitude: 40.00 MG
Reported by: Mesonet

Wind gusts of 37 to 40 knots were reported at Nationals Park.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-JUL-17 15:48:00 to 14-JUL-17 15:48:00 (EST-5)
Location: UPPER POTOMAC BUOY (44061)
Magnitude: 34.00 EG
Reported by: Buoy

A wind gust in excess of 30 knots was reported at the Upper Potomac Buoy.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 14-JUL-17 15:54:00 to 14-JUL-17 15:54:00 (EST-5)
Location: GRACE EPISCOPAL SCHOOL (ALXGE)
Magnitude: 36.00 MG
Reported by: Mesonet

A wind gusts of 36 knots was reported.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 14-JUL-17 16:20:00 to 14-JUL-17 16:20:00 (EST-5)
Location: BABAR POINT (BAB)
Magnitude: 39.00 MG
Reported by: Buoy

A wind gusts of 39 knots was reported at Pylons.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 14-JUL-17 16:29:00 to 14-JUL-17 16:29:00 (EST-5)
Location: WASHINGTON DISTRICT COLONIAL BEACH (CLNLB)
Magnitude: 34.00 EG
Reported by: Mesonet

Wind gusts in excess of 30 knots were reported.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 14-JUL-17 16:37:00 to 14-JUL-17 16:42:00 (EST-5)
Location: CUCKOLD CREEK (CCK)
Magnitude: 39.00 MG
Reported by: Buoy

Wind gusts of 36 to 39 knots were reported at Cuckold Creek.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 14-JUL-17 16:38:00 to 14-JUL-17 16:43:00 (EST-5)
Location: MONROE CREEK (MON)
Magnitude: 40.00 MG
Reported by: Buoy

Wind gusts of 36 to 40 knots were reported at Monroe Creek.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 14-JUL-17 16:31:00 to 14-JUL-17 16:36:00 (EST-5)
Location: TOLLY POINT (TOL)
Magnitude: 37.00 MG
Reported by: Buoy

Wind gusts of 36 to 37 knots were reported at Tolly Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 14-JUL-17 17:00:00 to 14-JUL-17 17:00:00 (EST-5)
Location: THOMAS POINT (TPLM2)
Magnitude: 41.00 MG
Reported by: Buoy

A wind gust of 41 knots was measured at Thomas Point.

Marine Thunderstorm Wind in CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER, ATLANTIC NORTH
From 14-JUL-17 17:01:00 to 14-JUL-17 17:01:00 (EST-5)
Location: BLACKWALNUT HARBOR (BWH)
Magnitude: 34.00 EG
Reported by: Buoy

Wind gusts in excess of 30 knots were reported.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 14-JUL-17 17:36:00 to 14-JUL-17 17:48:00 (EST-5)
Location: MID BAY BUOY
Magnitude: 42.00 MG
Reported by: Buoy

Wind gusts up to 42 knots were measured Cove Point.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 14-JUL-17 16:48:00 to 14-JUL-17 17:13:00 (EST-5)
Location: MONROE CREEK (MON)
Magnitude: 36.00 MG
Reported by: Buoy

Wind gusts up to 36 knots were reported at Monroe Creek.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 14-JUL-17 16:48:00 to 14-JUL-17 16:58:00 (EST-5)
Location: POTOMAC LIGHT 33 (LT3)
Magnitude: 36.00 MG
Reported by: Buoy

Wind gusts up to 35 knots were reported at Potomac Light.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 14-JUL-17 17:05:00 to 14-JUL-17 17:05:00 (EST-5)
Location: BABAR POINT (BAB)
Magnitude: 34.00 EG
Reported by: Buoy

Wind gusts in excess of 30 knots were reported at Baber Point.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 14-JUL-17 17:12:00 to 14-JUL-17 17:12:00 (EST-5)
Location: CUCKOLD CREEK (CCK)
Magnitude: 34.00 EG
Reported by: Buoy

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

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 14-JUL-17 16:40:00 to 14-JUL-17 16:40:00 (EST-5)
Location: PATAPSCO BUOY (44043)
Magnitude: 37.00 MG
Reported by: Buoy

A wind gust of 37 knots was reported.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 14-JUL-17 16:49:00 to 14-JUL-17 17:34:00 (EST-5)
Location: COBB POINT (COB)
Magnitude: 35.00 MG
Reported by: Buoy

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

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 14-JUL-17 17:42:00 to 14-JUL-17 18:00:00 (EST-5)
Location: PINEY POINT (PPTM2)
Magnitude: 44.00 MG
Reported by: Buoy

Wind gusts of 34 to 44 knots were reported at Piney Point.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 14-JUL-17 17:54:00 to 14-JUL-17 18:24:00 (EST-5)
Location: LEWISETTA (LWS)
Magnitude: 42.00 MG
Reported by: Buoy

Wind gusts up to 42 knots were reported at Lewisetta.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 14-JUL-17 17:54:00 to 14-JUL-17 18:24:00 (EST-5)
Location: LEWISETTA MD (LWTV2)
Magnitude: 42.00 MG
Reported by: Mesonet

Wind gusts up to 42 knots were reported at Lewisetta.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 14-JUL-17 17:55:00 to 14-JUL-17 17:55:00 (EST-5)
Location: ST INIGOES (KNUI)
Magnitude: 38.00 MG
Reported by: AWOS

A wind gusts of 38 knots was reported at St. Inigoes.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 14-JUL-17 18:00:00 to 14-JUL-17 18:25:00 (EST-5)
Location: POINT LOOKOUT (PTL)
Magnitude: 49.00 MG
Reported by: Buoy

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

Marine Thunderstorm Wind in CHESAPEAKE BAY DRUM PT TO SMITH PT VA, ATLANTIC NORTH
From 14-JUL-17 17:43:00 to 14-JUL-17 17:47:00 (EST-5)
Location: PATUXENT RIVER ASOS (KNAK)
Magnitude: 42.00 MG
Reported by: Buoy

Wind gusts of 37 to 42 knots were reported at Patuxent River (KNHK).

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 14-JUL-17 18:16:00 to 14-JUL-17 18:26:00 (EST-5)
Location: LOWER HOOPERS ISLAND (HPR)
Magnitude: 38.00 MG
Reported by: Buoy

Wind gusts up to 38 knots were reported at Hooper Island.

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 14-JUL-17 18:20:00 to 14-JUL-17 18:20:00 (EST-5)
Location: GOOSES REEF BUOY (44062)
Magnitude: 37.00 MG
Reported by: Buoy

A wind gust of 37 knots was reported at Gooses Reef.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 14-JUL-17 18:29:00 to 14-JUL-17 18:29:00 (EST-5)
Location: RACCOON POINT (RAC)
Magnitude: 34.00 MG
Reported by: Buoy

A wind gust of 34 knots was reported at Raccoon Point.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 14-JUL-17 18:30:00 to 14-JUL-17 18:30:00 (EST-5)
Location: BISHOPS HEAD (BISM2)
Magnitude: 34.00 EG
Reported by: Buoy

A wind gusts in excess of 30 knots was reported at Bishops Head.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 14-JUL-17 18:39:00 to 14-JUL-17 18:54:00 (EST-5)
Location: RACCOON POINT (RAC)
Magnitude: 42.00 MG
Reported by: Buoy

Wind gusts up to 42 knots were reported at Raccoon Point.

Marine Thunderstorm Wind in TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND, ATLANTIC NORTH
From 14-JUL-17 18:41:00 to 14-JUL-17 18:46:00 (EST-5)
Location: CRISFIELD CG (CRS)
Magnitude: 41.00 MG
Reported by: Buoy

Wind gusts up to 41 knots were reported at Crisfield.