A lee pressure trough and weak cold front combined to ignite numerous thunderstorms in a strongly unstable environment. The strongest thunderstorms produced severe wind gusts and sporadic hail.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 11-AUG-21 15:56:00 to 11-AUG-21 15:58:00 (EST-5)
Location: QUANTICO (KNYG)
Magnitude: 38.00 MG
Reported by: ASOS

Wind gusts of up to 38 knots (44 MPH) were measured by the ASOS at Quantico Marine Base adjacent to the tidal Potomac River.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 11-AUG-21 16:27:00 to 11-AUG-21 16:32:00 (EST-5)
Location: BABER POINT (BAB)
Magnitude: 39.00 MG
Reported by: Buoy

Wind gusts of up to 39 knots (45 MPH) were measured by a buoy near Baber Point.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 11-AUG-21 16:32:00 to 11-AUG-21 16:32:00 (EST-5)
Location: BABER POINT (BAB)
Magnitude: 34.00 EG
Reported by: Buoy

A thunderstorm produced an estimated wind gust to 34 knots (39 MPH) near a buoy near Dahlgren.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 11-AUG-21 16:33:00 to 11-AUG-21 16:33:00 (EST-5)
Location: POTOMAC LIGHT 33 (LT3)
Magnitude: 35.00 MG
Reported by: Buoy

A wind gust of 35 knots (40 MPH) was measured by a buoy near Potomac Light.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 11-AUG-21 16:38:00 to 11-AUG-21 16:43:00 (EST-5)
Location: CUCKOLD CREEK (CCK)
Magnitude: 34.00 MG
Reported by: Buoy

A wind gust of 34 knots (39 MPH) was measured by a buoy near Cuckold Creek.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 11-AUG-21 16:42:00 to 11-AUG-21 16:54:00 (EST-5)
Location: BALTIMORE KEY BRIDGE (FSKM2)
Magnitude: 42.00 MG
Reported by: Buoy

Wind gusts of up to 42 knots (48 MPH) were measured by a buoy near Francis Scott Key Bridge.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 11-AUG-21 16:48:00 to 11-AUG-21 16:48:00 (EST-5)
Location: BALTIMORE (BLTM2)
Magnitude: 34.00 EG
Reported by: Buoy

A thunderstorm produced an estimated wind gust to 34 knots (39 MPH) near a buoy in Baltimore Inner Harbor.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 11-AUG-21 16:52:00 to 11-AUG-21 16:52:00 (EST-5)
Location: BABER POINT (BAB)
Magnitude: 34.00 EG
Reported by: Buoy

A thunderstorm produced an estimated wind gust to 34 knots (39 MPH) near a buoy near Dahlgren.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 11-AUG-21 17:00:00 to 11-AUG-21 17:10:00 (EST-5)
Location: HART MILLER ISLAND (HRT)
Magnitude: 34.00 EG
Reported by: Buoy

A thunderstorm produced estimated wind gusts to 34 knots (39 MPH) near a buoy near Hart Miller Island.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 11-AUG-21 17:12:00 to 11-AUG-21 17:30:00 (EST-5)
Location: TOLCHESTER MD (TCBM2)
Magnitude: 36.00 MG
Reported by: Buoy

Wind gusts of up to 36 knots (41 MPH) were measured by a buoy near Tolchester Beach.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 11-AUG-21 17:21:00 to 11-AUG-21 17:21:00 (EST-5)
Location: ANNAPOLIS (KNAK)
Magnitude: 34.00 EG
Reported by: ASOS

A thunderstorm produced an estimated wind gust to 34 knots (39 MPH) near the ASOS at the U.S. Naval Academy adjacent to the Chesapeake Bay.

Marine Thunderstorm Wind in CHESAPEAKE BAY N OF POOLES IS MD, ATLANTIC NORTH
From 11-AUG-21 17:26:00 to 11-AUG-21 17:46:00 (EST-5)
Location: GROVE POINT (GVP)
Magnitude: 37.00 MG
Reported by: Buoy

Wind gusts of up to 37 knots (43 MPH) were measured by a buoy near Grove Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 11-AUG-21 17:30:00 to 11-AUG-21 17:30:00 (EST-5)
Location: THOMAS POINT (TPLM2)
Magnitude: 40.00 MG
Reported by: Buoy

A wind gust of 40 knots (46 MPH) was measured by a buoy near Thomas Point.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 11-AUG-21 17:30:00 to 11-AUG-21 17:30:00 (EST-5)
Location: THOMAS POINT (TPLM2)
Magnitude: 45.00 MG
Reported by: Buoy

A wind gust of 45 knots (52 MPH) was measured by a buoy near Saunders Point Light.

Marine Thunderstorm Wind in TIDAL POTOMAC COBB IS MD TO SMITH PT VA, ATLANTIC NORTH
From 11-AUG-21 18:39:00 to 11-AUG-21 18:39:00 (EST-5)
Location: POINT LOOKOUT (PTL)
Magnitude: 35.00 MG
Reported by: Buoy

A wind gust of 35 knots (40 MPH) was measured by a buoy near Point Lookout.