A lee pressure trough ignited thunderstorms in a strongly unstable environment. The strongest thunderstorms produced severe downbursts and sporadic hail.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 10-AUG-21 17:48:00 to 10-AUG-21 17:48:00 (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 SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 10-AUG-21 17:48:00 to 10-AUG-21 17:48:00 (EST-5)
Location: GREENBURY POINT (GBY)
Magnitude: 34.00 EG
Reported by: Buoy

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

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 10-AUG-21 18:10:00 to 10-AUG-21 18:10:00 (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 10-AUG-21 18:10:00 to 10-AUG-21 18:10:00 (EST-5)
Location: THOMAS POINT (TPLM2)
Magnitude: 34.00 EG
Reported by: Buoy

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

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 10-AUG-21 18:07:00 to 10-AUG-21 18:12:00 (EST-5)
Location: HART MILLER ISLAND (HRT)
Magnitude: 40.00 MG
Reported by: Buoy

Wind gusts of up to 40 knots (46 MPH) were measured by a buoy near Hart Miller Island.

Marine Thunderstorm Wind in CHESAPEAKE BAY N OF POOLES IS MD, ATLANTIC NORTH
From 10-AUG-21 18:33:00 to 10-AUG-21 18:43:00 (EST-5)
Location: GROVE POINT (GVP)
Magnitude: 39.00 MG
Reported by: Buoy

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

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 10-AUG-21 19:30:00 to 10-AUG-21 19:30:00 (EST-5)
Location: GOOSES REEF BUOY (44062)
Magnitude: 43.00 MG
Reported by: Buoy

A wind gust of 43 knots (49 MPH) was measured by a buoy near Gooses Reef.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 10-AUG-21 16:35:00 to 10-AUG-21 16:35:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 37.00 MG
Reported by: ASOS

A wind gust of 37 knots (43 MPH) was measured by the ASOS at Ronald Reagan Washington National Airport (KDCA) adjacent to the upper tidal Potomac River.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 10-AUG-21 17:50:00 to 10-AUG-21 17:50:00 (EST-5)
Location: MARYLAND SCIENCE CENTER (BLMRE)
Magnitude: 35.00 MG
Reported by: Mesonet

A wind gust of 35 knots (40 MPH) was measured by a mesonet at the Maryland Science Center adjacent to Baltimore Inner Harbor.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 10-AUG-21 16:45:00 to 10-AUG-21 16:45:00 (EST-5)
Location: NATIONALS PARK (WSHNP)
Magnitude: 34.00 EG
Reported by: Mesonet

A thunderstorm produced an estimated wind gust to 34 knots (39 MPH) near a mesonet at Nationals Park adjacent to the upper tidal Potomac River.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 10-AUG-21 16:50:00 to 10-AUG-21 16:50:00 (EST-5)
Location: WASHINGTON DC (WASD2)
Magnitude: 34.00 EG
Reported by: Mesonet

A thunderstorm produced an estimated wind gust to 34 knots (39 MPH) near a mesonet near the Southwest Waterfront.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 10-AUG-21 17:02:00 to 10-AUG-21 17:10:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 39.00 MG
Reported by: ASOS

Wind gusts of up to 39 knots (45 MPH) were measured by the ASOS at Ronald Reagan Washington National Airport (KDCA) adjacent to the upper tidal Potomac River.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 10-AUG-21 17:10:00 to 10-AUG-21 17:10:00 (EST-5)
Location: NATIONALS PARK (WSHNP)
Magnitude: 34.00 EG
Reported by: Mesonet

A thunderstorm produced an estimated wind gust to 34 knots (39 MPH) near a mesonet at Nationals Park adjacent to the upper tidal Potomac River.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 10-AUG-21 17:45:00 to 10-AUG-21 17:50:00 (EST-5)
Location: ORIOLE PARK AT CAMDEN YARDS (BLTPC)
Magnitude: 36.00 MG
Reported by: Mesonet

Wind gusts of up to 36 knots (41 MPH) were measured by a mesonet at Oriole Park at Camden Yards adjacent to Baltimore Inner Harbor.