A pre-frontal trough and approaching cold front ignited multiple rounds of severe thunderstorms during the afternoon and evening hours. Some thunderstorms produced significant microbursts.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 26-MAY-21 16:14:00 to 26-MAY-21 16:16:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 46.00 MG
Reported by: ASOS

Wind gusts of up to 46 knots (53 MPH) were measured by the ASOS at Ronald Reagan Washington National Airport adjacent to the upper tidal Potomac River.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 26-MAY-21 16:18:00 to 26-MAY-21 16:24:00 (EST-5)
Location: WASHINGTON DC (WASD2)
Magnitude: 34.00 EG
Reported by: Buoy

A thunderstorm produced estimated wind gusts up to 34 knots (39 MPH) near a buoy in Washington Channel.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 26-MAY-21 16:40:00 to 26-MAY-21 16:40:00 (EST-5)
Location: LONG BRANCH ES (ARLNL)
Magnitude: 34.00 EG
Reported by: Mesonet

A thunderstorm produced an estimated wind gust to 34 knots (39 MPH) near a mesonet near Hoffman-Boston Elementary School in Arlington adjacent to the upper tidal Potomac River.

Marine Thunderstorm Wind in CHESAPEAKE BAY N OF POOLES IS MD, ATLANTIC NORTH
From 26-MAY-21 17:42:00 to 26-MAY-21 17:42:00 (EST-5)
Location: GROVE POINT (GVP)
Magnitude: 34.00 EG
Reported by: Buoy

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

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 26-MAY-21 17:15:00 to 26-MAY-21 17:15:00 (EST-5)
Location: BALTIMORE KEY BRIDGE (FSKM2)
Magnitude: 36.00 MG
Reported by: Buoy

A wind gust of 36 knots (41 MPH) was measured by a buoy near Francis Scott Key Bridge.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 26-MAY-21 19:25:00 to 26-MAY-21 19:25:00 (EST-5)
Location: ORIOLE PARK AT CAMDEN YARDS (BLTPC)
Magnitude: 47.00 MG
Reported by: Mesonet

A wind gust of 47 knots (54 MPH) was measured by a mesonet at Oriole Park at Camden Yards adjacent to Baltimore Inner Harbor.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 26-MAY-21 19:25:00 to 26-MAY-21 19:35:00 (EST-5)
Location: HAMPSTEAD HILL ACADEMY (BLMHH)
Magnitude: 34.00 MG
Reported by: Mesonet

Wind gusts of up to 34 knots (39 MPH) were measured by a mesonet at Hampstead Hill Academy adjacent to Baltimore Inner Harbor.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 26-MAY-21 19:25:00 to 26-MAY-21 19:25:00 (EST-5)
Location: WASHINGTON DC (WASD2)
Magnitude: 42.00 MG
Reported by: Buoy

A wind gust of 42 knots (48 MPH) was measured by a buoy in Washington Channel.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 26-MAY-21 19:30:00 to 26-MAY-21 19:42:00 (EST-5)
Location: BALTIMORE KEY BRIDGE (FSKM2)
Magnitude: 36.00 MG
Reported by: Buoy

Wind gusts of up to 36 knots (41 MPH) were measured by a buoy near Francis Scott Key Bridge.

Marine Thunderstorm Wind in PATAPSCO RIVER INCLUDING BALTIMORE HARBOR, ATLANTIC NORTH
From 26-MAY-21 19:35:00 to 26-MAY-21 19:35:00 (EST-5)
Location: MARYLAND SCIENCE CENTER (BLMRE)
Magnitude: 38.00 MG
Reported by: Mesonet

A wind gust of 38 knots (44 MPH) was measured by a mesonet at Maryland Science Center adjacent to Baltimore Inner Harbor.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 26-MAY-21 19:36:00 to 26-MAY-21 19:36:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 34.00 EG
Reported by: ASOS

A thunderstorm produced an estimated wind gust to 34 knots (39 MPH) near the ASOS at Ronald Reagan Washington National Airport adjacent to the upper tidal Potomac River.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 26-MAY-21 19:39:00 to 26-MAY-21 19:49:00 (EST-5)
Location: HART MILLER ISLAND (HRT)
Magnitude: 38.00 MG
Reported by: Buoy

Wind gusts of up to 38 knots (44 MPH) were measured by a buoy near Hart Miller Island.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 26-MAY-21 19:40:00 to 26-MAY-21 19:40:00 (EST-5)
Location: NATIONALS PARK (WSHNP)
Magnitude: 39.00 MG
Reported by: Mesonet

A wind gust of 39 knots (45 MPH) was measured by a mesonet at Nationals Park near the upper tidal Potomac River.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 26-MAY-21 20:00:00 to 26-MAY-21 20:00:00 (EST-5)
Location: TOLCHESTER MD (TCBM2)
Magnitude: 34.00 EG
Reported by: Buoy

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

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 26-MAY-21 20:00:00 to 26-MAY-21 20:00:00 (EST-5)
Location: WASHINGTON DC (WASD2)
Magnitude: 42.00 MG
Reported by: Buoy

A wind gust of 42 knots (48 MPH) was measured by a buoy in Washington Channel.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 26-MAY-21 20:03:00 to 26-MAY-21 20:13:00 (EST-5)
Location: LEESYLVANIA STATE PARK (LSLVN)
Magnitude: 72.00 MG
Reported by: Buoy

Wind gusts of up to 72 knots (83 MPH) were measured by a buoy in Occoquan Bay.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 26-MAY-21 20:08:00 to 26-MAY-21 20:08:00 (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 Thomas Point.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 26-MAY-21 20:23:00 to 26-MAY-21 20:25:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 34.00 MG
Reported by: ASOS

Wind gusts of up to 34 knots (39 MPH) were measured by the ASOS at Ronald Reagan Washington National Airport adjacent to the upper tidal Potomac River.

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 26-MAY-21 20:30:00 to 26-MAY-21 20:40:00 (EST-5)
Location: POTOMAC LIGHT 33 (LT3)
Magnitude: 37.00 MG
Reported by: Buoy

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

Marine Thunderstorm Wind in CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER, ATLANTIC NORTH
From 26-MAY-21 20:30:00 to 26-MAY-21 20:30:00 (EST-5)
Location: BLACKWALNUT HARBOR (BWH)
Magnitude: 34.00 EG
Reported by: Buoy

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

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 26-MAY-21 20:36:00 to 26-MAY-21 20:36:00 (EST-5)
Location: GOOSES REEF BUOY (44062)
Magnitude: 34.00 EG
Reported by: Buoy

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

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 26-MAY-21 21:06:00 to 26-MAY-21 21:06:00 (EST-5)
Location: GOOSES REEF BUOY (44062)
Magnitude: 34.00 EG
Reported by: Buoy

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

Marine Thunderstorm Wind in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 26-MAY-21 21:00:00 to 26-MAY-21 21:00:00 (EST-5)
Location: MID BAY BUOY
Magnitude: 34.00 EG
Reported by: Buoy

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