A warm front was draped across the Mason-Dixon Line as a cold front slowly approached from the northwest, leaving the Mid Atlantic warm sectored. Increasing instability and shear ahead of the approaching front coupled with a passing jet streak providing forcing aloft led to scattered strong to severe thunderstorms.

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 20-APR-15 20:55:00 to 20-APR-15 20:55:00 (EST-5)
Location: THOMAS POINT LIGHT
Magnitude: 34.00 MG
Reported by: Mesonet

Marine Thunderstorm Wind in CHESAPEAKE BAY SANDY PT TO N BEACH MD, ATLANTIC NORTH
From 20-APR-15 20:53:00 to 20-APR-15 20:53:00 (EST-5)
Location: TOLLY POINT
Magnitude: 34.00 EG
Reported by: Mesonet

Between 33 and 34 knots were reported.

Waterspout in CHESAPEAKE BAY N BEACH TO DRUM PT MD, ATLANTIC NORTH
From 20-APR-15 19:53:00 to 20-APR-15 19:57:00 (EST-5)
Location: CHESAPEAKE BEACH
Reported by: Public

A water spout was reported via Just in Weather. The report included two videos from the public filming the water spout occurring off Plum Point, MD. Location and time were estimated from the videos and the use of radar data.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 20-APR-15 16:34:00 to 20-APR-15 16:34:00 (EST-5)
Location: WEST POTOMAC HIGH SCHOOL
Magnitude: 36.00 MG
Reported by: Mesonet

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 20-APR-15 19:15:00 to 20-APR-15 19:15:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 34.00 EG
Reported by: ASOS

Between 33 and 34 knots were reported at KDCA.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 20-APR-15 16:48:00 to 20-APR-15 16:48:00 (EST-5)
Location: WASHINGTON NATIONALS PARK
Magnitude: 34.00 MG
Reported by: Mesonet

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 20-APR-15 16:54:00 to 20-APR-15 16:54:00 (EST-5)
Location: WASHINGTON NATIONALS PARK
Magnitude: 34.00 EG
Reported by: Mesonet

Between 31 and 34 knots was reported.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 20-APR-15 19:20:00 to 20-APR-15 19:20:00 (EST-5)
Location: LYLES-CROUCH ACADEMY ALEXANDRIA
Magnitude: 34.00 EG
Reported by: Buoy

Between 31 and 34 knots were reported at the Upper Potomac Buoy (44061).

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 20-APR-15 19:10:00 to 20-APR-15 19:10:00 (EST-5)
Location: LYLES-CROUCH ACADEMY ALEXANDRIA
Magnitude: 34.00 EG
Reported by: Mesonet

Between 32 and 34 knots were reported at TC Williams HS.

Marine Thunderstorm Wind in CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER, ATLANTIC NORTH
From 20-APR-15 19:27:00 to 20-APR-15 19:27:00 (EST-5)
Location: HORN POINT
Magnitude: 39.00 MG
Reported by: Mesonet

Marine Thunderstorm Wind in CHESAPEAKE BAY N OF POOLES IS MD, ATLANTIC NORTH
From 20-APR-15 21:00:00 to 20-APR-15 21:00:00 (EST-5)
Location: SUSQUEHANNA
Magnitude: 41.00 MG
Reported by: Buoy

Reported at Susquehanna Buoy (44057).

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 20-APR-15 19:46:00 to 20-APR-15 19:46:00 (EST-5)
Location: QUANTICO
Magnitude: 38.00 MG
Reported by: AWOS

Reported at knyg.

Marine Thunderstorm Wind in TIDAL POTOMAC KEY BRIDGE TO INDIAN HD MD, ATLANTIC NORTH
From 20-APR-15 16:43:00 to 20-APR-15 16:43:00 (EST-5)
Location: (DCA)REAGAN NATIONAL AIRPORT
Magnitude: 35.00 MG
Reported by: ASOS

Marine Thunderstorm Wind in TIDAL POTOMAC INDIAN HD TO COBB IS MD, ATLANTIC NORTH
From 20-APR-15 19:02:00 to 20-APR-15 19:02:00 (EST-5)
Location: QUANTICO
Magnitude: 47.00 MG
Reported by: Mesonet

Reported at Mason Neck WXFlow Site.

Marine Thunderstorm Wind in CHESAPEAKE BAY POOLES IS TO SANDY PT MD, ATLANTIC NORTH
From 20-APR-15 20:30:00 to 20-APR-15 20:30:00 (EST-5)
Location: MILLER ISLAND
Magnitude: 35.00 MG
Reported by: Mesonet