A cold front moved through the area. Ahead of the boundary, a southwest flow led to warm and humid conditions. The unstable atmosphere from warm and humid conditions along with stronger winds aloft caused some storms to become severe.

Hail in MONTGOMERY, MARYLAND
From 21-APR-17 15:42:00 to 21-APR-17 15:42:00 (EST-5)
Location: LUXMANOR
Magnitude: 1.00 
Reported by: Broadcast Media

Quarter sized hail was reported.

Hail in MONTGOMERY, MARYLAND
From 21-APR-17 15:47:00 to 21-APR-17 15:47:00 (EST-5)
Location: FRIENDSHIP HGTS
Magnitude: 1.50 
Reported by: Trained Spotter

Ping pong ball sized hail was reported.

Hail in MONTGOMERY, MARYLAND
From 21-APR-17 15:52:00 to 21-APR-17 15:52:00 (EST-5)
Location: NORTHWEST PARK
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter sized hail was reported at Piney Branch Road.

Hail in MONTGOMERY, MARYLAND
From 21-APR-17 15:49:00 to 21-APR-17 15:49:00 (EST-5)
Location: GEORGETOWN JCT
Magnitude: 1.00 
Reported by: Other Federal Agency

Quarter sized hail was reported.

Hail in MONTGOMERY, MARYLAND
From 21-APR-17 15:53:00 to 21-APR-17 15:53:00 (EST-5)
Location: TAKOMA PARK
Magnitude: 1.25 
Reported by: CoCoRaHS

Half dollar sized hail was reported.

Hail in MONTGOMERY, MARYLAND
From 21-APR-17 15:52:00 to 21-APR-17 15:52:00 (EST-5)
Location: GEORGETOWN JCT
Magnitude: 1.25 
Reported by: NWS Employee

Half dollar sized hail was reported at National Weather Service Headquarters.

Hail in MONTGOMERY, MARYLAND
From 21-APR-17 15:53:00 to 21-APR-17 15:53:00 (EST-5)
Location: TAKOMA PARK
Magnitude: 1.25 
Reported by: CoCoRaHS

Half dollar sized hail was reported.

Hail in MONTGOMERY, MARYLAND
From 21-APR-17 15:55:00 to 21-APR-17 15:55:00 (EST-5)
Location: TAKOMA PARK
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter sized hail was reported.

Hail in PRINCE GEORGE'S, MARYLAND
From 21-APR-17 16:12:00 to 21-APR-17 16:12:00 (EST-5)
Location: LANDOVER
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter sized hail was reported.

Hail in PRINCE GEORGE'S, MARYLAND
From 21-APR-17 16:44:00 to 21-APR-17 16:44:00 (EST-5)
Location: WELLS CORNER
Magnitude: 1.25 
Reported by: Fire Department/Rescue

Half dollar sized hail was reported.

Hail in CALVERT, MARYLAND
From 21-APR-17 18:49:00 to 21-APR-17 18:49:00 (EST-5)
Location: NORTH BEACH
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter sized hail was reported.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:34:00 to 21-APR-17 15:34:00 (EST-5)
Location: GLEN
Magnitude: 52.00 EG
Reported by: Emergency Manager

Trees and wires down at the 11200 Block of Gainsborough Road.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:36:00 to 21-APR-17 15:36:00 (EST-5)
Location: CARDEROCK SPGS
Magnitude: 52.00 EG
Reported by: Emergency Manager

Several large tree branches and wires were blocking the entire road near the intersection of Seven Locks Road and Bells Mill Road.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:40:00 to 21-APR-17 15:40:00 (EST-5)
Location: BETHESDA
Magnitude: 50.00 EG
Reported by: Emergency Manager

Several tree branches were down onto wires in the 6300 Block of Haviland Drive.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:42:00 to 21-APR-17 15:42:00 (EST-5)
Location: PARKSIDE
Magnitude: 52.00 EG
Reported by: Emergency Manager

Tree branches were down at the intersection of Montrose Avenue and Weymouth Street.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:43:00 to 21-APR-17 15:43:00 (EST-5)
Location: PARKWOOD
Magnitude: 52.00 EG
Reported by: Emergency Manager

Tree and wires were down on the 4500 Block of Woodfield Road.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:43:00 to 21-APR-17 15:43:00 (EST-5)
Location: PARKWOOD
Magnitude: 52.00 EG
Reported by: Emergency Manager

A tree was down blocking the Inner Loop of the Beltway near Maryland 355.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:43:00 to 21-APR-17 15:43:00 (EST-5)
Location: WOODHAVEN
Magnitude: 52.00 EG
Reported by: Emergency Manager

Tree branches were down on the left shoulder of the Capital Beltway.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:43:00 to 21-APR-17 15:43:00 (EST-5)
Location: KENSINGTON ESTATES
Magnitude: 52.00 EG
Reported by: Emergency Manager

Trees and wires were down partially blocking the intersection of University Boulevard West and Connecticut Avenue.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:44:00 to 21-APR-17 15:44:00 (EST-5)
Location: PARKWOOD
Magnitude: 52.00 EG
Reported by: Emergency Manager

A large tree was uprooted.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:46:00 to 21-APR-17 15:46:00 (EST-5)
Location: GEORGETOWN JCT
Magnitude: 52.00 EG
Reported by: Emergency Manager

A tree fell onto a house with wires down along Connecticut Avenue.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:47:00 to 21-APR-17 15:47:00 (EST-5)
Location: GEORGETOWN JCT
Magnitude: 52.00 EG
Reported by: Emergency Manager

A tree fell into a house along the 8500 Block of Lynwood Place.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:53:00 to 21-APR-17 15:53:00 (EST-5)
Location: TAKOMA PARK
Magnitude: 52.00 EG
Reported by: Emergency Manager

A half dozen large trees were uprooted along the 800 Block of Jackson Avenue. One injury was reported.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:54:00 to 21-APR-17 15:54:00 (EST-5)
Location: TAKOMA PARK
Magnitude: 52.00 EG
Reported by: Emergency Manager

Trees and wires were down blocking the intersection of Carroll Avenue and Grant Avenue.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:54:00 to 21-APR-17 15:54:00 (EST-5)
Location: TAKOMA PARK
Magnitude: 52.00 EG
Reported by: Emergency Manager

A tree fell onto a house at the 300 Block of Ethan Allen Avenue.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 21-APR-17 15:54:00 to 21-APR-17 15:54:00 (EST-5)
Location: TAKOMA PARK
Magnitude: 52.00 EG
Reported by: Emergency Manager

A tree fell into a house at the 1100 Block of Merwood Drive.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 21-APR-17 16:37:00 to 21-APR-17 16:37:00 (EST-5)
Location: UPPER MARLBORO
Magnitude: 52.00 EG
Reported by: Amateur Radio

Large trees were down on power lines near the intersection of Route 4 and Old Crain Highway.

Hail in PRINCE GEORGE'S, MARYLAND
From 21-APR-17 16:03:00 to 21-APR-17 16:03:00 (EST-5)
Location: BRANCHVILLE
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter sized hail was reported.

Hail in MONTGOMERY, MARYLAND
From 21-APR-17 15:54:00 to 21-APR-17 15:54:00 (EST-5)
Location: TAKOMA PARK
Magnitude: 1.75 
Reported by: Trained Spotter

Golf ball sized hail was reported.