High pressure over the western Atlantic pumped in plenty of warm and humid air on the 14th. An upper-level disturbance passed through the region during the afternoon and evening hours, bringing showers and thunderstorms. Moderate to high amounts of instability was present due to relatively colder air aloft and warm, moist air at the surface. This caused thunderstorms to become severe with large hail being the primary threat.

Hail in MONTGOMERY, MARYLAND
From 14-MAY-10 17:33:00 to 14-MAY-10 17:33:00 (EST-5)
Location: FRIENDSHIP HGTS
Magnitude: 1.00 
Reported by: Public

Hail to the size of quarters was reported at the intersection of Bethesda and Arlington Avenues.

Hail in PRINCE GEORGE'S, MARYLAND
From 14-MAY-10 17:45:00 to 14-MAY-10 17:45:00 (EST-5)
Location: GREENBELT
Magnitude: 1.00 
Reported by: CoCoRaHS

Quarter size hail was reported near Greenbelt.

Hail in BALTIMORE, MARYLAND
From 14-MAY-10 18:02:00 to 14-MAY-10 18:02:00 (EST-5)
Location: MARYLAND LINE
Magnitude: 1.75 
Reported by: Public

Golf ball sized hail was reported near Maryland Line.

Hail in PRINCE GEORGE'S, MARYLAND
From 14-MAY-10 18:05:00 to 14-MAY-10 18:05:00 (EST-5)
Location: ACCOKEEK
Magnitude: 1.00 
Reported by: Public

Quarter size hail was reported near Accokeek.

Hail in CHARLES, MARYLAND
From 14-MAY-10 18:10:00 to 14-MAY-10 18:10:00 (EST-5)
Location: WALDORF
Magnitude: 1.50 
Reported by: Trained Spotter

Hail to the size of ping pong balls was reported near Waldorf.

Hail in CHARLES, MARYLAND
From 14-MAY-10 18:12:00 to 14-MAY-10 18:12:00 (EST-5)
Location: WALDORF
Magnitude: 2.00 
Reported by: Trained Spotter

Hail two inches in diameter was reported near St. Charles.

Hail in CHARLES, MARYLAND
From 14-MAY-10 18:12:00 to 14-MAY-10 18:12:00 (EST-5)
Location: WALDORF
Magnitude: 1.25 
Property damage: 3.00K
Reported by: NWS Employee

Hail to the size of half dollars was reported in Waldorf. Some trees were uprooted and one was sheared off.

Hail in CHARLES, MARYLAND
From 14-MAY-10 18:15:00 to 14-MAY-10 18:15:00 (EST-5)
Location: MATTAWOMAN
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail was reported on MD-301 near Waldorf.

Hail in CHARLES, MARYLAND
From 14-MAY-10 18:18:00 to 14-MAY-10 18:18:00 (EST-5)
Location: WHITE PLAINS
Magnitude: 1.00 
Reported by: Fire Department/Rescue

Quarter size hail was reported in downtown Waldorf. Hail covered the ground.

Hail in CHARLES, MARYLAND
From 14-MAY-10 18:22:00 to 14-MAY-10 18:22:00 (EST-5)
Location: MATTAWOMAN
Magnitude: 1.50 
Reported by: Trained Spotter

Hail up to the size of ping pong balls was reported about one mile east-northeast of Waldorf.

Hail in ANNE ARUNDEL, MARYLAND
From 14-MAY-10 17:59:00 to 14-MAY-10 17:59:00 (EST-5)
Location: ODENTON
Magnitude: 1.25 
Reported by: Other Federal Agency

Hail was estimated to be the size of half dollars in Odenton.

Hail in CHARLES, MARYLAND
From 14-MAY-10 18:30:00 to 14-MAY-10 18:30:00 (EST-5)
Location: MATTAWOMAN
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail was reported about three miles east of Northwood.

Hail in BALTIMORE, MARYLAND
From 14-MAY-10 18:35:00 to 14-MAY-10 18:35:00 (EST-5)
Location: HALETHORPE
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail was reported near the intersection of Interstates 695 and 95.

Hail in CALVERT, MARYLAND
From 14-MAY-10 18:45:00 to 14-MAY-10 18:45:00 (EST-5)
Location: BARSTOW
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail was reported near Prince Frederick.

Thunderstorm Wind in CHARLES, MARYLAND
From 14-MAY-10 18:12:00 to 14-MAY-10 18:12:00 (EST-5)
Location: WALDORF
Magnitude: 55.00 EG
Property damage: 2.00K
Reported by: NWS Employee

Two trees were uprooted about three miles west-southwest of Waldorf.

Hail in BALTIMORE, MARYLAND
From 14-MAY-10 18:03:00 to 14-MAY-10 18:03:00 (EST-5)
Location: ROGERS FORGE
Magnitude: 1.00 
Reported by: Public

Quarter size hail was reported near Towson.

Hail in CHARLES, MARYLAND
From 14-MAY-10 18:22:00 to 14-MAY-10 18:22:00 (EST-5)
Location: BEANTOWN
Magnitude: 1.75 
Reported by: NWS Employee

Golf ball size hail was reported about four miles southeast of Waldorf.

Hail in CHARLES, MARYLAND
From 14-MAY-10 18:14:00 to 14-MAY-10 18:14:00 (EST-5)
Location: WALDORF
Magnitude: 1.75 
Property damage: 750.00K
Reported by: NWS Employee

Hail up to the size of golf balls was reported near Waldorf. Hundreds of cars around the Waldorf area were significantly damaged due to the large hail, including broken wind shields and dented bodies. There were also reports of damage to hundreds of homes as well.

Hail in CHARLES, MARYLAND
From 14-MAY-10 18:22:00 to 14-MAY-10 18:22:00 (EST-5)
Location: BEANTOWN
Magnitude: 1.75 
Reported by: Trained Spotter

Hail up to the size of golf balls was reported about three miles southeast of St. Charles.

Hail in BALTIMORE, MARYLAND
From 14-MAY-10 18:08:00 to 14-MAY-10 18:08:00 (EST-5)
Location: ROGERS FORGE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail up to the size of quarters was reported about one mile northeast of Towson.