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 FAIRFAX, VIRGINIA
From 14-MAY-10 17:25:00 to 14-MAY-10 17:25:00 (EST-5)
Location: RESTON
Magnitude: 1.25 
Reported by: Trained Spotter

Half dollar size hail was reported near Reston.

Hail in FAIRFAX, VIRGINIA
From 14-MAY-10 17:25:00 to 14-MAY-10 17:25:00 (EST-5)
Location: TYSONS CORNER
Magnitude: 1.00 
Reported by: Trained Spotter

Hail up to the size of quarters was reported in Tysons Corner.

Hail in FAIRFAX, VIRGINIA
From 14-MAY-10 17:25:00 to 14-MAY-10 17:25:00 (EST-5)
Location: KENMORE
Magnitude: 2.00 
Reported by: CoCoRaHS

Hail estimated to be about two inches in diameter fell about three miles north of Vienna.

Hail in ARLINGTON, VIRGINIA
From 14-MAY-10 17:40:00 to 14-MAY-10 17:40:00 (EST-5)
Location: ARLINGTON
Magnitude: 1.00 
Reported by: Trained Spotter

Hail to the size of quarters was measured about one mile west from the intersection of Glebe Road and Wilson Boulevard.

Hail in PRINCE WILLIAM, VIRGINIA
From 14-MAY-10 17:26:00 to 14-MAY-10 17:26:00 (EST-5)
Location: BUCKHALL
Magnitude: 1.00 
Reported by: Trained Spotter

Hail up to the size of quarters was reported about three miles east-southeast of Manassas.

Hail in ALBEMARLE, VIRGINIA
From 14-MAY-10 19:12:00 to 14-MAY-10 19:12:00 (EST-5)
Location: BOYD TAVERN
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail was reported about one mile south of Boyd Tavern.

Hail in PAGE, VIRGINIA
From 14-MAY-10 17:42:00 to 14-MAY-10 17:42:00 (EST-5)
Location: MARKSVILLE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail up to the size of quarters was reported about two miles east-southeast of Stanley.

Hail in PRINCE WILLIAM, VIRGINIA
From 14-MAY-10 17:28:00 to 14-MAY-10 17:28:00 (EST-5)
Location: RIXLEW
Magnitude: 1.00 
Reported by: Trained Spotter

Hail up to the size of quarters was reported about two miles west-southwest of Manassas.

Hail in FAIRFAX, VIRGINIA
From 14-MAY-10 17:08:00 to 14-MAY-10 17:08:00 (EST-5)
Location: CHANTILLY
Magnitude: 1.00 
Reported by: Trained Spotter

Hail up to the size of quarters was reported near Chantilly.

Hail in FAIRFAX, VIRGINIA
From 14-MAY-10 17:15:00 to 14-MAY-10 17:15:00 (EST-5)
Location: FLORIS
Magnitude: 1.00 
Reported by: Amateur Radio

Hail up to the size of quarters was measured about three miles northeast of Chantilly.

Hail in PRINCE WILLIAM, VIRGINIA
From 14-MAY-10 17:22:00 to 14-MAY-10 17:22:00 (EST-5)
Location: RIXLEW
Magnitude: 1.00 
Reported by: Amateur Radio

Hail up to the size of quarters was reported about one mile south-southeast of Manassas.

Hail in PRINCE WILLIAM, VIRGINIA
From 14-MAY-10 17:25:00 to 14-MAY-10 17:25:00 (EST-5)
Location: LONGVIEW
Magnitude: 1.50 
Reported by: Trained Spotter

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

Hail in FAIRFAX, VIRGINIA
From 14-MAY-10 17:25:00 to 14-MAY-10 17:25:00 (EST-5)
Location: CHESTERBROOK WOODS
Magnitude: 1.00 
Reported by: Trained Spotter

Hail to the size of quarters was reported in Mclean.

Hail in PRINCE WILLIAM, VIRGINIA
From 14-MAY-10 16:52:00 to 14-MAY-10 16:52:00 (EST-5)
Location: HAYMARKET
Magnitude: 1.75 
Reported by: Public

Hail was estimated to be the size of golf balls in Haymarket.

Hail in PRINCE WILLIAM, VIRGINIA
From 14-MAY-10 16:50:00 to 14-MAY-10 16:50:00 (EST-5)
Location: BUCKLAND
Magnitude: 1.50 
Reported by: Public

Hail up to the size of ping pongs was reported about two miles southwest of Haymarket.

Hail in PRINCE WILLIAM, VIRGINIA
From 14-MAY-10 17:05:00 to 14-MAY-10 17:05:00 (EST-5)
Location: GAINESVILLE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail was estimated to be the size of quarters about two miles southeast of Haymarket.

Hail in FAIRFAX, VIRGINIA
From 14-MAY-10 17:12:00 to 14-MAY-10 17:12:00 (EST-5)
Location: PENDER
Magnitude: 1.00 
Reported by: Trained Spotter

Hail was estimated to be the size of quarters about two miles east-southeast of Chantilly.

Hail in FAIRFAX, VIRGINIA
From 14-MAY-10 17:13:00 to 14-MAY-10 17:13:00 (EST-5)
Location: CHANTILLY
Magnitude: 1.25 
Reported by: NWS Employee

Half dollar size hail was reported on Route 28 at the exit for the Air and Space Museum.

Hail in FAUQUIER, VIRGINIA
From 14-MAY-10 16:50:00 to 14-MAY-10 16:50:00 (EST-5)
Location: BROAD RUN
Magnitude: 1.00 
Reported by: Trained Spotter

Hail was estimated to be the size of quarters about one mile west-southwest of Broad Run.

Hail in FAIRFAX, VIRGINIA
From 14-MAY-10 17:15:00 to 14-MAY-10 17:15:00 (EST-5)
Location: SUNSET HILLS
Magnitude: 1.50 
Reported by: Trained Spotter

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

Hail in ALBEMARLE, VIRGINIA
From 14-MAY-10 18:40:00 to 14-MAY-10 18:40:00 (EST-5)
Location: RED HILL
Magnitude: 1.25 
Reported by: Public

Half dollar size hail was reported about three miles north of North Garden.

Hail in FAIRFAX, VIRGINIA
From 14-MAY-10 17:19:00 to 14-MAY-10 17:19:00 (EST-5)
Location: CLARKS CROSSING
Magnitude: 1.75 
Reported by: Trained Spotter

Hail up to the size of golf balls was reported about two miles northwest of Vienna.

Hail in FAIRFAX, VIRGINIA
From 14-MAY-10 17:14:00 to 14-MAY-10 17:14:00 (EST-5)
Location: CHANTILLY
Magnitude: 1.00 
Reported by: Public

Hail up to the size of quarters was reported about two miles northeast of Chantilly.

Hail in PRINCE WILLIAM, VIRGINIA
From 14-MAY-10 17:31:00 to 14-MAY-10 17:31:00 (EST-5)
Location: WOODBRIDGE ARPT
Magnitude: 1.00 
Reported by: Public

Hail up to the size of quarters was reported near Lake Ridge.