High pressure off the Atlantic coast allowed for a southerly flow to usher in warm and humid conditions. The warm and humid conditions led to an unstable atmosphere. A pressure trough acted as a lifting mechanism for showers and thunderstorms to develop. Some thunderstorms became severe due to the instability and stronger winds aloft.

Thunderstorm Wind in FAIRFAX, VIRGINIA
From 18-MAY-17 19:05:00 to 18-MAY-17 19:05:00 (EST-5)
Location: SIDEBURN
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down near Burke Common Road and Robert Commons Lane.

Thunderstorm Wind in FAIRFAX, VIRGINIA
From 18-MAY-17 19:05:00 to 18-MAY-17 19:05:00 (EST-5)
Location: BUFFS CORNER
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down at Chapel Road and Yates ford Road.

Hail in FREDERICK, VIRGINIA
From 18-MAY-17 17:32:00 to 18-MAY-17 17:32:00 (EST-5)
Location: SOUTH VIEW
Magnitude: 1.00 
Reported by: Public

Quarter sized hail was reported along Buckhorn Road.

Hail in LOUDOUN, VIRGINIA
From 18-MAY-17 18:42:00 to 18-MAY-17 18:42:00 (EST-5)
Location: ARCOLA GLASCOCK ARPT
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter sized hail was reported.

Hail in PRINCE WILLIAM, VIRGINIA
From 18-MAY-17 18:57:00 to 18-MAY-17 18:57:00 (EST-5)
Location: HAYMARKET
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter sized hail was reported.

Thunderstorm Wind in CLARKE, VIRGINIA
From 18-MAY-17 17:46:00 to 18-MAY-17 17:46:00 (EST-5)
Location: BERRYVILLE
Magnitude: 52.00 EG
Reported by: 911 Call Center

Three trees were down.

Hail in SHENANDOAH, VIRGINIA
From 18-MAY-17 17:12:00 to 18-MAY-17 17:12:00 (EST-5)
Location: CAPON RD
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter sized hail was reported.

Thunderstorm Wind in FAIRFAX, VIRGINIA
From 18-MAY-17 18:58:00 to 18-MAY-17 18:58:00 (EST-5)
Location: BULL RUN
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down at Mount Olive and Compton Road.

Thunderstorm Wind in FAIRFAX, VIRGINIA
From 18-MAY-17 18:59:00 to 18-MAY-17 18:59:00 (EST-5)
Location: JOHNSONS CORNER
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down at Old Centerville Road and Ravenscar Court.

Thunderstorm Wind in FAIRFAX, VIRGINIA
From 18-MAY-17 19:27:00 to 18-MAY-17 19:27:00 (EST-5)
Location: NEWINGTON
Magnitude: 50.00 EG
Reported by: NWS Employee

A tree eight inches in diameter was down in the 6800 Block of Bulkley Road.

Thunderstorm Wind in PRINCE WILLIAM, VIRGINIA
From 18-MAY-17 19:30:00 to 18-MAY-17 19:30:00 (EST-5)
Location: FEATHERSTONE
Magnitude: 52.00 EG
Reported by: 911 Call Center

Trees were down.

Hail in LOUDOUN, VIRGINIA
From 18-MAY-17 18:42:00 to 18-MAY-17 18:42:00 (EST-5)
Location: ARCOLA GLASCOCK ARPT
Magnitude: 1.00 
Reported by: NWS Employee

Quarter sized hail was reported at Pamplin Terrace.

Hail in FREDERICK, VIRGINIA
From 18-MAY-17 17:30:00 to 18-MAY-17 17:30:00 (EST-5)
Location: MEADOW MILLS
Magnitude: 1.00 
Reported by: Public

Quarter sized hail was reported.

Thunderstorm Wind in PRINCE WILLIAM, VIRGINIA
From 18-MAY-17 19:24:00 to 18-MAY-17 19:24:00 (EST-5)
Location: MINNIEVILLE
Magnitude: 57.00 MG
Reported by: Mesonet

A wind gust of 66 mph was reported at Forest Park High School.

Thunderstorm Wind in FAIRFAX, VIRGINIA
From 18-MAY-17 19:05:00 to 18-MAY-17 19:05:00 (EST-5)
Location: FAIRFAX STATION
Magnitude: 50.00 EG
Reported by: 911 Call Center

A tree was down at Burke Center Parkway and Ox Road.