Cutoff low pressure was over the Ohio Valley. Another area of low pressure strengthened overhead on the occluded boundary. Warm and moist air from the south lead to an unstable atmosphere. Strong shear profiles were in place due to the cutoff low to the west. Strong lift associated with the developing low combined with strong shear and enough instability to produce severe thunderstorms and isolated tornadoes.

Thunderstorm Wind in LOUDOUN, VIRGINIA
From 06-APR-17 12:21:00 to 06-APR-17 12:21:00 (EST-5)
Location: ARCOLA GLASCOCK ARPT
Magnitude: 52.00 EG
Reported by: Trained Spotter

Trees were down just north of the Intersection of Bull Run Post Office Road and U.S. 29 Lee Highway.

Thunderstorm Wind in FAIRFAX, VIRGINIA
From 06-APR-17 12:37:00 to 06-APR-17 12:37:00 (EST-5)
Location: HERNDON HGTS
Magnitude: 52.00 EG
Reported by: Public

Several small trees were snapped at the Sugarland Run Stream Valley Park in Herndon.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 12:00:00 to 06-APR-17 12:00:00 (EST-5)
Location: WARRENTON ARPT
Magnitude: 52.00 EG
Reported by: Public

An outbuilding was destroyed. A large tree and branches were also down through the exterior wall of a house on Donnybrook Drive.

Thunderstorm Wind in PRINCE WILLIAM, VIRGINIA
From 06-APR-17 12:15:00 to 06-APR-17 12:15:00 (EST-5)
Location: HOADLY
Magnitude: 52.00 EG
Reported by: Broadcast Media

A large pine tree was snapped at the base.

Thunderstorm Wind in CULPEPER, VIRGINIA
From 06-APR-17 11:43:00 to 06-APR-17 11:43:00 (EST-5)
Location: STEVENSBURG
Magnitude: 52.00 EG
Reported by: 911 Call Center

Trees were down in Stevensburg.

Thunderstorm Wind in CULPEPER, VIRGINIA
From 06-APR-17 11:45:00 to 06-APR-17 11:45:00 (EST-5)
Location: RICHARDSVILLE
Magnitude: 52.00 EG
Reported by: 911 Call Center

Trees were down on power lines in Richardsville.

Thunderstorm Wind in CULPEPER, VIRGINIA
From 06-APR-17 11:45:00 to 06-APR-17 11:45:00 (EST-5)
Location: ALANTHUS
Magnitude: 52.00 EG
Reported by: NWS Employee

Trees were down and a roof was damaged to a house near the intersection of Alanthus Road and Farley Road.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:50:00 to 06-APR-17 11:50:00 (EST-5)
Location: REMINGTON
Magnitude: 52.00 EG
Reported by: 911 Call Center

Trees were down in Remington.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:50:00 to 06-APR-17 11:50:00 (EST-5)
Location: MIDLAND WARRENTON AR
Magnitude: 52.00 EG
Reported by: 911 Call Center

Numerous trees and power lines were down along Summerduck Road near Maryann Lane.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:51:00 to 06-APR-17 11:51:00 (EST-5)
Location: GOLDVEIN
Magnitude: 52.00 EG
Reported by: Emergency Manager

Trees were down in the Block of Sumerduck Road.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:51:00 to 06-APR-17 11:51:00 (EST-5)
Location: REMINGTON
Magnitude: 52.00 EG
Reported by: Emergency Manager

Part of a roof was torn off on East Main Street.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:52:00 to 06-APR-17 11:52:00 (EST-5)
Location: GOLDVEIN
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

Several trees were downed and snapped near Sillamon road and Clovers Oak Lane.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:52:00 to 06-APR-17 11:52:00 (EST-5)
Location: OAK SHADE
Magnitude: 52.00 EG
Reported by: Public

Seven large Oaks were down on property.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:53:00 to 06-APR-17 11:53:00 (EST-5)
Location: OAK SHADE
Magnitude: 52.00 EG
Reported by: Emergency Manager

Trees were down and a barn was collapsed in the 11000 Block of Cemetery Road.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:56:00 to 06-APR-17 11:56:00 (EST-5)
Location: SOMERVILLE HARTWOOD
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A metal roof was damaged and several trees were down or snapped.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:54:00 to 06-APR-17 11:54:00 (EST-5)
Location: MORRISVILLE
Magnitude: 52.00 EG
Reported by: Emergency Manager

Trees were down near Morrisville.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:54:00 to 06-APR-17 11:54:00 (EST-5)
Location: MORRISVILLE
Magnitude: 52.00 EG
Reported by: Emergency Manager

Trees were down near the intersection of Goldmine Road and Blackwood Forest Drive.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:54:00 to 06-APR-17 11:54:00 (EST-5)
Location: OPAL
Magnitude: 52.00 EG
Reported by: Emergency Manager

Trees were down.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:56:00 to 06-APR-17 11:56:00 (EST-5)
Location: OPAL
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

Several trees were down in Opal.

Thunderstorm Wind in FAIRFAX, VIRGINIA
From 06-APR-17 12:24:00 to 06-APR-17 12:24:00 (EST-5)
Location: FAIRFAX STATION
Magnitude: 52.00 EG
Reported by: Trained Spotter

A large tree was down blocking part of Southbound Fairfax County Parkway near the intersection of Burke Center Parkway.

Thunderstorm Wind in FAIRFAX, VIRGINIA
From 06-APR-17 12:30:00 to 06-APR-17 12:30:00 (EST-5)
Location: ILDA
Magnitude: 52.00 EG
Reported by: Emergency Manager

A tree fell onto a house.

Thunderstorm Wind in PRINCE WILLIAM, VIRGINIA
From 06-APR-17 12:14:00 to 06-APR-17 12:14:00 (EST-5)
Location: WELLINGTON
Magnitude: 52.00 EG
Reported by: Emergency Manager

Trees were down on Sudley Manor Road.

Thunderstorm Wind in FAIRFAX, VIRGINIA
From 06-APR-17 12:27:00 to 06-APR-17 12:27:00 (EST-5)
Location: FLORIS
Magnitude: 52.00 EG
Reported by: NWS Employee

A tree was uprooted.

Thunderstorm Wind in ARLINGTON, VIRGINIA
From 06-APR-17 12:38:00 to 06-APR-17 12:38:00 (EST-5)
Location: ARLINGTON
Magnitude: 52.00 EG
Reported by: Broadcast Media

Several tree and power poles were snapped.

Thunderstorm Wind in KING GEORGE, VIRGINIA
From 06-APR-17 12:10:00 to 06-APR-17 12:10:00 (EST-5)
Location: KING GEORGE
Magnitude: 52.00 EG
Reported by: State Official

Trees were down in King George along Route 301. One tree fell into a house.

Thunderstorm Wind in FAIRFAX, VIRGINIA
From 06-APR-17 12:29:00 to 06-APR-17 12:29:00 (EST-5)
Location: ANNANDALE
Magnitude: 52.00 EG
Reported by: Broadcast Media

A large tree fell onto a house splitting it in half.

Thunderstorm Wind in PRINCE WILLIAM, VIRGINIA
From 06-APR-17 12:19:00 to 06-APR-17 12:19:00 (EST-5)
Location: WOODBRIDGE ARPT
Magnitude: 52.00 EG
Reported by: State Official

A tree fell onto a house and deck.

Thunderstorm Wind in PRINCE WILLIAM, VIRGINIA
From 06-APR-17 12:18:00 to 06-APR-17 12:18:00 (EST-5)
Location: OCCOQUAN
Magnitude: 52.00 EG
Reported by: State Official

A tree fell onto a house.

Thunderstorm Wind in PRINCE WILLIAM, VIRGINIA
From 06-APR-17 12:18:00 to 06-APR-17 12:18:00 (EST-5)
Location: WEST GATE OF LOMOND
Magnitude: 52.00 EG
Reported by: 911 Call Center

A tree fell onto power lines blocking Lomond Drive near Powhatan Street.

Thunderstorm Wind in PRINCE WILLIAM, VIRGINIA
From 06-APR-17 12:14:00 to 06-APR-17 12:14:00 (EST-5)
Location: HOADLY
Magnitude: 52.00 EG
Reported by: 911 Call Center

A tree fell onto power lines on Old Delaney Road.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:58:00 to 06-APR-17 11:58:00 (EST-5)
Location: SOMERVILLE
Magnitude: 52.00 EG
Reported by: Emergency Manager

Trees were down in the 2000 Block of Aquia road.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 11:59:00 to 06-APR-17 11:59:00 (EST-5)
Location: CROMWELL
Magnitude: 52.00 EG
Reported by: Emergency Manager

A Greenhouse was destroyed in the 7000 Block of Tacketts Mill Road.

Thunderstorm Wind in LOUDOUN, VIRGINIA
From 06-APR-17 12:29:00 to 06-APR-17 12:29:00 (EST-5)
Location: ARCOLA GLASCOCK ARPT
Magnitude: 52.00 EG
Reported by: Public

About two dozen trees were snapped near the intersection of Gum Spring road and Lennox Hale Drive.

Thunderstorm Wind in FAIRFAX, VIRGINIA
From 06-APR-17 12:31:00 to 06-APR-17 12:31:00 (EST-5)
Location: NORTH SPRINGFIELD
Magnitude: 52.00 EG
Reported by: Trained Spotter

Several trees were down on Philip road.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 12:02:00 to 06-APR-17 12:02:00 (EST-5)
Location: DUDIE
Magnitude: 52.00 EG
Reported by: Public

Numerous trees were down along Waterloo Farm Road.

Thunderstorm Wind in ORANGE, VIRGINIA
From 06-APR-17 11:27:00 to 06-APR-17 11:27:00 (EST-5)
Location: ORANGE CO ARPT
Magnitude: 53.00 MG
Reported by: AWOS

A wind gust of 61 mph was reported.

Thunderstorm Wind in FAUQUIER, VIRGINIA
From 06-APR-17 12:09:00 to 06-APR-17 12:09:00 (EST-5)
Location: AUBURN
Magnitude: 52.00 EG
Reported by: Trained Spotter

Dozens of trees were down near Greenwich.

Thunderstorm Wind in FAIRFAX, VIRGINIA
From 06-APR-17 12:35:00 to 06-APR-17 12:35:00 (EST-5)
Location: HERNDON
Magnitude: 52.00 EG
Reported by: Trained Spotter

A tree was down at the Courtyard Hotel in Herndon.

Thunderstorm Wind in MANASSAS (C), VIRGINIA
From 06-APR-17 12:21:00 to 06-APR-17 12:21:00 (EST-5)
Location: MANASSAS
Magnitude: 51.00 MG
Reported by: Mesonet

A wind gust of 59 mph was reported.

Thunderstorm Wind in PRINCE WILLIAM, VIRGINIA
From 06-APR-17 12:15:00 to 06-APR-17 12:15:00 (EST-5)
Location: INDEPENDENT HILL
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 59 mph was reported at Independent hill.

Thunderstorm Wind in LOUDOUN, VIRGINIA
From 06-APR-17 12:27:00 to 06-APR-17 12:27:00 (EST-5)
Location: ARCOLA GLASCOCK ARPT
Magnitude: 52.00 EG
Reported by: NWS Employee

A tree fell onto a car.

Thunderstorm Wind in PRINCE WILLIAM, VIRGINIA
From 06-APR-17 12:11:00 to 06-APR-17 12:11:00 (EST-5)
Location: CANOVA
Magnitude: 52.00 EG
Reported by: 911 Call Center

A tree was down on a power line.

Thunderstorm Wind in PRINCE WILLIAM, VIRGINIA
From 06-APR-17 12:13:00 to 06-APR-17 12:13:00 (EST-5)
Location: MINNIEVILLE
Magnitude: 52.00 EG
Reported by: 911 Call Center

A tree fell onto power lines.

Thunderstorm Wind in PRINCE WILLIAM, VIRGINIA
From 06-APR-17 12:12:00 to 06-APR-17 12:12:00 (EST-5)
Location: NOKESVILLE
Magnitude: 52.00 EG
Reported by: 911 Call Center

Trees were down near Bristow.

Thunderstorm Wind in PRINCE WILLIAM, VIRGINIA
From 06-APR-17 12:15:00 to 06-APR-17 12:15:00 (EST-5)
Location: WOODBRIDGE
Magnitude: 52.00 EG
Reported by: 911 Call Center

A tree fell onto power lines.

Tornado in FAUQUIER, VIRGINIA
From 06-APR-17 11:58:00 to 06-APR-17 11:59:00 (EST-5)
Location: TURNBULL
Tornado F-scale: EF0
Reported by: NWS Storm Survey

The National Weather Service in Baltimore MD/Washington DC has
confirmed a tornado southwest of Warrenton in Fauquier County
Virginia on April 6, 2017.
An extensive area of tree damage was noted along a several mile long
path in west-central Fauquier County. Embedded within this straight-
line wind damage was a small concentrated area of convergent tree
damage consistent with an EF-0 tornado.
A row of trees just north of Harts Mill Road was blown down towards
the west-northwest, while several other trees just south of the road
were snapped and fell towards the northeast. A similar pattern of tree
damage was found at a residence on Woodbourne Lane a quarter mile to
the northeast, where several dozen hardwood trees were uprooted, mainly
falling towards the east but a couple fell towards the west.
Further southwest and to the northeast of the tornadic damage,
hardwood and softwood trees were snapped and uprooted but all falling
to the northeast over a nearly mile-wide swath, indicating straight-line
wind damage. It is notable that the straight-line wind damage was more
severe than that caused by the brief tornado.
The National Weather Service would like to thank the Fauquier County
Emergency Management Agency and the residents interviewed for their
assistance in this survey.

Tornado in ORANGE, VIRGINIA
From 06-APR-17 11:29:00 to 06-APR-17 11:33:00 (EST-5)
Location: UNIONVILLE
Tornado F-scale: EF0
Reported by: NWS Storm Survey

The National Weather Service in Baltimore MD/Washington DC has
confirmed a tornado near Unionville in Orange County Virginia
on April 6, 2017.
The tornado caused extensive convergent tree damage intermittently
along its path, along with some minor structural damage. The first
instances of uprooted and snapped trees occurred near the
intersection of Everona Road and Deertrail Lane. The tornado
continued north-northeast, causing additional tree damage on
Signal Hill Lane.
The most extensive impacts occurred along US Route 522 near Ida Mae
Lane, where many of the trees in the concentrated path of the
tornado were either snapped or uprooted in differing directions. At
least two trees fell on structures. Metal roofing and siding were
removed from a business on the sides of the building opposing storm
motion. Some of this material was lofted and landed in a yard 0.4
miles away. The wall of an outbuilding was displaced several
inches off its foundation. Several homes received minor damage to
shingles, gutters, and siding. Two residents in this area witnessed
the tornado and observed debris being lofted and swirling in the
air. The survey concluded that this concentrated tornadic damage was
embedded within a larger area of very strong straight-line winds, as
numerous trees were downed in unidirectional fashion along a 0.7 mile
stretch of US 522.
The next observable damage occurred on Pine Stake Road near Clover
Hill Farm Lane. Trees were downed in a convergent pattern along a
narrow path, and a wooden fence sustained damage. The tornado lifted
after this point, as no further damage was observed to the north-
northeast.
The National Weather Service would like to thank the Orange County
Emergency Management Agency and the residents interviewed for their
assistance in this survey.

Thunderstorm Wind in ORANGE, VIRGINIA
From 06-APR-17 11:33:00 to 06-APR-17 11:33:00 (EST-5)
Location: THORNHILL
Magnitude: 52.00 EG
Reported by: Trained Spotter

Multiple trees more than one foot in diameter were down. Structural damage was reported from wind and a barn was also blown down.

Thunderstorm Wind in CULPEPER, VIRGINIA
From 06-APR-17 11:35:00 to 06-APR-17 11:35:00 (EST-5)
Location: WINSTON
Magnitude: 52.00 EG
Reported by: NWS Employee

Numerous trees were down and a small shed was destroyed.

Thunderstorm Wind in ORANGE, VIRGINIA
From 06-APR-17 11:36:00 to 06-APR-17 11:36:00 (EST-5)
Location: LOCUSTGROVE
Magnitude: 52.00 EG
Reported by: Public

Numerous trees were snapped and uprooted in the 31000 Block of Deep Meadow Lane.

Tornado in FAUQUIER, VIRGINIA
From 06-APR-17 12:08:00 to 06-APR-17 12:14:00 (EST-5)
Location: BETHEL
Tornado F-scale: EF0
Reported by: NWS Storm Survey

The National Weather Service in Baltimore MD/Washington DC has
confirmed a tornado near Airlie in Fauquier County Virginia on April
6, 2017.
The tornado caused a nearly continuous path of convergent tree damage.
Large to mid sized trees were snapped and uprooted. The most intense
of which was the result of estimated wind speeds of 85 mph that
snapped several large trees on Airlie Road between Artillery Road
and The Rainforest Trust. The first trees downed were noted just
west of US 17. After crossing Airlie Road, the tornado snapped and
uprooted trees all along Blantyre Road. Continuous damage stopped
just prior to Interstate 66.
The National Weather Service would like to thank the Fauquier County
Emergency Management Agency and the residents interviewed for their
assistance in this survey.

Tornado in FAUQUIER, VIRGINIA
From 06-APR-17 12:08:00 to 06-APR-17 12:10:00 (EST-5)
Location: NEW BALTIMORE
Tornado F-scale: EF0
Reported by: NWS Storm Survey

The National Weather Service in Baltimore MD/Washington DC has
confirmed a tornado near New Baltimore in Fauquier County
Virginia on April 6, 2017.
The tornado caused a continuous path of extensive tree damage,
along with some minor structural damage. The first instances
of uprooted and snapped trees occurred just northwest of the
intersection of Lee Highway and Electric Avenue. The tornado
continued north-northeast, generally along Beverlys Mill Road,
causing additional damage to just north of Fairview Lane.
Extensive tree damage was found along the tornados path,
where many hardwood and softwood trees were either snapped,
topped or uprooted in a convergent pattern. Several trees
fell on vehicles. Wooded fences were blown down in several
locations along its path. A roof was partially removed from
a barn. Other metal roofing was removed from smaller outbuildings.
Several sheds were either destroyed or severely damaged. Most homes
in the path had minor damage to shingles, gutters and siding.
Two residents in the area witnessed the tornado with debris
being lofted.
The National Weather Service would like to thank Fauquier
County Emergency Management Agency and the residents interviewed
for their assistance in this survey.

Tornado in LOUDOUN, VIRGINIA
From 06-APR-17 12:37:00 to 06-APR-17 12:38:00 (EST-5)
Location: STERLING
Tornado F-scale: EF0
Reported by: NWS Storm Survey

Additional minor and sporadic tree damage was noted in a
north-northeastward path, with several trees snapped and
uprooted and an instance of siding damage noted by a trained
spotter just east of South Lincoln Avenue. The tornado likely
lifted for a final time just northeast of the intersection of
East Frederick Drive and Sugarland Road in Sterling Park.
The National Weather Service would like to thank Fairfax and Loudoun
County Emergency Management Agency and the residents interviewed
for their assistance in this survey.

Tornado in ARLINGTON, VIRGINIA
From 06-APR-17 12:39:00 to 06-APR-17 12:42:00 (EST-5)
Location: SOUTH WASHINGTON
Tornado F-scale: EF0
Reported by: NWS Storm Survey

Trees were snapped along Interstate 395 adjacent to Army-Navy
Country Club at approximately 1:39 PM EDT. Video of a portion of
the Pentagon Parking Lot showed a vortex cross between two light
poles, ripping off one lamp from the top of the poles. Additional
video from the Pentagon showed two rope-like funnel clouds form at
the same time, although it could not be determined from the video
whether these funnels touched the ground or were attached to the
cloud base. Video from the National Park Service National Mall and
Memorial Parks showed a waterspout over the Potomac River west of
the Tidal Basin; however, it is not clear the vertical extent of
this waterspout and whether it was sourced from the cloud base, or
an independent vortex associated with the gust front.

Tornado in FAIRFAX, VIRGINIA
From 06-APR-17 12:34:00 to 06-APR-17 12:37:00 (EST-5)
Location: HERNDON HGTS
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A path of sporadic damage, mainly to trees, began just east
of Rock Hill Road in between the Dulles Greene and Capstone
apartment complexes in Herndon. About a half dozen trees here
were either snapped or uprooted in a convergent pattern. One of
the trees was thrown into the window of a nearby apartment
building.
The National Weather Service would like to thank Fairfax and Loudoun
County Emergency Management Agency and the residents interviewed
for their assistance in this survey.
The tornado continued north-northeast, where additional tree
damage was noted near the intersections of Summerfield Drive
and Autumn Breeze Court, and Sterling Road (VA-606) and
Herndon Parkway. Several trees were downed from east to west,
and fencing was blown down north to south.
It appears the tornado lifted briefly as it continued
north-northeast, before touching down again near the intersection
of Crestview Drive and Builders Road. Here, nearly a dozen trees
were snapped or uprooted, mainly to the north, with fencing
blown down towards the trees (to the west).