Public Information Statement
Issued by NWS Sterling, VA

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NOUS41 KLWX 072134
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Public Information Statement
National Weather Service Baltimore MD/Washington DC
534 PM EDT Fri Apr 7 2017

...Tornado Confirmed in Arlington VA and Washington DC...

Location...Arlington VA to Washington DC
Date...April 6 2017
Estimated Time...139 pm EDT to 145 PM EDT
Maximum EF-Scale Rating...EF-0
Estimated Maximum Wind Speed...70 MPH
Maximum Path Width...25-50 yards
Path Length...4.5 miles
Beginning Lat/Lon...38.85/77.07W
Ending lat/Lon...38.90/77.01W
* Fatalities...0
* Injuries...0

* The information in this statement is preliminary and subject to
change pending final review of the event(s) and publication in
NWS Storm Data.

...Summary...
The National Weather Service in Baltimore MD/Washington DC has
confirmed an EF-0 tornado initiating in Arlington VA and ending in
Washington DC on April 6, 2017. This tornado is in addition to the
confirmed tornado at Joint Base Anacostia-Bolling reported
yesterday.

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.

The waterspout then moved onshore near the George Mason Memorial
at the Tidal Basin at approximately 1:41 PM EDT. Here, multiple
large softwood and hardwood trees, including several ornamental
cherry trees, had large branches downed and/or were uprooted
around the Tidal Basin. While some minor tree damage was evidenced
near the George Mason Memorial on the southwest side of the Tidal
Basin, the most concentrated damage was in the grove of trees
directly adjacent to the parking lot of the Tidal Basin Marina.

The last damage reported to the NWS was to the roof of the St.
Aloysius Church at the intersection of North Capitol and I
Streets NW at 145 PM EDT.

This tornado is rated EF-0 with estimated winds 60-70 MPH, path
length of 4.5 miles, and a path width of 25-50 YARDS. The wind
estimates were based on the damage observed, weather radar
velocity observations from the KLWX WSR-88D and from Federal
Aviation Administration Terminal Doppler Weather Radars at Joint
Base Andrews and Reagan National Airport, and the fact that
several of the larger downed trees around the Tidal Basin had
evidence of ample rot in the base of their trunks.

This information can also be found on our website at
weather.gov/washington.

For reference...the Enhanced Fujita Scale classifies tornadoes
into the following categories:

EF0...wind speeds 65 to 85 mph.
EF1...wind speeds 86 to 110 mph.
EF2...wind speeds 111 to 135 mph.
EF3...wind speeds 136 to 165 mph.
EF4...wind speeds 166 to 200 mph.
EF5...wind speeds greater than 200 mph.

$$

Lee



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