District of Columbia Severe Watches & Warnings NOAA Weather Radio

Watches & Warnings

Coastal Flood Advisory
Issued: 3:59 PM EDT Apr. 20, 2019 – National Weather Service

... Coastal flood advisory in effect until 1 am EDT Sunday...

The National Weather Service in Baltimore MD/Washington has
issued a coastal flood advisory, which is in effect until 1 am
EDT Sunday.

* Locations... shoreline in the District of Columbia and
Arlington County and the city of Alexandria.

* Tidal departure... 1.5 to 2 feet above normal.

* Timing... around the time of high tide. High tide at Washington
Channel is at 9:58 PM this evening and high tide at Alexandria
is at 10:16 PM this evening.

* Impacts... shoreline inundation is expected along portions of
the seawall adjacent to Ohio drive and the Hains Point loop Road
and near the Tidal Basin. Water is expected to approach the
curb near the intersection of King Street and strand street in
Alexandria. Minor shoreline inundation up to one foot above
ground is possible elsewhere.

Precautionary/preparedness actions...

A coastal flood advisory indicates that onshore winds and tides
will combine to generate flooding of low areas along the shore.





Public Information Statement
Issued: 4:30 PM EDT Apr. 20, 2019 – National Weather Service

... NWS damage survey for the 04/19/2019 Reston Virginia
tornado event...

Start location... Reston in Fairfax County Virginia
end location... Reston in Fairfax County Virginia
date... Apr 19 2019
estimated time... 855 PM EDT
maximum ef-scale rating... EF0
estimated maximum wind speed... 70 mph
maximum path width... 100 yards
path length... 4 miles
beginning lat/Lon... 38.9302/-77.3783
ending lat/Lon... 38.9861/-77.3515
* fatalities... 0
* injuries... 0

... Summary...
a storm survey was conducted by staff of the National Weather Service
Baltimore/Washington weather forecast office in Sterling,
Virginia, of damage resulting from a storm that occurred around
900 PM EDT on Friday April 19, 2019, in Reston, Virginia.

A preliminary survey was conducted late Friday evening, with a
more comprehensive follow-up survey conducted Saturday morning,
April 20, 2019. The survey team confirmed a tornado occurred
that produced a discontinuous line of damage along a path
approximately four miles long, lasting five minutes. The tornado
was rated EF0, with peak winds of 70 miles per hour and maximum
path width of 100 yards. The tornado's storm motion was
north-northeast at approximately 50 mph. Damage was mainly due to
trees being either uprooted or topped. No injuries were reported
with this tornado.

First evidence of damage was near Fox Mill Road and Pinecrest Road
where several trees were downed at approximately 855 PM EDT. Isolated
tree damage from this point to near the U.S. Geological survey
complex on Sunrise Valley drive was noted, with several trees topped
along Glade drive near rosedown drive. After passing across the
Dulles toll Road (route 267), minor tree damage was noted between
Sunset Hills Road and baron Cameron Avenue. The tornado tracked across
Reston hospital center, with no visible signs of damage, but damage
was noted just north of the hospital on town center drive near town
center parkway, where a tree was topped, fencing blown down, and
shingles blown off several townhouses.

After crossing baron Cameron Avenue, the tornado passed just east
of trader joe's grocery store destroying an outdoor shed there.
Nearby, a tall, two-foot diameter tree crashed through the upper
floor of a townhouse on quietree drive in Reston, that led local
officials to condemn the property. Several large trees were either
uprooted or topped along Bennington Woods Road between crosswind
drive and Reston parkway. A large, 100-foot tall tree fell and
smashed the front end of an unoccupied vehicle parked along Center
Harbor Road, midway between Reston parkway and North Village
Road. Minor tree damage along a narrow path was noted in
neighborhoods located between North Village Road and Reston
parkway between Center Harbor Road and Wiehle Avenue. No
substantial storm damage was noted north of Wiehle Avenue, where
it appears the tornado weakened at 900 PM EDT.

The survey team also surveyed more storm damage extending to the
east of the tornado track primarily just east and paralleling
Reston Avenue. This damage consisted of trees blown down or topped.
The team concluded that strong straight line winds produced damage
here, with two large trees falling on Fort Lee street, one of
which fell on a house.

The National Weather Service thanks Fairfax County office of
emergency management, and both Fairfax County police and fire and
Rescue, who assisted in providing information used in conducting
the survey.

Ef scale: the Enhanced Fujita scale classifies tornadoes into the
following categories:

EF0... weak... ... 65 to 85 mph
EF1... weak... ... 86 to 110 mph
EF2... strong... .111 to 135 mph
EF3... strong... .136 to 165 mph
EF4... violent... 166 to 200 mph
EF5... violent... >200 mph

The information in this statement is preliminary and subject to
change pending final review of the event and publication in NWS
storm data.















Coastal Flood Advisory
Issued: 3:59 PM EDT Apr. 20, 2019 – National Weather Service

... Coastal flood advisory in effect until 1 am EDT Sunday...

The National Weather Service in Baltimore MD/Washington has
issued a coastal flood advisory, which is in effect until 1 am
EDT Sunday.

* Locations... shoreline in the District of Columbia and
Arlington County and the city of Alexandria.

* Tidal departure... 1.5 to 2 feet above normal.

* Timing... around the time of high tide. High tide at Washington
Channel is at 9:58 PM this evening and high tide at Alexandria
is at 10:16 PM this evening.

* Impacts... shoreline inundation is expected along portions of
the seawall adjacent to Ohio drive and the Hains Point loop Road
and near the Tidal Basin. Water is expected to approach the
curb near the intersection of King Street and strand street in
Alexandria. Minor shoreline inundation up to one foot above
ground is possible elsewhere.

Precautionary/preparedness actions...

A coastal flood advisory indicates that onshore winds and tides
will combine to generate flooding of low areas along the shore.





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