From the ABC 7 Weather team

Long track tornado confirmed in Montgomery County

June 17, 2013 - 09:52 AM
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A tornado was on the ground for 17.3 miles through Montgomery County during last Thursday's big storm.

The statement below was issued on Friday from the National Weather Service office in Sterling, VA. Additional surveys may be released at some point today discussing the Saint Mary's County tornado as well as the survey of the damage in the Thornburg, VA area.

...Public Information Statement...
Long track tornado confirmed through Montgomery County, Maryland.

One additional tornado confirmed in Saint Mary’s County, Maryland
One investigation continues in Spotsylvania County

One long track tornado has been confirmed through Montgomery County. A second tornado was confirmed in Saint Mary’s County affecting the Coltons Point area. A third area of wind damage is still under investigation near Thornburg, Virginia.

The Montgomery County tornado report follows. The Saint Mary’s tornado
report will be available on Monday as the survey team is still working on the details. The Thornburg event will also be detailed on Monday.

The National Weather Service in Sterling expresses its appreciation
to those who assisted in conducting surveys and provided information
used during the surveys...including members of the emergency management...skywarn storm spotters...and members of the public affected by these storms.


...Tornado confirmed in Montgomery County, Maryland...

Location...North Potomac to Burtonsville in Montgomery County, Maryland
Date...June 13 2013
Estimated time...3:41 pm EDT to 3:59 pm EDT
Maximum EF-scale rating...EF-0
Estimated maximum wind speed...75 mph
Maximum path width...150 yards
Path length...17.3 miles
Beginning lat/lon...39.091N / 77.269W
Ending lat/lon...39.108N / 76.947W
* 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...

Eyewitness accounts...radar imagery...and a ground survey concluded
a long track EF-0 tornado occurred in Montgomery County, Maryland
on the afternoon of June 13th 2013. Peak winds were estimated at
75 mph. Damage was almost entirely from downed trees. In that
regard numerous homes and a few parked vehicles were damaged by
trees falling onto them. No injuries have been reported.

First consistent damage was noted near the intersection of Turkey Foot Road and Jones Lane in southwest Montgomery County near North Potomac, Maryland where a few large trees were over the road. The tornado raced east nearly 60 mph to the northern section of Rockville,
Maryland. At least 14 homes were significantly damaged by uprooted
trees.

As it continued east to the Norbeck and Aspen Hill area 30 trees were uprooted in the Manor Country Club Golf Course as well as numerous homes damaged in the surrounding communities from tree damage. Tree damage was noted along the Intercounty Connector Route 200 at the Layhill Road exit. Finally a few trees were downed in Spencerville and Burtonsville.

Based on the damage, this tornado is rated EF-0, with estimated wind speeds of 75 mph. The 17.3 mile damage path length was covered in 18 minutes and had consistent small branch damage with occasional areas with significant tree damage.

Additionally there was a parallel 7 miles path of damage through south
Rockville and Glenmont, Maryland with similar tree damage. This area was found to be straight line winds from the outflow just south of the tornado from the parent supercell storm.

The National Weather Service would like to extend its thanks to Montgomery County Fire who confirmed the tornado on the ground during the storm and Montgomery County Emergency Management who provided invaluable assistance during the ground survey.

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