Montgomery County tornado was on ground 17 miles Thursday, NWS finds

The tornado that touched down in Montgomery County Thursday carved a 17-mile path from North Potomac through Rockville and Aspen Hill and then into Burtonsville the National Weather Service (NWS) discovered in its storm survey, which it completed today.

The twister, with peak winds of 75 mph, was rated an EF-0, the lowest intensity on the 0-5 Enhanced Fujita Scale.  Its maximum width was 150 yards and it was on the ground for 18 minutes, between 3:41 p.m. and 3:59 p.m.

Fortunately, the tornado caused no injuries as it sped across Montgomery County at a nearly 60 mph clip.  But it caused plenty of tree damage.

“Damage was almost entirely from downed trees,” the NWS survey reports. “In that regard, numerous homes and a few parked vehicles were damaged by trees falling into them.”

A second tornado that touched down in St. Mary’s County was also confirmed during the NWS survey.

“Location was 3 miles NE of Redgate, Maryland,” the NWS writes on its Facebook page. “It was an EF-0 tornado with Maximum Wind Speed of 70 mph. The Path Length of the tornado was 1.5 miles long.”

The NWS is still investigating whether a third tornado occurred in Spotsylvania County in Virginia.

Below find the Montgomery County tornado survey, in its entirety from the NWS…

…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 OCCASSIONAL 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.

Jason is currently the Washington Post’s weather editor. A native Washingtonian, Jason has been a weather enthusiast since age 10.
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