226  
NOUS41 KLWX 201358  
PNSLWX  
DCZ001-MDZ003>006-011-013-014-016>018-501>508-VAZ025>031-036>040-  
050>057-501>508-WVZ050>053-055-501>506-202200-  
 
PUBLIC INFORMATION STATEMENT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
958 AM EDT TUE JUN 20 2017  
 
...TORNADO CONFIRMED IN THE FOUR CORNERS SECTION OF SILVER SPRING  
IN MONTGOMERY COUNTY MARYLAND...  
 
LOCATION...FOUR CORNERS SECTION OF SILVER SPRING MARYLAND  
DATE...JUNE 19, 2017  
ESTIMATED TIME...3:49 PM EDT  
MAXIMUM EF-SCALE RATING...EF-0  
ESTIMATED MAXIMUM WIND SPEED...70 MPH  
MAXIMUM PATH WIDTH...100 YARDS  
PATH LENGTH...0.2 MILES  
BEGINNING LAT/LON...39.0274N / 77.0176W  
ENDING LAT/LON...39.0284N / 77.0138W  
* 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 A TORNADO IN THE FOUR CORNERS SECTION OF SILVER SPRING IN  
MONTGOMERY COUNTY MARYLAND ON JUNE 19, 2017.  
 
THE NATIONAL WEATHER SERVICE CONDUCTED A GROUND SURVEY OF THE  
DAMAGED COMMUNITY. THE SURVEY WAS GREATLY ASSISTED BY MONTGOMERY  
COUNTY'S OFFICE OF EMERGENCY MANAGEMENT.  
 
AN EYEWITNESS REPORTED DAMAGING WINDS BLOWING TO THE EAST,  
FOLLOWED IMMEDIATELY BY DAMAGING WINDS BLOWING WEST. THIS ALIGNS  
WITH A SMALL, WEAK ROTATION NOTED ON FAA'S TERMINAL DOPPLER  
WEATHER RADAR LOCATED AT JOINT BASE ANDREWS. THE DAMAGE AREA WAS  
VERY COMPACT, WITH MOST OF THE DAMAGE CONFINED TO A WOODED  
COMMUNITY ALONG A TWO BLOCK STRETCH OF DENNIS AVENUE, BETWEEN  
ROYALTON ROAD AND EASTWOOD AVENUE. DAMAGE WAS ENTIRELY TO TREES  
AND OBJECTS/HOMES THAT TREES FELL ON. MOST OF THE DAMAGE WAS TO  
AND THE RESULT OF MODERATE SIZED BRANCHES OF TULIP POPLARS ABOUT 8  
TO 12 INCHES IN DIAMETER. TWO TREES WERE UPROOTED AS WELL. HOMES,  
VEHICLES, AND POWER LINES WERE DAMAGED FROM FALLING TREES AND  
BRANCHES, WITH SOME HOMES RENDERED UNINHABITABLE. NO STRUCTURAL  
DAMAGE WAS NOTED THAT WAS NOT THE RESULT OF FALLING TREES. WHILE  
MUCH OF THE TREE DAMAGE WAS FROM AN EASTERLY WIND, THERE WAS  
DAMAGE NOTED IN MULTIPLE DIRECTIONS. MOST OF THE TREE DAMAGE WAS  
TO THE HIGHER BRANCHES. NO INJURIES OR FATALITIES WERE REPORTED AS  
OF THE EVENING OF THE SURVEY. THE ENTIRE EVENT LIKELY TRANSPIRED  
IN LESS THAN A MINUTE.  
 
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.  
 

 
STRONG  
 
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