THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHWESTERN MONTGOMERY COUNTY IN CENTRAL MARYLAND... SOUTH CENTRAL FREDERICK COUNTY IN NORTH CENTRAL MARYLAND... NORTHEASTERN LOUDOUN COUNTY IN NORTHERN VIRGINIA... SOUTHEASTERN JEFFERSON COUNTY IN THE PANHANDLE OF WEST VIRGINIA... * UNTIL 530 PM EDT * AT 443 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR PURCELLVILLE... OR 8 MILES EAST OF CHARLES TOWN...MOVING EAST AT 40 MPH. HAZARD...60 MPH WIND GUSTS AND HALF DOLLAR SIZE HAIL. SOURCE...RADAR INDICATED. IMPACT...DAMAGING WINDS WILL CAUSE SOME TREES AND LARGE BRANCHES TO FALL. THIS COULD INJURE THOSE OUTDOORS...AS WELL AS DAMAGE HOMES AND VEHICLES. ROADWAYS MAY BECOME BLOCKED BY DOWNED TREES. LOCALIZED POWER OUTAGES ARE POSSIBLE. UNSECURED LIGHT OBJECTS MAY BECOME PROJECTILES. * LOCATIONS IMPACTED INCLUDE... GERMANTOWN...POOLESVILLE...PURCELLVILLE...POINT OF ROCKS...BOYDS... CLARKSBURG...DARNESTOWN...ADAMSTOWN...LOVETTSVILLE...BARNESVILLE... HILLSBORO...NEERSVILLE...DICKERSON...PAEONIAN SPRINGS... TUSCARORA...WATERFORD...BEALLSVILLE...TAYLORSTOWN... DAWSONVILLE AND LUCKETTS. PRECAUTIONARY/PREPAREDNESS ACTIONS... GET INDOORS TO PROTECT YOURSELF FROM WIND AND LIGHTNING. TREES AROUND YOU MAY BE DOWNED FROM DAMAGING WINDS...SO IF YOU ARE NEAR LARGE TREES...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR. DON`T DRIVE UNDERNEATH TREES OR IN WOODED AREAS UNTIL THE THREAT HAS PASSED.