The National Weather Service in Sterling Virginia has issued a * Severe Thunderstorm Warning for... West central Montgomery County in central Maryland... Southern Frederick County in north central Maryland... Northeastern Loudoun County in northern Virginia... * Until 530 PM EDT. * At 454 PM EDT, severe thunderstorms were located along a line extending from near Point Of Rocks to near Leesburg to near Oatlands, moving east at 25 mph. HAZARD...60 mph wind gusts and quarter 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, Leesburg, Lansdowne, Lowes Island, Poolesville, Ashburn, Great Falls, Countryside, Boyds, Clarksburg, Darnestown, Belmont, Barnesville, Paeonian Springs, Waterford, Lucketts, Dickerson, Beallsville, Dawsonville and Tuscarora. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building.