The National Weather Service in Sterling Virginia has issued a * Severe Thunderstorm Warning for... Southeastern Carroll County in north central Maryland... Northwestern Howard County in central Maryland... Northern Montgomery County in central Maryland... Southeastern Frederick County in north central Maryland... West central Baltimore County in northern Maryland... * Until 515 PM EDT. * At 437 PM EDT, severe thunderstorms were located along a line extending from near Walkersville to near Linganore-Bartonsville to near Point Of Rocks, moving east at 55 mph. THESE ARE DESTRUCTIVE STORMS FOR SOUTHERN FREDERICK COUNTY, NORTHERN MONTGOMERY COUNTY, WESTERN HOWARD COUNTY, AND SOUTHERN CARROLL COUNTY IN CENTRAL MD. HAZARD...80 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect considerable damage to trees and power lines. Your life is at significant risk if outdoors. In addition to some trees falling into homes, wind damage is possible to roofs, sheds, open garages, and mobile homes. * Locations impacted include... Germantown, Frederick, Gaithersburg, Olney, Damascus, Harry Grove Stadium, Ellicott City, Aspen Hill, Randallstown, Montgomery Village, Owings Mills, Eldersburg, Ballenger Creek, Redland, Mount Airy, Walkersville, Sykesville, Oakland, New Market and Green Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. This is an EXTREMELY DANGEROUS SITUATION with tornado like wind speeds expected. Mobile homes and high profile vehicles are especially susceptible to winds of this magnitude and may be overturned. For your protection move to an interior room on the lowest floor of a building. These storms have the potential to cause serious injury and significant property damage. A Tornado Watch remains in effect until 900 PM EDT for northern, central and north central Maryland. By The National Weather Service, Sterling, Va.