The National Weather Service in Sterling Virginia has issued a * Severe Thunderstorm Warning for... Southeastern Carroll County in north central Maryland... Northern Howard County in central Maryland... North central Montgomery County in central Maryland... Southeastern Frederick County in north central Maryland... Southwestern Baltimore County in northern Maryland... * Until 345 PM EDT. * At 307 PM EDT, a severe thunderstorm was located over Mount Airy, or 7 miles north of Damascus, moving east at 35 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... Columbia, Damascus, Historic Ellicott City, Ellicott City, Catonsville, Woodlawn, Randallstown, Owings Mills, Eldersburg, Milford Mill, Reisterstown, Mount Airy, Sykesville, Oakland, New Market, Gamber, Green Valley, Linganore-Bartonsville, Ilchester and Garrison. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. By the National Weather Service, Sterling, Va.