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... West central Baltimore County in northern Maryland... * Until 600 PM EDT. * At 513 PM EDT, severe thunderstorms were located over southeastern Frederick and northwestern Montgomery counties, moving east at 40 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... Frederick, Damascus, Harry Grove Stadium, Ellicott City, Randallstown, Eldersburg, Ballenger Creek, Mount Airy, Sykesville, Oakland, New Market, Gamber, Green Valley, Linganore-Bartonsville, Clarksburg, Buckeystown, Monrovia, Finksburg, Henryton and West Friendship. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. By Kevin McManus