The National Weather Service in Sterling Virginia has issued a * Severe Thunderstorm Warning for... Eastern Washington County in north central Maryland... West central Carroll County in north central Maryland... Northwestern Frederick County in north central Maryland... Northeastern Jefferson County in the Panhandle of West Virginia... Eastern Berkeley County in the Panhandle of West Virginia... * Until 345 PM EDT. * At 225 PM EDT, a severe thunderstorm was located over Shepherdstown, moving northeast 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... Thurmont, Emmitsburg, Shepherdstown, Robinwood, Boonsboro, Smithsburg, Mount Aetna, Mount Lena, San Mar, Wolfsville, Saint James, Myersville, Cavetown, Keedysville, Sharpsburg, Fairplay, Sabillasville, Fort Ritchie, Chewsville and Rohrersville. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Prepare immediately for large hail and deadly cloud to ground lightning. Seek shelter inside a well-built structure. Stay away from windows. By The National Weather Service, Sterling, Va.