The National Weather Service in Sterling Virginia has issued a * Severe Thunderstorm Warning for... Western Carroll County in north central Maryland... Northeastern Frederick County in north central Maryland... * Until 715 PM EDT. * At 624 PM EDT, a severe thunderstorm was located over Thurmont, moving east at 30 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. This storm produced a 59 mph wind gust in Smithsburg. 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... Westminster, Thurmont, Emmitsburg, Taneytown, New Windsor, Woodsboro, Union Bridge, Libertytown, Sabillasville, Winfield, New Midway, Ladiesburg, Rocky Ridge, Linwood, Detour, Uniontown, Wagners Mill, Keysville, Marston and Keymar. PRECAUTIONARY/PREPAREDNESS ACTIONS... Prepare immediately for large hail and damaging winds. People outside should move immediately to shelter inside a strong building. Stay away from windows. Continuous cloud to ground lightning is occurring with this storm. Lightning is one of nature`s leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning. By The National Weather Service