The National Weather Service in Pittsburgh has issued a Severe Thunderstorm Warning for... Allegheny County in southwestern Pennsylvania... Beaver County in western Pennsylvania... Butler County in west central Pennsylvania... Washington County in southwestern Pennsylvania... Westmoreland County in southwestern Pennsylvania... Until 7:15 PM Eastern Daylight Time. At 6:28 PM EDT, severe thunderstorms were located along a line extending from near Cranberry Township to Moon Township to Canonsburg, moving east at 45 miles per hour. HAZARD...70 mile per hour wind gusts and possible tornadoes. SOURCE...Radar indicated rotation within the storm line. IMPACT...Expect considerable tree damage. Damage to roofs, siding, and vehicles is likely. Tornadoes can develop quickly with these storms and may cause localized severe damage. Locations impacted include... Pittsburgh, Monroeville, Bethel Park, McCandless, Cranberry Township, Moon Township, Washington, Beaver Falls, and Greensburg. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection, move to an interior room on the lowest floor of a sturdy building. If a Tornado Warning is issued for your location, take cover immediately. Stay away from windows. A Tornado Watch remains in effect for southwestern Pennsylvania.