..WINTER STORM WARNING IN EFFECT FROM 1 PM SATURDAY TO 1 PM EST SUNDAY... * WHAT...Heavy mixed precipitation expected. Total snow and sleet accumulations of 6 to 10 inches, with localized amounts up to 12 inches, and ice accumulations of up to two tenths of an inch are expected. * WHERE...South central Pennsylvania. * WHEN...From 1 PM Saturday to 1 PM EST Sunday. Heavy snow will move into the area Saturday afternoon and last into the late evening. A change to sleet and freezing rain will occur during the night. The heaviest of the snow will be from early afternoon through late evening. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Be prepared for significant reductions in visibility at times. Precipitation will taper off around sunrise Sunday, but the wind will become stronger and cold air will drop the wind chills and produce blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS...