* WHAT...Heavy snow, mixing with or possibly changing to sleet Sunday afternoon and evening, especially south of the Turnpike. Total snow and sleet accumulations between 9 and 13 inches, possibly topped by light glazing of ice. * WHERE...A portion of central Pennsylvania. * WHEN...From 10 PM this evening to 1 PM EST Monday. * IMPACTS...Travel could be very difficult to impossible. Widespread and prolonged travel disruptions are expected. * ADDITIONAL DETAILS...Snow will overspread the area Saturday night, becoming heavy at times through Sunday with accumulation rates of one to two inches per hour at times. Snow may mix with or even change to sleet near and south of the Pennsylvania Turnpike Sunday afternoon and evening, which may cut down on total snow accumulations. Frigid temperatures and wind chills are expected before, during, and after the winter storm. Some blowing and drifting snow is possible.