* WHAT...Heavy mixed precipitation. Additional snow and sleet accumulation between 1 and 3 inches. Storm total snow and sleet accumulations between 9 and 12 inches, * WHERE...A portion of central Pennsylvania. * WHEN...Until 1 PM EST Monday. * IMPACTS...Travel could be very difficult to impossible. Widespread and prolonged travel disruptions are expected. * ADDITIONAL DETAILS...A mixture of moderate to heavy sleet and snow will occur into early this evening, before changing back to periods of lighter snow later this evening. Frigid temperatures and wind chills are expected during and after the winter storm. Some blowing and drifting snow is possible, mainly after daybreak Monday.