* WHAT...Heavy snow expected. Total snow accumulations of 16 to 22 inches. Winds gusting as high as 35 mph. * WHERE...Portions of central, northern and northwest New Jersey and southeast Pennsylvania. * WHEN...From 5 PM this afternoon to 1 PM EST Tuesday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. * ADDITIONAL DETAILS...Snow develops late this afternoon and will last through Monday night or early Tuesday. Snow may be heavy at times on Monday. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.