...WINTER STORM WARNING IN EFFECT FROM 7 AM WEDNESDAY TO 4 AM EST THURSDAY... * WHAT...Heavy snow expected. Total snow accumulations of 12 to 18 inches. * WHERE...Portions of northern and western Maryland, northwest Virginia and eastern West Virginia. * WHEN...From 7 AM Wednesday to 4 AM EST Thursday. Snow will overspread the region Wednesday morning, become heavy at times during the afternoon and evening, taper off late Wednesday night. * IMPACTS...Travel will be very difficult to impossible. Potential impacts include significant travel delays and closures. Plan ahead to minimize impact on you and your family. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. When venturing outside, watch your first few steps taken on steps, sidewalks, and driveways, which could be icy and slippery, increasing your risk of a fall and injury. By the National Weather Service