A winter storm will bring widespread mountain snow and difficult driving conditions this weekend and into early next week. Impacts will begin Saturday night as snow levels fall to 4,000-4,500 feet. By Monday and Tuesday, snow levels will drop further to 3,000-3,500 feet, leading to rain and snow showers in the valleys. Now is the time to prepare for winter travel; finalize your winter survival kit, especially if you plan to drive over mountain passes.