If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Monitor the latest forecasts for updates on this situation.

* WHAT...For the Winter Storm Warning above 1500 feet, heavy snow. Additional snow accumulations of up to one inch. For the Winter Storm Watch, heavy snow possible. Total snow accumulations of up to 3 feet possible over the mountains. Winds could gust as high as 40 mph. * WHERE...Cascade mountains and valleys of Whatcom and Skagit Counties, including Maple Falls, the Mount Baker Ski Area, Newhalem, Lyman, and Concrete, Cascade mountains and valleys of Snohomish and King Counties, including Darrington, Index, Skykomish, Stevens Pass, and Snoqualmie Pass and Cascade mountains and valleys of Pierce and Lewis Counties, including the Crystal Mountain Ski Area, Paradise on Mount Rainier, Ashford, Randle, and Packwood. * WHEN...For the Winter Storm Warning, until 4 AM PST early this morning. For the Winter Storm Watch, from this afternoon through Thursday evening. * IMPACTS...Travel could be very difficult.