* WHAT...Snow expected. Snow accumulations between 6 and 12 inches, locally up to 18 inches. Winds gusting as high as 45 mph. * WHERE...Stevens Pass, Stehekin, and Holden Village. * WHEN...Until 4 AM PST Friday. * IMPACTS...Travel could be very difficult. Strong winds could cause tree damage. * ADDITIONAL DETAILS...Snow levels will increase Thursday morning to early afternoon, which could bring a brief period of freezing rain before snow levels drop again through the evening. Confidence is low for freezing rain, but the potential exists for light accumulations.