The National Weather Service (NWS) has issued heavy snow warnings across several western U.S. states, predicting significant snow accumulations. Alaska's Upper Tanana Valley and eastern Alaska Range are expected to receive substantial snowfall, coupled with winds reaching 35 mph. Oregon's eastern slopes of the Cascades could see up to 15 inches of snow, while Washington's Cascades might experience up to 20 inches, potentially impacting transportation and causing school closures. Utah's central and southern mountains are forecasted to receive between 8 and 12 inches of snow, advising residents to prepare for slippery road conditions. California's Ventura and Santa Barbara County mountains are under advisories for wet snow and strong winds, urging motorists to exercise caution.