Residents across the United States are warned of severe winter weather as a significant cold spell and snowstorm are forecast to hit various regions. The National Weather Service (NWS) has issued a winter storm warning predicting up to 20 inches of snow in some areas by Monday night, with snowfall continuing into Wednesday. The storm is expected to cause hazardous travel conditions, including slippery roads and reduced visibility, especially in blizzard-prone areas with high winds. Alaska's Klondike Highway and interior Kenai Peninsula could see up to 10 inches of snow, with wind gusts reaching 50-60 mph. Meanwhile, parts of Colorado and Wyoming are forecasted to receive between 4 and 12 inches of snow, with higher elevations experiencing even more. California's Sierra Nevada and surrounding mountain ranges could see up to 2 feet of snow at higher altitudes, along with strong winds, complicating travel on major routes. The Midwest, including Ohio and Indiana, experienced early snowfall transforming landscapes and creating obstacles for commuters, while lake-effect snow blanketed parts of Wisconsin and Illinois. The storm system is expected to move northward, with a second wave of winter weather anticipated midweek. Authorities advise caution for outdoor activities and boating, particularly in snow- and wind-affected regions, as the US endures an exceptional early winter cold spell with frigid temperatures and heavy snowfall.