The National Weather Service (NWS) has issued warnings for severe winter weather across the U.S. as the New Year approaches. The Great Lakes region can expect heavy lake-effect snow, with up to 2-3 feet forecast, while the Midwest and Northeast face snow squalls. Southern California and Los Angeles are at risk of flash flooding due to heavy rain. Milder conditions are anticipated in the Intermountain West, contrasting with the widespread cold and snow elsewhere.