A significant storm system is forecast to impact the Midwest and East Coast of the United States starting Sunday, bringing a mix of snow, freezing rain, and cold air. Blizzard warnings are in effect for Minnesota, Wisconsin, and northern Michigan, with potential for heavy snowfall and whiteout conditions. Other regions, including parts of the Northeast, may experience freezing rain and ice, leading to hazardous travel. Major cities like Chicago, Cleveland, and Buffalo could face flooding due to rain melting existing snow, while New York, Philadelphia, and Boston are expected to see mostly rain.