Harsh weather moved west on Monday as a polar vortex was expected to grip the Rockies and the northern Plains after winter storms pummeled the eastern U.S. over the weekend, killing at least 10 people,

At the Dakota Zoo in Bismarck, which closed last weekend due to cold, critters such as bison, elk and bighorn sheep don't mind the temperatures as they munch food to stay warm and

Life-threatening cold air will continue to surge across the central United States through midweek and build into the East into the end of this week before it begins to ease up, AccuWeather meteorologists say,