Coldest Air of Winter Arrives This Week Across the Eastern U.S.

A strong blast of arctic air from Canada is expected to hit the eastern United States this week, beginning a week of extreme temperatures across the region that will hit to 100 million Americans with the coldest air of the winter season.

Arctic winds, often referred to as the polar vortex, occur when rotating air from Earth's polar regions becomes unstable and moves into midlatitude areas. It is from here that these extreme temperatures escape the parameters of the polar areas and make their way to North America...