A rare split polar Vortex will plunge millions of Americans into freezing temperatures as it's set to blast powerful cold air across the country around Valentine's Day. Forecasters have warned of snow ...

January is shaping up to be the coldest in a decade as the polar vortex dips south across the eastern half of the United States — shocking a nation that has enjoyed an unusually balmy end of the year.

In a year without much winter weather, there’s a chance of a bitter blow before spring takes hold. Experts say a disruption of the polar vortex could unleash cold, stormy conditions to the eastern ...