However, a deep freeze, thanks to the polar vortex dipping down from Siberia, is bringing an even harsher arctic blast to million Americans this week. Maps show what to expect as the cold front ...

Millions of people across the U.S. will experience subzero or below-average temperatures in the coming days as a polar vortex coming from Siberia will usher in a new cold front. The Rockies ...

When this stratospheric vortex becomes disrupted or stretched, it can distort the jet stream as well, pushing it southward in some areas and causing cold air outbreaks. The Arctic polar vortex is ...