A new blast of Arctic air sweeping from north to south will bring bone-chilling temperatures to millions of Americans this weekend and next week.

NGM Maps When we anchored the boat at the fjord ... Then, at two in the morning, a crew member woke us up. He had spotted a polar bear approaching in the distance under the midnight sun.

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 ... and Upper Midwest will bear the brunt of these extreme ...