Some areas of the U.S. may see temperatures as low as -20 or -30 degrees early next week as arctic air from Siberia rolls in.

A polar vortex dipping down from Siberia will bring a cold front with frigid temperatures to nearly 300 million Americans.

A blast of Arctic air is set to cover much of the United States with temperatures below freezing starting on Friday and into ...

Snow and winds are likely to trigger flight cancellations and cause headaches for people traveling to DC for Inauguration Day ...

The most unusually cold air in the Northern Hemisphere will be over the United States early next week, bringing dangerously ...

The polar vortex is a ring of cold air that typically circles the Arctic. A strong jet stream essentially acts like a fence, ...

Americans were bracing Thursday for frigid temperatures that forecasters said could produce life-threatening conditions, with ...

Temperatures are expected to plummet over the weekend, bringing life-threatening conditions to large stretches of the United ...

People living "basically anywhere from the Rockies eastward" will see extremely cold temperatures over the next several days, ...

A polar vortex is bringing cold temperatures to the U.S., impacting Utah as well. Utah will experience its coldest ...