A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of ...

The unseasonable chill that has swept through the eastern half of the US defies last year's mild winters and the South's ...

Abnormal weather events and severe winter storms could be caused by a disrupted polar vortex. Find out here how the polar ...

Cold air from the arctic sometimes dips southward across the American plains. What to know about the polar vortex.

It's like "bomb cyclone" or "firenado." It seems like the sort of phenomenon that would be responsible for the ...

With last week's freeze being the second time temperatures dipped below freezing this winter, many are wondering if this ...

Arctic air has brought chilling temperatures as low as 12 degrees to New York City — but are we in a polar vortex? A polar ...

Polar vortex brings frigid air to US, making Trump's inauguration coldest in 40 years, moved indoors due to cold.

Here is what is and isn't a polar vortex when Colorado receives cold like what is forecast for the holiday weekend.

The cold temperatures are coming from a not uncommon expansion in the Polar Vortex, which are counter-clockwise rotating air ...