Polar vortex, arctic

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, ...
A polar vortex is slated to sweep most of the continental US bringing winter storm warnings and a hazardous freeze to ...
Americans face dangerously cold temperatures as a polar vortex brings life-threatening conditions. Nighttime lows may drop to ...
Although people from all over the country, of all ages and backgrounds, joined the People's March, one protester said no one ...