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

The polar vortex will soon elongate over North America with a dangerous cold moving into sections of Canada and the U.S.

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.

The polar vortex set to hammer much of the country with ... temperatures are expected to drop in central areas of New Mexico — including Santa Fe and Albuquerque — leading to temperatures ...

This cold wave, fueled by large-scale pressure changes and a disruption of the polar vortex, is expected to bring the coldest ... with possible frost reaching the Gulf of Mexico and the Florida ...

The plunging polar vortex brought subfreezing temperatures ... along Texas' border with Mexico, to 31 degrees (minus 0.5 Celsius), with an expected wind chill factor ranging from 0 to 15 degrees ...