arctic blast, Polar vortex

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.
These severe cold events occur when the polar jet stream – the familiar jet stream of winter that runs along the boundary ...
A polar vortex is slated to sweep most of the continental US bringing winter storm warnings and a hazardous freeze to ...
An arctic air mass settled over New York City and much of the country Sunday evening, bringing a deep freeze and the chance ...