Three separate rounds of Arctic air have already swept across the central and eastern United States through mid-December, courtesy of a displaced polar vortex positioned near Hudson Bay, Canada. If ...

It's only early November, but here comes the “polar express,” weeks ahead of schedule. A cold blast more typical of early December will stretch from the Northeast all the way down the Atlantic Coast ...

Meteorologists warn that a new blast of Arctic air is likely to sweep into Western and Central Canada in the coming weeks, raising the chance of another deep cold spell linked to a polar vortex shift.