polar vortex

Forecasters warn of a 'potentially catastrophic' US winter storm
The exact timing and path remain uncertain, but an arctic air mass from Canada is expected to clash with rain, creating a major winter storm.
Fire chief's beard freezes while fighting fire
Polar vortex: Iowa college student found dead on campus
What is a polar vortex?
Why is it about to get so cold in much of the country?
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Fire chief's beard freezes while fighting fire
Polar vortex: Iowa college student found dead on campus
What is a polar vortex?
Why is it about to get so cold in much of the country?