Abnormal weather events and severe winter storms could be caused by a disrupted polar vortex. Find out here how the polar vortex affects the weather.

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.

A polar vortex is currently hitting the United States, with schools closed in many areas and at least four deaths caused by treacherous conditions.

Very cold arctic air will interact with several systems to bring chances of freezing rain, sleet, and snow

Residents across the country from the Northern Plains to the tip of Maine are bracing for dangerously low temperatures as tens of millions of residents along the East Coast contend

The polar vortex of ultra-cold air usually spins around ... More than 50,000 customers were without power on Wednesday in Indiana, Kentucky, Louisiana, Virginia and West Virginia, according ...

The polar vortex of ultra-cold air usually spins around ... More than 50,000 customers were without power on Wednesday in Indiana, Kentucky, Louisiana, Virginia and West Virginia, according ...

The plunging polar vortex is bringing subfreezing temperatures to some of the southernmost points of the U.S. A forming storm system is threatening to dump snow on parts of Texas

A rare winter storm is getting set to slam the Gulf Coast and South, with cities from Texas to Florida under Winter Storm Warnings.

A rare winter storm is set to blanket the southern US in snow and ice as the entire East sees temperatures plunge to their lowest point this winter, bringing 'life-threatening' conditions.

BOSTON — Residents across the country from the Northern Plains to the tip of Maine are bracing for dangerously low temperatures as tens of millions of residents along the East Coast contend with a thick blanket of snow — and more snowfall in the forecast.