The Current Temperature map shows the current temperatures color ... In most of the world (except for the United States, Jamaica, and a few other countries), the degree Celsius scale is used ...

According to the NWS, the Arctic polar vortex is a powerful band of west-to-east winds that develops in the stratosphere, ...

A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of ...

These live maps from the FOX Forecast Center show the latest information on the historic winter storm expected to blanket the ...

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

Most of the United States is being assailed with extreme winter weather this week as Arctic air blasts south from Canada, ...

This upcoming system is expected to usher in even colder conditions, with some areas bracing for single-digit lows and ...

Follow NBC News live updates for the latest coverage of the freezing winter weather affecting large swaths of the U.S., from ...

A polar vortex is slated to sweep most of the continental US bringing winter storm warnings and a hazardous freeze to ...