The polar vortex's blast of Arctic air from Canada brought the season's coldest weather to the majority of U.S. The vortex is ...

This blast of frozen temperatures is tied to a polar vortex... but what is that? Air spins around the notoriously cold North and South Poles. When the air is spinning fast, it's stable, but when it is ...

It's going to get cold in Tennessee. Meteorologists predict freezing temperatures for much of the state. Here's the latest.

People living "basically anywhere from the Rockies eastward" will see extremely cold temperatures over the next several days, ...

ANNAPOLIS, Md. (AP) — A huge swath of the U.S. was blasted with ice, snow and wind on Monday as the polar vortex that dipped south over the weekend kept much of the country east of the Rockies ...

Stakeholders and opponents descended on the Calgary offices of the Alberta Energy Regulator as a hearing over the controversial Grassy Mountain project resumed. The AER is deciding whether to approve ...

Recent forecasts suggest some Americans might be getting a much-needed break from the freezing temperatures that have gripped ...

A recent study explains how warmer temperatures at the top of the planet destabilize the jet stream and allow colder air to ...

NORFOLK, Va. (AP) — The plunging polar vortex brought subfreezing temperatures Tuesday to some of the southernmost points of the U.S., threatening to dump snow on parts of Texas and Oklahoma ...