An arctic blast will send temperatures across the United States plummeting as bitterly cold air that originated in Siberia will arrive from Canada by week’s end, bringing with it dangerously cold wind chills for millions of Americans.

An Arctic air mass, sometimes known as a Siberian Express, is expected to move over Michigan by Sunday and will leave Michigan residents with below-zero temperatures for days, the National Weather Service said.

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

Americans were bracing Thursday for frigid temperatures that forecasters said could produce life-threatening conditions, with Donald Trump's inauguration expected to be the coldest in 40 years.

The temperature is predicted to be around 22 degrees during the swearing-in, the coldest since Ronald Reagan’s second inauguration.

The polar vortex is a large area of low pressure, winds, and cold air surrounding both of the Earth’s poles, according to the National Weather Service. The term “vortex” refers to the circulation of air that helps keep the colder air near the Poles. This vortex has always existed and is not something new.

Snow and ice across the U.S. South are expected to relinquish their grip only slowly as the weekend continues.

The National Weather ... pushed cold weather into central states, like Ohio. Pic: AP The winter storm is being driven by a polar vortex, usually located around the North Pole, which has dipped ...

Fire-struck America faces fresh misery from a ‘Siberian Express’ winter storm threatening a near nationwide whiteout. As California battles the worst wildfires in its history, the rest of the United States is braced for a minus-20C horror freeze.

Lala survived illegal wildlife trafficking in the Bolivian Amazon and now lives in a sanctuary with other rescued big cats. As a filmmaker and photographer, Odom travels to remote places to document our planet’s biodiversity and the threats to endangered creatures like Lala.

A joint Japanese-European mission to Mercury just made its sixth flyby of the planet, revealing stunning close-ups of the permanently shadowed craters at Mercury's north pole.

Parts of Mississippi can expect snow, below-freezing temperatures, lows in the teens next week. Know how to prep your home, family, pets for the cold.