Earth’s magnetic north is not static. Like an anchorless buoy pushed by ocean waves, the magnetic field is constantly on the move as liquid iron sloshes around in the planet’s outer core.

Much of the U.S. from the Rockies into the Northern Plains will see colder than normal temperatures starting Sunday into the coming week, including forecasted wind chills down to minus 40 degrees F (minus 40 degrees C) or colder in the Dakotas and northern Minnesota, National Weather Service Meteorologist Marc Chenard said.

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.

Residents across the country from the Northern Plains to the tip of Maine are bracing for dangerously low temperatures

Major winter storm brings heavy snow to East Coast as Arctic blast puts millions under warnings from Plains to Maine

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

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.

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.

NEW ORLEANS — The vast majority of Americans are about to get an extended taste of frigid Siberian weather. Another polar vortex disruption will stretch Arctic air across the top of the globe, with expected frigid conditions in the nation’s capital severe enough to force Donald Trump’s second inauguration indoors on Monday.

Americans have been warned to brace for more winter storms as Arctic winds are set to dump more ice and snow amid freezing temperatures.

Sunday snowfall was just the start of a chaotic week of weather. Much of the Eastern Seaboard will be enduring some of the coldest temperatures this winter.