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.

Severely cold winter weather is set to hit Knoxville, prompting warming shelters to open starting the night of Jan. 19.

A polar vortex could cause light snow over the weekend in Knoxville. A polar vortex is to blame for freezing temperatures.

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

Get ready for a blast of arctic air this weekend, Nashville. The National Weather Service is anticipating 72 hours of below-freezing temperatures after Saturday. Here's what to expect.