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

From preparing your car to staying safe outdoors, here’s everything to know about getting ready for the incoming colder temperatures.

"Once the snow starts to come in, the temperature will essentially drop like a rock," Fox Forecast Center Meteorologist Marissa Lautenbacher told The Post.

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

The 10 Weather Impact team issued Alert Days for next week because of the polar vortex being responsible for the cold temperatures.

A major cold blast is in store for millions of Americans as a lobe of a polar vortex will bring brutally cold temperatures to nearly every American east of the Rockies.

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These severe cold events occur when the polar jet stream – the familiar jet stream of winter that runs along the boundary between Arctic and more temperate air – dips deeply southward, bringing the cold Arctic air to regions that don’t often experience it.

FOX59 Meteorologist Ethan Rosuck provided an update on the dangerous cold Indianapolis could see at the start of the work week.

The intense cold snap about to settle over most of Canada and the U.S. has been dubbed a “polar vortex’, but Environment Canada Senior Climatologist David Phillips says it could just as easily be called “Arctic air or Siberian air.”

Erin Davis/Axios Visuals An invasion of frigid air from the Arctic is sweeping south from the Plains and Ohio Valley Sunday, moving towards the Southeast and East. Threat level: The colder-than-average temperatures threatens public health for those exposed to the wind and cold,