Deep Freeze Across Chunks Of US With Crippling Wind Chills

CHICAGO (AP) — Air temperatures through much of the United States have plunged into the negative teens, twenties and even thirties.

And wind speeds added to that are making conditions downright dangerous.

A whirlpool of frigid, dense air known as a "polar vortex" is stretching from Montana to Alabama.

In Indianapolis, a travel emergency makes it illegal to drive except for emergencies or looking for shelter.