Dangerous below-freezing temperatures with even colder wind chills were settling in for much of the week across the Deep South ... Mattise in Nashville, Tennessee; and Lisa Baumann in Bellingham ...

Most of the U.S. will enjoy milder temperatures on Thursday, but the warmup will be brief as a polar vortex will send temperatures tumbling below freezing for most of the nation starting this weekend.

From Texas through the Deep South, down into Florida and to the Outer ... Record demands for electricity to stay warm were met by the Tennessee Valley Authority, which provides power to more ...