DALLAS Many students across North Texas were met with freezing temperatures as they returned back to school Monday morning after the holiday break.

A whirlpool of frigid, dense air known as a 'polar vortex' was expected to suppress temperatures in more than half of the continental U.S. starting into Monday and Tuesday, with wind chill warnings stretching from Montana to Alabama.

At about 6 a.m., temperatures ranged from 11 degrees in Denton and Abilene to 18 degrees in Fort Worth and Longview.

'Now, we have those wind chills, which have been below zero at times,' warned meteorologist Greg Fields.

A wind chill advisory was scheduled through 9 a.m.

At about noon, North Texas will head into the upper 20s, and by 5 p.m. hit 33 degrees, Fields said.

DISD returns to school Tuesday.

The Associated Press and WFAA's Marcus Moore contributed to this report

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