Freeze skyrockets number of canceled flights

On Monday morning, Nashville was 40 degrees colder than Albany, New York. Memphis, Tennessee, was 20 degrees colder than Anchorage, Alaska. And Atlanta was colder than
Moscow.

But the U.S. South was downright balmy compared to the Great Lakes region, where temperatures hovered in the negative 20s -- before wind chill, which dropped temps to the negative 50s, making it very dangerous to go outside.

The bitter cold that a "polar vortex" is pushing into much of the United States is not just another winter storm. It's the coldest in 20 years in many areas, and breaking some
records.

More than 3,400 flights nationwide were canceled by noon ET Monday, according to flightaware.com.

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While the current weather patterns gave the Northeast a bit of a reprieve, it's in for a brutal drop as the arctic air works its way east. New York, where it's about 50 degrees
with wind chill Monday morning, could go as low as minus 7 on Tuesday, said CNN meteorologist Indra Petersons. The region could face a 60-degree temperature change in a
single day.

The temperature spread within the United States is a stunning 130 degrees, CNN meteorologist Dave Hennen said, with wind chill putting northern Minnesota at 60 below zero, while Key West, Florida, basks in its dreamy 70 degrees. Much of the West can also expect relatively pleasant weather through Tuesday.

But from Minneapolis to Chicago to Milwaukee, people are under health warnings to stay indoors. Many schools have closed.

"Skin freezes in just five minutes with a wind chill of minus 50," said HLN meteorologist Bob Van Dillen.

Frostbite occurs in 10 minutes with wind chills of minus 35, Hennen added.
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