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CHICAGO (AP) - Chicago got almost a foot of snow on Sunday, the most since the blizzard of 2011.

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The National Weather Service says snowfall at O'Hare International Airport totaled 11.5 inches as of 6 p.m. Sunday_the most since the Feb. 2, 2011 storm that dumped more than 20 inches on the city.

Snow-covered roadways made travel treacherous across Illinois and Chicago and airlines canceled about 1,300 flights as the storm pushed through the state.

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

Temperatures were expected to bottom out at minus 15 overnight and hover there during the day on Monday, with wind chills of 30 to 50 degrees below zero possible.

(Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)

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