Bitter Cold Temperatures Return After Brief Warmup

(CBS) -- Bitter cold temperatures have returned to the Chicago area after a slight warmup yesterday.

As of 11 a.m., the temperature at O'Hare was 19 degrees. Temperatures are expected to fall Sunday evening to six degrees below zero with a wind chill of minus 20. A Wind Chill Advisory from midnight Sunday until 9 a.m. Monday.

Monday's high is forecast to be 10 degrees.