Avoid outside activities if possible. When outside, make sure you wear appropriate clothing, a hat, and gloves. Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves.

WIND CHILL WARNING NOW IN EFFECT UNTIL NOON CST TUESDAY... ...WIND CHILL ADVISORY NOW IN EFFECT FROM NOON TUESDAY TO 9 AM CST WEDNESDAY... * WHAT...For the Wind Chill Warning, dangerously cold wind chills. Wind chills as low as 25 to 40 below zero. For the Wind Chill Advisory, very cold wind chills expected. Wind chills as low as 15 to 30 below zero. Lowest wind chills will be at night and during the morning. * WHERE...Portions of north central and northeast Illinois. * WHEN...For the Wind Chill Warning, until noon CST Tuesday. For the Wind Chill Advisory, from noon Tuesday to 9 AM CST Wednesday. * IMPACTS...The dangerously cold wind chills could cause frostbite on exposed skin in as little as 10 minutes.