COLD WEATHER ADVISORY IN EFFECT FROM 4 AM EST /3 AM CST/ TO 1 PM EST /NOON CST/ FRIDAY... * WHAT...Very cold wind chills between 15 and 25 below zero expected. * WHERE...Portions of northern Indiana and southwest Michigan. * WHEN...From 4 AM EST /3 AM CST/ to 1 PM EST /noon CST/ Friday. * IMPACTS...The dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves.