You better bundle up if you plan on heading out the door Friday morning. The National Weather Service issued a wind chill advisory for 13 northeastern Wisconsin counties, including Door and Kewaunee counties, from 11 p.m. Thursday until noon Friday. Wind chills are expected to be as low as 20 to 25 degrees below zero. The forecasted high temperature for Friday is eight degrees. With the dangerously low wind chills comes frostbite in as little as 30 minutes if your skin is exposed. The National Weather Service encourages you to wear appropriate clothing, such as a hat and gloves, and to use caution while traveling outside.