BOONE, Iowa—Cold temperatures and strong winds have led the the National Weather Service to issues a Wind Chill Advisory for the area through noon Friday. Actually wind chill readings north of U.S. Highway 20 are expected to be low enough the receive an upgrade to a Wind Chill Warning. A Wind Chill Advisory is issued when the temperatures and wind combine to generate low wind chills that could result in frost bite and hypothermia if precautions are not taken. Forecasters are calling for wind chill at 20-to-30 degrees below zero through Friday morning. That is a range where frostbite could occur within 30 minutes. The wind chill is cold, but in 1996, record lows were set on the morning of the January 31st, the Boone Water Environment Weather Station with a reading of -32 degrees.