The weather service says to expect, "Very cold wind chills as low as 5 to 10 degrees below." "The cold wind chills could result in hypothermia if precautions are not taken," explains the weather service. Understanding cold weather alertsCold weather advisory: Be Aware. A cold weather advisory is issued when seasonably cold air temperatures or wind chill values, but not extremely cold values, are expected or occurring. An extreme cold warning is issued when dangerously cold air temperatures or wind chill values are expected or occurring.