At 12:50 p.m. EST on Wednesday, the National Weather Service issued a cold weather advisory valid from 10 p.m. EST until Thursday 10 a.m. EST for Wexford County. 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. An extreme cold watch is issued when dangerously cold air temperatures or wind chill values are possible.