On Thursday at 10:38 a.m. an updated cold weather advisory was issued by the National Weather Service valid from 7 p.m. until Friday 11 a.m. for Berkshire County. The weather service adds, "Very cold wind chills as low as 28 degrees below expected." 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.