On Thursday at 5:44 a.m. a cold weather advisory was released by the National Weather Service valid for Friday between midnight and 10 a.m. for Orange, Putnam, Rockland and Westchester counties. The weather service comments, "Very cold wind chills as low as 10 to 14 degrees below expected." "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.