A winter storm warning has been posted for a large area of southwest Wyoming, including the cities of Rock Springs, Green River, Evanston and Pinedale.
Frostbite can occur in less than five minutes in such conditions, so dress appropriately if you go outside and take extra care to protect extremities such as fingers, toes, ear lobes and the tip of your nose.
Crews are fanning out from the fire's edge into Wyoming in search of areas where firefighters could directly engage the flames with a high probability of success.