Place rocks around the fire to absorb and reflect heat. Do not eat snow. It will lower your body temperature. Melt it first. Stay in your car or truck.
Disorientation occurs quickly in wind-driven snow and cold.
Run the motor about ten minutes each hour for heat. Open the window a little for fresh air to avoid carbon monoxide poisoning. Make sure the exhaust pipe is not blocked. Make yourself visible to rescuers. Turn on the dome light at night when running engine.