From Bushwalk Australia

A heavy snow storm with strong to violent winds, extreme cold temperatures and little or no visibility. It is potentially one of the most dangerous weather conditions for humans. Survival may depend on obtaining shelter and warmth promptly; hypothermia is a very real risk. In addition to appropriate clothing, a properly pitched four season tent, a hut, a ventilated snow cave, or other improvised shelter can be the difference between life and death.