Carbon monoxide poisoning can happen without the victim being aware of it until it's too late. Being stuck or stranded in a South Dakota winter storm can become a question of survival. It's serious business and you and your vehicle must be prepared. Stay in the vehicle. Do not attempt to walk in a blizzard.
Disorientation comes quickly in blowing and drifting snow.
Being lost in open country during a blizzard is extremely dangerous. You are more likely to be found in your vehicle and you will be sheltered there. Avoid overexertion and exposure. Be aware of carbon monoxide. Burn candles and run the engine and heater sparingly, and only with a down-wind window slightly open for ventilation.