GMC 1994 Yukon Owner's Manual page 193

If You're Caught in a Blizzard
If you are stopped by heavy snow, you could be in a serious situation. You
should probably stay with your vehicle unless you know for sure that you
are near help and you can hike through the snow. Here are some things to do
to summon help and keep yourself and your passengers safe: Turn on your
hazard flashers. Tie a red cloth to your vehicle to alert police that you've
been stopped by the snow. Put on extra clothing or wrap a blanket around
you. If you have no blankets or extra clothing, make body insulators from
newspapers, burlap bags, rags, floor mats
-
anything you can wrap around
yourself or tuck under your clothing to keep warm.
You can run the engine to keep warm, but be careful.
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