We all know how the media likes to exaggerate weather conditions with wind-chill temps and even by factoring humidity ("apparent temperature"), but the fact is the acutal ambient temperature on Mt. Hood has been on the 20's and 30's.
That's very survivable, and for more than a week, maybe two or even more.
We know that at one point at least one was holed up in a snow cave, and I'm really hoping the other two bailed-out on their attempted descent and dug in. That would have kept them completely out of the wind, and with 20F and 30F ambient outside, temps in a proper snow cave might easily go above 32F (freezing), giving them snow melt to drink (staying dry in the cave would have been their problem).
Since I have faith that they had the skill and wits to build a cave, I hope they made that decision and hunkered down before avalanche conditions became too threatening.