Yesterday I frostbit my cheek in the groundstorm (piqsuq). I was only outside for about 5 minutes, and when I came in and touched my face I thought I had water frozen on my skin. I almost tried to scratch it off. It happened when I was trying to put a board to divert the wind away from our intake/exhaust pipe for our heater because of the bernoulli effect caused by the strong north wind. It was causing our intake fan to honk hoooonk hooooooooonk as it struggled to pull air in. Anyways, my skin was hard, softened after a while, it feels puffier and thicker kind of like leather, and number like I had a novocaine shot near the area. Apparently that's from damaged nerves that froze. It doesn't look dramatic, but I'm glad it's not worse. This was superficial, next I think I would have developed a big blister on thawing, and it would have really hurt bad they tell me. Mikey looked up ways to prevent it from being worse, I'm glad he could look info up for me.
I ended up just taking the intake hose off the wall mount from inside, and taping the hole shut. That was a lot easier than what I had been trying to do. So now it sucks air from in our house, runs it through the burner and blows it outside, instead of sucking air from outside, then cycling it through.