We had a snow like that last December in KS -- 2 feet of blowing snow over a 36 hour period. I was snowed in for nearly a week because we couldn't get the car out the driveway. My DH was able to get out with the 4WD truck thank goodness. I didn't have chickens at that time, but I bet the coop would have been a disaster. It is pretty tight, but of course there has to be ventilation.
I got to thinking what I would do if that happened to my girls. I guess I would bring down the smaller tractor coop and put it in the garage for them. The car would have to live in the shed. If it were protected from the elements, it would be fine for a short period of time. Thanks for reminding me to have a plan b just in case.
Wow. Shudder.