He had food in his tummy, and he died in a snowstorm, not a superstorm . Miraculously, the atmosphere did not flip over. That's because it can't. Even high school freshpeople know that there is very little convective admixing of air between the stratosphere and the troposphere. No, it isn't, unless it's a class in science fiction.
Supercooled water is water that remains liquid but is below freezing.
Maybe supercooled air remains gaseous at temperatures below its liquefication point, which isn't much above absolute zero. Sure wish they would.