A severe tropopause fold decided to shove stratospheric air down the Alaska Range and right into the Anchorage airport during the time my parents were supposed to fly out. The airport has grounded all flights, and as tragic as that is, the rarity of this event is pretty crazy. pic.twitter.com/iIl3IDatNq

— Dr. Levi Cowan (@TropicalTidbits) December 23, 2022