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An extremely loud air blast would have followed, before seismic shaking about the size of a magnitude 7 earthquake.

The air blast broke windows and blew dust from the fallen stacks into homes.

Bruno Moretti, Allegheny County’s emergency management coordinator, said the air blast broke windows and blew dust from the fallen stacks into homes.

Videos recorded by the nonprofit Mount Washington Observatory show how the extreme cold and strong winds of more than 100 mph from the Arctic air blast walloped the summit Friday afternoon, and made the mountain with the tallest peak in the Northeast seem like another planet.

Photographer Grant Gunderson, who was on the trip, detailed the avalanche on social media and said Smaine “was thrown 50 meters by the air blast and buried and killed.”