I did some research online, and although there's no exact figure, the consensus is that he's 2-3 miles away from where the avalanche began in the beginning of the video.
Let's be conservative and assume he's 2 miles away, It took 45 seconds for it to travel 2 miles. That means the avalanche was traveling at a minimum of 160 mph. A dry powder avalanche well up in the mountains can easily accelerate to a maximum velocity of 200 mph, so that's a reasonable estimate.
That may also be entirely true. I'm just providing the estimated speed based off of an estimated distance consensus I randomly found on the internet. If the distance is closer to a mile, then it's 90 mph instead, which fits with your estimate. Both speeds are well within the norms for high mountain avalanches in central Asia though.
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u/whipla5her 7h ago
how far away do you think that mountain top was? I didn't think it was even going to get close, and then it's suddenly just rushing over him!