Cloud collapse?

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Len W

Apr 11, 2021, 6:55:51 AM4/11/21
to Weather and Climate
I attach a spectacular movie clip of a cloud avalanche(?) in the Nepalese mountains.
I am wondering if any of you have thoughts on its initiation.
Was it a cloud avalalanche, a cloud collapsing?
Certainly a strong katabatic flow.
There could have been a sudden downburst from a cumulonimbus on the other side of the mountain. The air then would have just rushed down the twisting valleys.
There is a lot of billowing going on.

It seems a bit strange to see a cloud descending like this.



Apr 11, 2021, 7:41:23 AM4/11/21
to Weather and Climate
Powder snow avalanche with a good deal of entrainment 'fluidising' the density/gravity current-like flow. Note the the strong winds as the density current head arrives.

George in Edinburgh

Apr 11, 2021, 9:17:04 AM4/11/21
to Weather and Climate
I recall seeing this type of avalanche from Grindelwald in the Swiss Alps for the first time in the 1960's. Spectacular, with a distant roaring sound which slowly diminished as everything settled down.

Apr 11, 2021, 12:28:48 PM4/11/21
to Weather and Climate
What a beautiful video.  And those happy people so in tune with nature.

The format of the video (with the occasional exception such as over-rapid panning) should be an object lesson to those who for inexplicable reasons, use their smartphones in the vertical format.

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