Cloud collapse?

[Len W]

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.

https://www.youtube.com/watch?v=vTzRntsUVOc

Len

Wembury

[Smartie]

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.

D

[George in Edinburgh]

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.

[jack.h...@gmail.com]

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.

Jack