Thanks for posting that, Grav!
A mighty anvil topped Cumulo Nimbus is one of nature's greatest spectacles.
I've never glimpsed one from the air which is perhaps just as well.
I did once read an account of a Boeing 707 flying through a Cb over the North Atlantic, and such was the power of the turbulence within that the aircraft became inverted at one point.
To the best of my recollection, it was a positioning flight with only the crew on board.
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