“Malo periculosam, libertatem quam quietam servitutem.”
Notice the virga dropping from the top layer. As is falls it evaporates ahead of the main cloud building and churning just below it. And then the evaporated moisture sustains the lower level cloud and it builds even more.
I love watching these beasts form and move.
That is known in the aviation community as a Nymphocumulus - a big f**king thunderstorm.