After a storm front blew through this patch of mammatus clouds appeared over Steep Mountain just a couple miles south of my home. They continuously shifted and evolved as the wind and weather conditions changed. As they were lifted upward into the laminar flow of the wind over the top of Steep mtn, they were shredded from their bulbous shapes into wispy strands of cirrus clouds and dissipated. This can be seen a little on the left side. I watched them for half an hour or so.

Google Pixel phone

Cropped and sharpened.