Lenticulars are a visible sign of mountain waves in the air. This particular cloud is a classic example of an orographic wave cloud—for scale, notice the truck in the bottom right corner—what you don’t see in this image are the mountains to the left.
A good visualization of how these form is to picture ripples created by water flowing over an obstruction in a stream.
I first photographed one of these clouds in Idaho. It looked for all the world like a massive wedge tornado…but, no rotation, and it was a storm-free afternoon. Years later, Gavin Pretor-Pinney of the Cloud Appreciation Society https://cloudappreciationsociety.org/ identified it for me as lenticular.
I can’t see these clouds without David Bowie’s 1969 song, Space Oddity, running through my head.
This cloud hovered for perhaps ten minutes then vanished. And the truck? It disappeared too…
it's (almost always) about the water... 
It’s truly incredible what you – SG – find and see and seek out and know about. Pretty darn gorgeous! Bowie is definitely involved. It brings to mind the Muir quote which you must have used, I am sure: In every walk with nature one receives far more than he seeks.
Thanks, Jenny. I do love that quote; it represents how I feel. Watching weather interact with the environment is fascinating!