I'd call those clouds 'front' clouds. Where two fronts collide, one warmer and one cooler you get those striated clouds. You can see more of the little 'collision' clouds in and above the more solid cloud in left screen.
Those are great photos and I'm glad you waited around long enough to get the really good sunset. But that first photograph is art quality. That path that has a curve and straight gives it depth and perspective. It would make a good subject for a painter...
Thanks for another great walk. I ALWAYS appreciate them.
I used to know so much about clouds when I was younger and clearly have forgotten
as I read what you were saying some of it came back to me so thanks for the info and getting my memory banks working again
Such a kind comment on the first photo is truly appreciated