Well, we know, we really can produce realistic, abstract or monumental looking clouds using the great Vue cloud system.

But real nature can do astonishing stuff, too !

Take a look at this real photo of a weird cloud formation, called 'Morning Glory Cloud' :

en.wikipedia.org/wiki/File:MorningGloryCloudBurketownFromPlane.jpg

and more details about it here:

en.wikipedia.org/wiki/Morning_Glory_cloud

A basic Vue preset atmosphere seems to be coming close to this weird, but controlled looking formation - in the atmosphere 'Physical' folder called 'Blue Poluted' ... ( for sure you can come closer than this with Vue's features ...