Someone I know referred to these type clouds as "Biblical". Apparently it is a term used.
Pam and I were in the Gulf region a few years ago. This is how the clouds looked the few days we were there. We've been back. On the return trip you expect the clouds to be the same... right? Well they were not. They were just the ordinary, run of the mill clouds. No Biblical references could be made to them.
I'm finding as we travel that you can find a magical place and it captivates you. You can't wait to go back. When you get back years or months later it is not the same. For whatever reason it just isn't.
But it sure was great to see these clouds night after night for a few days. Magical. Epic. Biblical.