Well not really, but almost. These clouds that were brewing had some stuff in them. On this first one , over the houses you can see that special tail, I forgot what they call it, forming.
I'm not 100 percent sure this is a cloud. It could be a space ship cleverly concealed as a cloud. <grin>.
The B&W version is a bit more dramatic. :-))
This last one is very cool for me because you can see the rotation in the main part of the cloud above that hook tail.