Nice pic, pitty about the telephone lines in the way, but that happens to me too sometimes. The shot is there but you don't have time to get a better position for loosing the shot. Still amazing cloud formation!

An interesting cloud formation. it almost looks like a cresting wave. Perhaps crop some of the sky above the clouds. Some perspective correction could be applied to straighten up the poles.

Looks like the start of a Shelf Cloud, really good capture and hope you didn't get wet