cloud busting

I was out on Exmoor photographing and this was a classic example of turning around and realising your facing the wrong way!!! something landscape photographers will be aware of happening when your zoned out taking a shot....

Very rarely do i see a storm cloud building with such symmetery and with such defintion.

So this is a handheld shot, i had to crop a fair bit off the bottom because of raking shadows (mine included) ....

Nothing like the examples of huge storm clouds we see from the states but i like to think this is the south wests more subtle smaller scale example....