Sunday 5 August 2012: Missed them!
No, not the turbines :-)
I forgot, on purpose, to take my camera with me when walking Jasper this morning, and so these clouds aren't a patch on the ones a bit earlier. Imagine layers and layers of plump and billowing duvets and blankets in many shades of grey and inky blue. They were gorgeous and what I've blipped is second best, but it will have to do.