Chris, it's funny, but my daughter sent me the same series of pictures (in the form of a Powerpoint-presentation) a few weeks ago. They are really great! :thumb:
Now this thread rang a bell and so I went into my archives. And indeed, I found one more pic, which I photographed in the Swiss Alps - it looks almost like the smoke plume of a volcanic eruption! Paint such a cloud on a backdrop, and every visitor will explain you that clouds like this one simply don't exist!
Of course there's no such thing like volcanoes in the Alps, but this afternoon we sure had one hell of a thunderstorm! And this cloud was only a precursor of much more to come (torrents of rain and hail enough to do some skiing on it...)
Ron