We had some nice clouds here yesterday evening. I took quite a few photos, and this is the best of them.But take a look at these (not mine :-):
They're lenticular clouds (Latin lenticularis, "little lentil"). Here's the link (scroll to the bottom for a larger version of this picture). And here is a very nice explanation (at, of all places, a site about an alternative theory to the Big Bang).
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