Mammatus clouds mark the tail end of the storm. These are awe... on Twitpic

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1076 days ago

Mammatus clouds mark the tail end of the storm. These are awesome, and they're directly overhead.

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Just amazing! :)

Grey clouds mimic sand dunes deep in Martian craters - first impression.

Named after the boobies they resemble!

Very nice. Looks like the sky has come to a boil and it's time to throw in the macaroni