No Photoshoppery here – Mammatus clouds are formed when the air is saturated with rain droplets and/or ice crystals, and begins to sink. They don’t precede a tornado or presage a storm; the worst of the storm is usually over when Mammatus are seen. The name “mammatus” is derived from the Latin mamma (breast), for the way they hang down, seeming to offer … something.
Pix all over the web, but these are some of the best I came across.
Music: The Mountain Goats :: Wild Sage
Holy cannoli, those clouds are unreal. I would be in a true state of awe if I saw clouds like those.