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  • Dawn Standley

    Cloudy with a Chance of Apocalypse This ominous looking sky was captured at sunset and shows great examples of mammatus clouds, which usually form on the undersides of thunderstorm anvil clouds. Nature kindly threw in a little lightning to complete the scene.

  • Georgianul Constantin

    Amazing cloud formations 6

  • Dotty Tessandore

    60 insane cloud formations from around the world [PICs] | Matador Network - I've seen these Mammatus clouds over Olympia, WA many years ago.

  • Debbie Ryan

    Bubble clouds?...

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Mammatus Clouds are pouch-like cloud structures and a rare example of clouds in sinking air. Sometimes very ominous in appearance, mammatus clouds are harmless and do not mean that a tornado is about to form - a commonly held misconception. In fact, mammatus are usually seen after the worst of a thunderstorm has passed.

♂ Sunset sunrise Mammatus Explosion red orange sky cloud

Australian photographer Ken Prior snapped the nearly visible brushstrokes in the above sky over Scotland. The photo is the result of a mysterious, as yet unclassified cloud type that's been showing up all over the United Kingdom and New Zealand, and wherever else Prior happens to have his camera pointed at the sky. Meteorologists are calling them asperatus clouds, while people who aren't insecure about being confused with the weatherman are using the more straightforward Jacques Cousteau clouds.

Same cloud formation, different angle. crd to Ryan McGinnis