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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.

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.

provocative-planet-pics-please.tumblr.com Was sind das für Wolken? Obwohl ihre Ursache derzeit unbekannt ist sind solche ungewöhnlichen atmosphärischen Strukturen so bedrohlich sie aussehen mögen nicht die Vorboten eines meteorologischen Untergangs. Die Erscheinung der Undulatus asperatus wie sie informell genannt werden ist oft überwältigend und ihre Ausprägung ungewöhnlich. Sie sind kaum untersucht und wurden sogar als neue Wolkenart vorgeschlagen. Während die meisten niedrigen…

provocative-planet-pics-please.tumblr.com Was sind das für Wolken? Obwohl ihre Ursache derzeit unbekannt ist sind solche ungewöhnlichen atmosphärischen Strukturen so bedrohlich sie aussehen mögen nicht die Vorboten eines meteorologischen Untergangs. Die Erscheinung der Undulatus asperatus wie sie informell genannt werden ist oft überwältigend und ihre Ausprägung ungewöhnlich. Sie sind kaum untersucht und wurden sogar als neue Wolkenart vorgeschlagen. Während die meisten niedrigen…

This is a rare meteorological phenomenon called a skypunch. When people see these, they think it's the end of the world. Ice crystals form above the high-altitude cirro-cumulo-stratus clouds, then fall downward, punching a hole in the cloud cover. Freakishly weird!  
By Terry Boswell (Joshua Tree Earth & Space Museum)

This is a rare meteorological phenomenon called a skypunch. When people see these, they think it's the end of the world. Ice crystals form above the high-altitude cirro-cumulo-stratus clouds, then fall downward, punching a hole in the cloud cover. Freakishly weird! By Terry Boswell (Joshua Tree Earth & Space Museum)

This Upper Cretaceous specimen is a superb specimen of Shenodiscus lenticulares. It comes from the U.S. badlands, Fox Hills formation, South Dakota. The collector was also the preparator in this case and took great pride in this work of art.

This Upper Cretaceous specimen is a superb specimen of Shenodiscus lenticulares. It comes from the U.S. badlands, Fox Hills formation, South Dakota. The collector was also the preparator in this case and took great pride in this work of art.

Beautiful Mammatus clouds - appear ominous, but the sinking air required to make these clouds actually indicates weakening of the storm associated with them.

Mammatus clouds over Nebraska

Beautiful Mammatus clouds - appear ominous, but the sinking air required to make these clouds actually indicates weakening of the storm associated with them.

mammatus clouds in Regina, Saskatchewan, Canada after a thunderstorm, 6/26/12

mammatus clouds in Regina, Saskatchewan, Canada after a thunderstorm, 6/26/12

On either side of Lyme Regis, England but especially to the west on Monmouth beach, visitors can see a  layer of limestone famous for the large Ammonites it contains, known as the Ammonite graveyard or the Ammonite pavement.

On either side of Lyme Regis, England but especially to the west on Monmouth beach, visitors can see a layer of limestone famous for the large Ammonites it contains, known as the Ammonite graveyard or the Ammonite pavement.

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