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Cloud Formation Over New Zealand At Sunset.Undulatus asperatus (or alternately, asperatus) is a cloud formation, proposed in 2009 as a separate cloud classification by the founder of the Cloud Appreciation Society. If successful it will be the first cloud formation added since cirrus intortus in 1951 to the International Cloud Atlas of the World Meteorological Organization.The name translates approximately as roughened or agitated waves.

Slate Magazinefrom Slate Magazine

Powerful Microburst Flattened Part of a Montana Forest in 1999 (PIC)

The Most Powerful Weather Phenomenon You've Never Heard Of: The Microburst

Hovering in the sky, this rainbow cloud over Mount Everest took an astonished astronomer by surprise. Oleg Bartunov, 51, caught the spectacle on camera during a Himalayas expedition in Nepal.

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Colmer's Hill

♥ Clouds are Amazing..we just saw clouds like this when we had the girls...they were really cool looking...this is beautiful

Nacreous Clouds ~ sometimes called mother of pearl clouds, rare but once seen never forgotten. Mostly visable within 2 hour after sunset or dawn. McMurdo Station, Antarctica by Deven Stross

My dad taught me about these when I was a child. From previous pinner: Not every cloud has a silver lining; this multi-coloured cloud looks as if a rainbow has formed high in the heavens. The phenomenom - called a sundog - happens when ice crystals appear in clouds and refract the sun's rays. Photographer Robert Arn captured the cloud in Heyworth, Illinois, America. Picture: Robert Arn/solent