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Undulatus Asperatus clouds, nicknamed "River in the sky," form over Atlanta

6:10 AM, Feb 26, 2014   |    comments
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Courtesy: WXIA

 


 


ATLANTA (WXIA) -- Rare clouds nicknamed "River of the Sky" greeted morning commuters in Atlanta Tuesday. The scientific name is Undulatus Asperatus.

WOW! See these beautiful photos of the cloud formations

11Alive Meteorologist Chesley McNeil said the clouds are very rare in the southeast, but more common in the midwest. He also says there's debate over what causes the phenomenon. Scientists agree it's a meeting of two fronts, but are split on whether it's caused by a cold/warm front or a dry/moist front. The Royal Meteorological Society is documenting their appearance to see if they deserve a separate cloud classification. If that happens, it would be the first cloud named since 1951.

"They're very ominous looking," McNeil said. "They're rolling, and that's where the name 'river of the sky' comes from." The name is roughly translated "roughened or agitated waves".

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