Wavy undulatus asperatus covers the sky of Alabama

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The skies above Alabama on Thursday were transformed into a rare display of a cloud.

The sky was full of undulatus asperatus, or “wavy,” clouds above Alabama as a mixture of sleet, snow and rain moved into the region on Thursday morning.

 

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Juan Gutierrez
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Butch Oglesby
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At SpainPark. Twitter / Sarah Gray ‏@thegr8motsey 6h6 hours ago

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just outside of Greystone. Twitter / Josh Parkinson ‏@jnparkinson
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Cloud formations ahead of the rain in Riverchase. Twitter / Daniel Cheek ‏@danimal357
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At Indian Springs. Twitter / Mitchell Frank ‏@MitchellFrank5
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These clouds are beautiful in Pelham Jessi ‏@jessijmurphy

Undulatus asperatus clouds are made up of well-defined, wavelike sometimes chaotic structures in the underside of the cloud.

These crazy wave clouds rolled over Lincoln NE on July 7, 2014:

The weird cloud formation is characterised by localized waves in the cloud base, either smooth or dappled with smaller features, sometimes descending into sharp points, as if viewing a roughened sea surface from below.

Varying levels of illumination and thickness of cloud can lead to dramatic visual effects.

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