Rare cloud formation wows onlookers
By: Melissa Hudson
Posted: Jun 21, 2019 1:32 PM EDT

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Video courtesy Amy Christie Hunter/CNN
(CNN) -- A rare formation of clouds wowed onlookers at Virginia's Smith Mountain Lake on Tuesday.
The photo shows Kelvin-Helmholtz Waves, which the National Weather Service defines as, "Vertical waves in the air associated with wind shear across statically-stable regions. Can appear as breaking waves and as braided patterns in radar images and cloud photos."
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