Giant tsunami-shaped clouds
A series of huge breaking wave shaped clouds lined the horizon in Birmingham, Ala., on Dec. 16.
Giant Tsunami-Shaped Clouds Roll Across Alabama Sky - Yahoo! News
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Experts say the clouds were pristine examples of "Kelvin-Helmholtz waves." Whether seen in the sky or in the ocean, this type of turbulence always forms when a fast-moving layer of fluid slides on top of a slower, thicker layer, dragging its surface.
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