Kelvin-Helmholtz Clouds

Have you ever seen clouds that look like ocean waves? They're called Kelvin-Helmholtz clouds, aka billow clouds or shear-gravity clouds. They look like breaking ocean waves.

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"The atmospheric internal waves that form wave clouds are created as stable air flows over a raised land feature such as a mountain range, and can form either directly above or in the lee of the feature. ... If there is enough moisture in the atmosphere, clouds will form at the cooled crests of these waves."

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"An extremely rare phenomenon where a cloud produces a billowing wave pattern. They occur when there is a strong vertical shear between two air streams causing winds to blow faster at the upper level than at the lower levels."

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I found this photo on the interwebs by abc.net.au

Well for the first time, I saw some clouds like these! When I first spotted them, the waves looked much like the ones in the photo above. But by the time I was able to take a photo (through a window screen), the waves had deteriorated a bit. I think you can still get the idea.

Interesting!