
Wikipedia:
Kelvin Helmholtz instability clouds in San Francisco.These clouds, sometimes called “billow clouds,” are produced by instability, when horizontal layers of air brush by one another at different velocities. A better name might be van Gogh clouds: It is widely believed that these waves in the sky inspired the swirls in van Gogh’s masterpiece Starry Night
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aslowdescent reblogged this from johnzanussi and added:
I caught a picture of this type of cloud up in New Hampshire once. Crazy cool looking.
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