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
{{Information |Description=Kelvin Helmholz wave 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