Kelvin-Helmholtz clouds resemble waves breaking in the ocean. These clouds are formed between two layers of air with different densities and traveling at different speeds. If a warm, less dense layer of air exists over a layer of colder, denser air, and the wind shear across the two layers is strong enough, eddies will develop along the boundary. Evaporation and condensation of the eddies render them visible as wave shaped clouds.The cloud is named after Lord Kelvin and Hermann von Helmholtz who studied the dynamics of two fluids of different densities when a small disturbance, such as a wave, was introduced at the boundary connecting the fluids. The Kelvin–Helmholtz instability occurs not only in clouds but also in the ocean, Saturn's bands, Jupiter's Red Spot, and the sun's corona.
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「ケルビンヘルムホルツ雲」
密度の異なる2つの空気層で形成される、砕ける波の連続模様に似た雲。
以前に海外のビーチで見かけたけど、結構ラッキーな気分になったなぁ!