Fluffy sharks in the sky

Fluffy sharks in the sky
Kelvin-Helmholtz instability clouds form from differences in air density between adjacent layers and the resulting wind shear. These clouds are extremely short-lived, and break in the same fashion as a wave on a shore – as the bottom layer moves slower than the top layer, and the top billows over and crashes.

Source:
http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2015/07/28/shark-fins-in-the-sky-awesome-kelvin-helmholtz-clouds-from-the-galapagos/

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