Kelvin-Helmholtz Wave Clouds
Kelvin-Helmholtz wave clouds over the Front Range of the Rocky Mountains, Colorado. Kelvin-Helmholtz wave clouds are formed when there are two parallel layers of air that are usually moving at different speeds and in opposite directions. The upper layer of air usually moves faster than the lower layer because there is less friction. In order for us to see this shear layer, there must be enough water vapor in the air for a cloud to form. Even if clouds are not present to reveal the shear layer, pilots need to be aware of invisible atmospheric phenomenon.
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Photo credit: © Photo Researchers / Alamy / Afripics
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