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BBC Science Focus
|November 2025
These distinctive clouds are named after the two physicists - William Thomson (Lord Kelvin) and Hermann von Helmholtz - who studied the phenomenon that forms them. The peculiar wavelike shape of Kelvin-Helmholtz clouds is caused by two layers of the atmosphere moving at different speeds above and below the cloud layer.
When warmer, less dense air above the cloud is moving faster than the cooler, denser air below, it causes ripples to form on the top of the cloud, much like how wind causes ripples on a lake.
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