The most well developed fluctus I've seen. Altocumulus stratiformis fluctus [OC]
The most well developed fluctus I've seen. Altocumulus stratiformis fluctus [OC]
![the background blur](https://lemmy.world/pictrs/image/d1869b90-9db4-4922-a04b-7fa606690fe1.jpeg?thumbnail=256&format=webp)
![](https://lemmy.world/pictrs/image/d1869b90-9db4-4922-a04b-7fa606690fe1.jpeg?thumbnail=1024&format=webp)
Picture taken in August 2022. Fluctus, also known as Kelvin-Helmholtz wave clouds, form when wind shear causes instability in the (usually the upper) surface of a cloud. The formation is short lived and relatively rare. It can also only be seen well from the side like here. This video contains a good explanation of the physics involved here.
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