Unusual Clouds Today in South Yorkshire

Spotted these unusual clouds in South Yorkshire this morning, i believe they are altocumulus undulatus clouds.

They usually form in an area of instability and wind shear.
Basically, there are a series of waves where the clouds are.
Where the air is rising you have a cloud stripe, and where the air is sinking it is clear.
These are also sometimes called billow clouds.

altocumulus undulatus clouds

altocumulus undulatus clouds

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