Iridescent clouds are a diffraction phenomenon caused by small water droplets or small ice crystals individually scattering light.

They often occur on lenticular clouds on top of a cumulonimbus, called pileus.

https://video.nostr.build/2aaaedfccfd1cb5ea2ba2f87f5be25080b7676d666c4a50e7a93a17fa0517491.mp4

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