A fallstreak hole is a large gap, usually circular or elliptical, that can appear in cirrocumulus or altocumulus clouds. They are caused by supercooled water in the clouds suddenly evaporating or freezing.

https://video.nostr.build/0db8ef638d3049c3ac60959892226c5d0411e43985c800ed85bb4265cbc2842a.mp4

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