A fallstreak hole – also known as a cavum, hole punch cloud, punch hole cloud, skypunch, cloud canal, or cloud hole – is a large gap, usually circular or elliptical, that can appear in cirrocumulus or altocumulus clouds. The holes are caused by supercooled water in the clouds suddenly evaporating or freezing, and may be triggered by passing aircraft.
A fallstreak hole – also known as a cavum, hole punch cloud, punch hole cloud, skypunch, cloud canal, or cloud hole – is a large gap, usually circular or elliptical, that can appear in cirrocumulus or altocumulus clouds. The holes are caused by supercooled water in the clouds suddenly evaporating or freezing, and may be triggered by passing aircraft.
Source: Wikipedia "Fallstreak hole" · CC BY-SA 4.0
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