A Hole in the Sky! Cloud Formation called Cavum.
A well-defined generally circular sometimes linear hole in a thin layer of supercooled water droplet cloud. Virga or wisps of Cirrus typically fall from the central part of the hole, which generally grows larger with time. Cavum is typically a circular feature when viewed from directly beneath, but may appear oval shaped when viewed from a distance.
When resulting directly from the interaction of an aircraft with the cloud, it is generally linear in the form of a dissipation trail. Virga typically falls from the progressively widening dissipation trail.
Occurs in Altocumulus and Cirrocumulus and rarely Stratocumulus. https://cloudatlas.wmo.int/en/clouds-supplementary-features-cavum.html
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