What are hole-punch clouds, aka fallstreak holes?

Hole punch clouds over the Upper Midwest — CIMSS Satellite Blog, CIMSS

A fallstreak hole (also known as a cavum, hole punch cloud, punch

Lightening. Lightening, Light display, Scenic

Amazing cloud formations look like hand and legs of God

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How are what are Hole Punch Clouds formed? What are Hole Punch Clouds?

Rare mammatus clouds over regina saskatchewan canada page 1 – Artofit

Fallstreak holes, aka Hole Punch Clouds

How are what are Hole Punch Clouds formed? What are Hole Punch Clouds?