What are hole-punch clouds, aka fallstreak holes?

Why are there holes in those clouds?

Making Sense of Holes in the Clouds

This thunder cloud looks eerily like an enormous bird of prey

ITAP Sunset after tornado - Claremore Ok

Hole Punch Clouds - Fallstreak Holes - Crystalinks

Angels' Photos: Angel from Above Photo

grand canyon in winter solstice light

Fallstreak hole - Wikipedia

The science behind hole-punch clouds and why you might see them

How to Enlarge a Hole with a Hole Saw • Ron Hazelton

How to Graph a Rational Function with Holes, Precalculus

html - Polygon with a hole in the middle with HTML5's canvas

Child with Hole in Heart Undergoes Non Surgical Closure - SPS Hospitals

Erythematous nodule with central hole on the inferior middle third of