What are hole-punch clouds, aka fallstreak holes?

Fallstreak hole - Wikipedia

Unusual Cloud Formations occurring on Earth

Making Sense of Holes in the Clouds

The sky is amazing this evening. 1/7/18. These are the actual

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

Fallstreak hi-res stock photography and images - Alamy

Mamma (or mammatus) are the clouds at the base of storm clouds

Fallstreak hole: Unusual 'holepunch' cloud captured in East Midlands

Why are there holes in those clouds?

Mind-Blowing Cloud Formations You Probably Haven't Seen Before

Nuvem de Asperatus em Oklahoma, EUA, mostrando um vislumbre do

Pin by pau !! on eye candy→ Greek gods and goddesses, Greek

How Hole-punch Clouds Work

Hole Punch Clouds - Fallstreak Holes - Crystalinks

What are Fallstreak Holes in Clouds? - The Natural Navigator