Mammatus clouds are ominous and beautiful

Mammatus clouds are ominous and beautiful

View at EarthSky Community Photos. | Michael O’Connor captured this image on July 12, 2025, from Michigan and wrote: “Mammatus clouds. First time ever seeing them.” Thank you, Michael! Mammatus clouds: Ominous and beautiful Mammatus clouds are pouch-like protrusions hanging from the undersides of clouds. You’ll usually find them under thunderstorm anvil clouds. But you might see them under other types of clouds as well. They’re composed primaril…