It is usually seen in thin cirrostratus, cirrocumulus, and altocumulus clouds.
From the ocregister.com
Altostratus and altocumulus are the common mid-level clouds, Nasiri explains.
From the sciencedaily.com
Altocumulus castellanus suggests instability in the middle layers of the atmosphere.
From the smh.com.au
On the right, at a lower altitude, is an altocumulus cloud containing supercooled water droplets.
From the newscientist.com
Altocumulus floccus producing virga near top and middle of image merging into altostratus near horizon.
From the en.wikipedia.org
If the altocumulus is mixed with moisture-laden altostratus, the precipitation may reach the ground.
From the en.wikipedia.org
The background is a sunset through altocumulus clouds.
From the sciencedaily.com
Above, altocumulus lay like bubble wrap in the blue.
From the telegraph.co.uk
They noticed a hole in an otherwise solid deck of altocumulus clouds in the forward imagery, as well as a burst of snow that extended to the ground.
From the sciencedaily.com
More examples
A cumulus cloud at an intermediate altitude of 2 or 3 miles
Altocumulus (Alto, "high", cumulus, "heaped") is a cloud belonging to a class characterized by globular masses or rolls in layers or patches, the individual elements being larger and darker than those of cirrocumulus and smaller than those of stratocumulus. ...
Mid-altitude clouds with a cumuliform shape.
Composed of flattened, thick, gray, globular masses, this middle cloud genus is primarily made of water droplets. In the mid-latitudes, cloud bases are usually found between 8,000 and 18,000 feet. ...
Grey to white clouds that form in groups or globular masses and look like rolls in layers or patches. When holding your extended hand to the sky, they are about the size of your thumb. Alto means high while cumulus means heap and signifies convection. ...
A middle cloud, usually white or gray. Often occurs in layers or patches with wavy, rounded masses or rolls.
Clouds in the mid-troposphere that are gray or white in color and that occur as layers or patches with vertical development.
A mid-level cloud genus, composed of rolling layers or patches of small heaped liquid-water clouds, each of which generally has a shadowed part.
A middle cloud type that is white and/or gray in color and occurs as a layer or patch with a waved aspect. Generally have shadowed parts.