Thick, but wispy at the same time. Thick, white and fluffy would make it a Cirrocumulus cloud. So they're thick, but also wispy at the same time, and don't have to be white. They can be, gray, white, or even dark black.
A middle-level cloud located between 6500 and 20,00 feet, altocumulus clouds are either banded or rounded in formation. Sometimes, they look like balls of cotton stuck into the blue background of the...