When a cloud's name includes "alto," it signifies that it is a mid-level cloud. While "alto" means "high" in Latin, these clouds aren't the highest in the atmosphere. Instead, "alto" is used to differentiate these clouds from low-level clouds like stratus and cumulus. According to the provided reference, although alto means "high" in Latin, altostratus and altocumulus clouds are classified as mid-level clouds. The term distinguishes them from low-level liquid-based clouds, stratus and cumulus.
In summary, an "alto" cloud is a mid-level cloud.
