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Altocumulus (from Latin altus 'high' and cumulus 'heaped') [1] is a middle-altitude cloud genus that belongs mainly to the stratocumuliform physical category, 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. [2]
This category is mainly focused on clouds of the cumulus genus and related cumuliform cloud types. Wikimedia Commons has media related to Cumulus clouds . Pages in category "Cumulus"
Altocumulus floccus is a cloud type named for its tuft-like, wooly appearance. [1] The base of the cloud can form as low as 2,000 metres (6,600 ft), or as high as 6,000 metres (20,000 ft). They often form in clusters, or patches, and bases can vary in height with differing atmospheric conditions within the PBL . [ 2 ]
The altocumulus undulatus is a mid-level cloud (about 8,000–20,000 ft or 2,400–6,100 m), usually white or grey with layers or patches containing undulations that resemble "waves" or "ripples" in water.
Altocumulus stratiformis is the most common species of the Altocumulus genus of clouds. [1] They tend to form broad layers of individual, cell-like clumps, often separated from each other, though they sometimes can coagulate into a larger individual cloud. They often have a vertical extent of less than 500 m. [2]
In this phase, water vapor condenses on various nuclei present in the air, forming the cumulus cloud. This creates the characteristic flat-bottomed puffy shape associated with cumulus clouds. [4] [5] The height of the cloud (from its bottom to its top) depends on the temperature profile of the atmosphere and of the presence of any inversions. [6]
Altocumulus volutus is a type of altocumulus cloud. This cloud type has the appearance of a single, small, horizontal, rolling line, it is relatively rare compared with its counterpart stratocumulus volutus, [1] This cloud does not attach to any other cloud. It may or may not appear with altocumulus clouds of different species.
This type of cloud appears as holes present in an altocumulus cloud cover resembling a honeycomb. It is considered to be rare, since it is typically short-lived. [1] Lacunosus cloud types (including this one) forms when a layer of cold air and a layer of warmer air come in contact with each other.