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Altocumulus Clouds

Altocumulus Clouds

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. Like other cumulus clouds, altocumulus signifies convection. It is usually white or gray, and often occurs in sheets or patches with wavy, rounded masses or rolls. Altocumulus often are seen preceding a cold front, and their presence on a warm, humid, summer morning frequently signals the development of thunderstorms later in the day. Alto means high and these clouds may cause rain if they are higher up.

Read more about Altocumulus Clouds here: http://en.wikipedia.org/wiki/Altocumulus_cloud