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.
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