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Altocumulus may appear as parallel bands or rounded masses. Typically a portion of an altocumulus cloud is shaded,
a characteristic which makes them distinguishable from the high-level cirrocumulus. Altocumulus clouds usually form
by convection in an unstable layer aloft, which may result from the gradual lifting of air in advance of a cold front.
The presence of altocumulus clouds on a warm and humid summer morning is commonly followed by thunderstorms later in
the day.
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Puerto Rico, Gran Canaria 19/06/2004
Puerto Rico, Gran Canaria 09/06/2004
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