Cumulus clouds against a blue sky

Cumulus clouds against a blue sky

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Credit: JOHN MEAD/SCIENCE PHOTO LIBRARY

Caption: Cumulus clouds against a blue sky. These cumulus humilis clouds have flat bases and small, rounded tops. Cumulus clouds typically occur under 2000 metres altitude. They form from water vapour in rising columns of air which condenses as it cools. Cumulus clouds often form at cold fronts where the advancing, cool air forces warm air upwards. The humilis variety occurs either as the first stage of the formation of other cumulus types, or when heat transfer (convection) in the atmosphere is weak. Due to its shallow depth, cumulus humilis does not produce any significant weather. This cloud type occurs over most areas of the world.

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Keywords: climate, cloud, cloud types, clouds, cumulus, cumulus cloud, cumulus humilis cloud, fair weather cloud, meteorology, type, weather

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