What is Alto?
A prefix used in cloud nomenclature to describe middle-altitude clouds that form between 6,500 and 20,000 feet, such as altostratus and altocumulus. These clouds are often associated with changing weather patterns.
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The state of the atmosphere when it contains the maximum amount of water vapor possible at a given temperature and pressure.
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The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.