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Altostratus clouds are named because they are middle height clouds ("alto")
and are spread out, thin, and layered ("stratus"). Sunlight is often visible
through these clouds as in this picture. Altostratus clouds form when a front
of warm, moist air meets a body of cold, dry air. If these clouds thicken, then precipitation is likely.
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Puerto Rico, Gran Canaria 7/11/2004
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