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Note that the possible height of cloud varies with location and airmass, so the highest cloud can occur in the tropics, the lower heights (with cirrus possible at 10,000 ft or 3500 m) in polar regions.
Further classification identifies clouds by height of cloud base. For example, cloud names containing the prefix cirr-, as in cirrus clouds, are located at high levels while cloud names with the prefix alto-, as in altostratus, are found at middle levels. This module introduces several cloud groups. The first three groups are identified based upon their height above the ground.