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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.
Clouds are made up of tiny droplets or frozen crystals of water. 1  High-High level clouds form above 20,000 feet. 2  Because it is colder higher up, these clouds are mostly made of ice crystals. 3  High level clouds usually have the prefix cirro or cirrus in their name.