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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.
Very thin cloud composed of water ice. These clouds are the highest clouds in the atmosphere, located in the mesosphere at an altitude of approximately 280,000ft. They are only visible when illuminated by light from below after the sun has gone below the horizon.