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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.
Cirrus clouds are a high-level cloud (above 20,000 ft.), and they are made of icy crystals. These wispy, delicate-looking clouds arrive in advance of frontal systems, so they indicate the weather is about to change.