Type: High-level cloud
Height of cloud base: 17,000-35,000 ft
Cloud colour: Composed of ice crystals, therefore white.
Cloud shape: A transparent veil of fibrous or smooth appearance totally or partly covering the sky.
Other cloud features: Thin enough to allow the sun to cast shadows on the ground unless it is low in the sky. Produces halo phenomena, the most frequent being the small (22°) halo around the sun or moon - a little more than the distance between the top of the thumb and the little finger spread wide apart at arm's length.
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