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High Clouds. Mean height of more than 20,000ft. Usually composed of ice crystals. They are:
(a) Cirro-cumulus (mackerel sky). Layer cloud of small white flakes or of small globular masses. Often resembles the ripples in the sand on the seashore.
The bases of high clouds range from 16,500 feet to 45,000 feet and average about 25,000 feet in the temperate regions.
Cirrus and cirrostratus (Cl)(Cs) ...
  
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