High level, uniform layer of thin white cloud.

Layer of cirrostratus seen from above at 34,000ft. In the distance a Cumulonimbus (Cb) cloud can be seen pushing up through the Tropopause. Photo by Captain Murray O'Shea


Viewed from below the cloud, the sun and moon may be seen to have a bright halo with a red tinge to the edges.

Because of the high altitude, and therefore low temperature, cirrostratus clouds are composed of ice crystals rather than water particles.

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