cirrostratus cloud

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Noun1.cirrostratus cloud - a thin uniform layer of hazy cloud at high altitude
cloud - a visible mass of water or ice particles suspended at a considerable altitude
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Sometimes they are so thin that the halo is the only indication that a cirrostratus cloud is in the sky.
local time, a cirrostratus cloud formed and quickly expanded above us.
This beautiful phenomenon is caused by sunlight passing through high Cirrostratus clouds which consist of ice crystals.