Cirrostratus (Cs)

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Cirrostratus Latin:(Curl Layer) A high ice cloud that takes the form of a sheet through which the Sun or Moon maybe visible. it is created by the slow upward movement of air and condensation or sublimation high in the troposphere. It is often an early indication of rain well ahead of weather fronts. Appearing as a thin veil or fibrous (lined) cloud over the whole sky.

Cs with contrails below