Cirrostratus

Clouds of the troposphere

A translucent ice-cloud veil; its crystals can produce solar and lunar halos.

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Clouds and a rainbow above green mountains, winding rivers and a blue coastline — Googolstars

Cirrostratus

A translucent ice-cloud veil; its crystals can produce solar and lunar halos.

High clouds

5–13 km

High clouds are mostly made of ice crystals. Cirrus forms delicate fibres, cirrocumulus makes small ripples, and cirrostratus spreads into a thin veil that can produce a halo around the Sun.

Cloud classification · WMO Troposphere