Cirrus

Clouds of the troposphere

Thin ice-crystal fibres shaped by winds high in the troposphere.

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

Cirrus

Thin ice-crystal fibres shaped by winds high in the troposphere.

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