Elevated clouds (altitude superior at 20 000 fts)

Cirrus
Cirrus		 Cirrocumulus
Cirrocumulus		 Cirrostratus
Cirrostratus

Cirrus (Ci): In the form of filaments, they generally move in layers. They are thin and they never hide the sun.

Cirrocumulus (Cc): They are thin and composed of very small elements but they are unstable clouds.

Cirrostratus (Cs): They are stable clouds. They are uniform cloudy veils and are often transparent and whitish. They frequently create a phenomenon of a halo around the sun.


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