Cloud Cover

The amount of cloud covering the sky, measured in 1/8th.

The unit is the okta a unit of proportion equal to 1/8.

If half the sky is cloud-covered, the coverage is reported to be 4 oktas.

Broken

The amount of sky cover for a cloud layer between 5/8ths and 7/8ths, based on the summation layer amount for that layer.

Overcast

The amount of sky cover for a cloud layer that is 8/8ths, based on the summation layer amount for that layer.

Scattered

The amount of sky cover for a cloud layer between 3/8ths and 4/8ths, based on the summation layer amount for that layer.

Sky Cover

The amount of the celestial dome that is hidden by clouds and/or obscurations.

Summation Layer Amount

The amount of sky cover for each layer is given in eighths of sky cover attributable to clouds or obscurations. The summation amount for any given layer is equal to the sum of the sky cover for the layer being evaluated plus the sky cover for all lower layers, including partial obscuration. A summation amount for a layer can not exceed 8/8ths.


See also: Clouds.

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Subjects: Meteorology