cloud cover(redirected from Oktas)
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cloud cover[′klau̇d ‚kəv·ər]
That portion of the sky cover which is attributed to clouds, usually measured in tenths of sky covered. Also known as cloudage; cloudiness.
Estimated as the apparent coverage of the total sky as seen by an observer. It is expressed as octas or decas. When half the sky is covered with clouds, it is referred to as four-octa or five-deca clouds. Generally, the cloud amount is indicated by the expressions few, scattered, and overcast. Also called cloud amount