What is Clear?
Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility. Clear sky. In meteorology, this term is also used when the cloud cover is less than 1/8 during the day or at the observation hour.
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Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility....
The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.
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