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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A type of cloud consisting mostly of small particles such as ice particles.
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The jet stream forming the boundary between tropical air and sub-tropical air, characterized by isothermal compression and...