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Cloud Amount. The proportion of sky obscured by cloud. Usually expressed in tenths of the sky covered. Thus 10/10ths indicates complete overcast. Also expressed in eighths or 'oktas'.
Cloud Base. The height at the bottom of a towering cloud.
Meteorological observations are of wind, air temperature, cloud amount, cloud cover, cloud height (cloud base and cloud top), and special phenomena; and are important data for numerical weather prediction.
 See also: Force, Flight, Pilot, Navigation, Wind
  
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