summation principle—The principle states that the cover assigned to a layer is equal to the summation of the sky cover of the lowest layer plus the additional coverage at all successively higher layers up to and including the layer in ...
According to the summation principle, at any level, if the ratio of the transparent sky cover to the total sky cover (opaque plus transparent) is one-half or more, then the cloud layer at that level must be classified as "thin.
SUFSufficientSummation PrincipleThis principle states that the sky cover at any level is equal to the summation of the sky cover of the lowest layer plus the additional sky cover provided at all successively higher layers up to and including ...
 See also: Disturbance, Streamlines, Rain, Mixing, Lightning
  
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