SUMMATION LAYER AMOUNT
The amount of sky cover for each layer is given in eighths of sky cover attributable to clouds or obscurations.
SCATTERED The amount of sky cover for a cloud layer between 3/8ths and 4/8ths, based on the summation layer amount for that layer.
OVERCAST The amount of sky cover for a cloud layer that is 8/8ths, based on the summation layer amount for that layer.
 See also: Earth, Surface, Sky cover, Ocean, Layer amount
  
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