Rather than assuming that clouds form at 100 % relative humidity, the cloud fraction can be related a critical value of relative humidity less than 100 %, reflecting the sub grid scale variation that occurs in the real world.

Rather than assuming that clouds form at 100 % relative humidity, the cloud fraction can be related to a critical relative humidity of 70 % for stratus-type clouds, and at or above 80 % for cumuliform clouds, reflecting the sub grid scale variation that would occur in the real world.

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