The Fraction of Sky Covered by Clouds information dialog allows for the input of the of Fraction of Sky Covered by All Clouds (code N) and Fraction of Sky Covered by CL or CM Clouds (code Nh).
Fraction of Sky Covered by All Clouds

Definition: Fraction of sky covered by all cloud types -

Method of Measurement: Visual observation.

Dialog Operation: Select from the appropriate definition using the mouse or the up/down arrow keys in the list box. This will input a value for code N.

Definition: Nh is the amount if all CL cloud present or, if no CL cloud is present, the amount of all the CM cloud present.

Method of Measurement: Visual Observation

Dialog Operation: Select from the appropriate definition using the mouse or the up/down arrow keys in th e list box. This will input a value for code Nh. If CL clouds are present select fraction of sky covered by them. If CL clouds are not present then select fraction of sky covered by CM Clouds.