The Cloud Height and Visibility information dialog allows for the input of the of Cloud Height (code h) and Visibility Covered by (code VV).
Cloud Height

Definition: Height above of sea surface of the base of the lowest cloud seen.

Method of Measurement: Visual estimations. First determine the type of the lowest cloud seen, and then refer to it's normal height range. As a rule of thumb, for a given cloud type, heights are higher in the tropics and during the summer months..

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 h.

Definition: Visibility is the greatest distance an object can be seen and identified.

Method of Measurement: Usually a visual estimate. Report prevailing visibility - the maximum visibility common to one half or more of the horizon circle. When visibility is uniform in all directions, prevailing visibility and visibility are the same. When visibility is not uniform in all directions, determine prevailing visibility by dividing the horizon circle into sectors of visibility. Estimate the highest visibility common to one half or more of the horizon circle.

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 VV.