SYNOPTIC STUDY OF PREDICTIONS OF CLOUDDD COVERAGE AND NORMALIZED CLOUD HEIGHT.
Technical memo no. 3,
TRAVELERS RESEARCH CENTER INC HARTFORD CONN
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Cases in which large errors occurred in the prediction of cloud amount and normalized cloud height were analyzed. The biggest errors occurred with the westward movement of fronts. Other errors occurred when fronts moving west to east passed the predictand point. Local conditions and advection of air over elevated terrain also were reasons for many errors. Parameters that may be helpful in screening runs would be upslope motion, and possibly upper air winds to be used for steering and speed of movement of surface features. Possible prediction points should be located east and south of the point for advection in the eastern U. S. Additional frontal parameters may be included to minimize the errors caused by fronts. Author