A PHYSICAL MODEL FOR THE PREDICTION OF LARGE-SCALE LOW CLOUDINESS
Technical rept. for May-Dec 1964
UNITED TECHNOLOGIES CORP HARTFORD CT
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This paper is a report on a continuing effort to develop a physical- numerical model suitable for use in predicting large-scale fields of low cloudiness. Included are a derivation of a basic prediction model and the results of a test series of 12-hr forecasts made with various versions of the model using synoptic data for the period 12Z, 6 Feb.--00Z, 7 Feb. 1964. The tests were designed to assess the characteristics of the model and to indicate areas in which more study is required. The model tested differs broadly from previous boundary layer models in its use of all three space dimensions, a horizontal space mesh of 150 km, and a time step of 15 min. The model incorporates the computation of eddy fluxes of heat and vapor, the transport of heat, vapor, etc. by ageostrophic horizontal winds, the influence of terrain- and frictioninduced vertical motion, and the heat and mass exchanges involved in water-substance phase changes.