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<br />- " <br />., <br />II <br /> <br />I <br />I <br />I <br />,I <br />I <br />I. <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />t <br />I <br />"I <br />I <br /> <br />-. <br /> <br />i i <br /> <br />ABSTRACT <br /> <br />A weather modification program named "AL GHAIT" started operations <br />in November 1984. Like any other weather modification program, for <br />greater operational efficiency and improved evaluation, Al Ghait <br />requires a real-time forecast of precipitation over the target area. <br />For this reason, it was decided to adapt the Rhea Model, a two-dimen- <br />siional, steady-state, multi-layer model which was developed in the <br />1970's by J. Owen Rhea to diagnose the effects of topography on winter/ <br />spring precipitation in western Colorado. <br /> <br />In this thesis, we will describe the steps that led to the adapta- <br />tion of this model to the Moroccan Atlas Mountains, starting with the <br />modifications in the computer programs, the data processing, parameter <br />ccllibrations and sensitivity testing, and comparisons of the adapted <br />model output to the observed data. These comparisons yielded linear <br />cClrrelation coefficients ranging between 0.7 and 0.9 for monthly preci- <br />pitation for most of the stations for which historical observations are <br />available, and give hope that the model will be useful in evaluation and <br />operations on the project. <br />