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Skaugen’s method of spatial disaggregation was applied to disaggregate rainfall forecasts using the atmospheric numerical forecasting model WRF —Weather Research and Forecasting, for an area in the Iguaçu river basin, in the state of Paraná, Brazil. This basin is very important because it is used in the Brazilian electrical grid system. The statistical disaggregation method proposes that spatial dependence is maintained by interpolation, and that precipitation is exponentially distributed. It can have two or three parameters according to whether the rain cover in the cells is intermittent or complete, respectively. The results found were satisfactory, and the grid mean and standard deviation were maintained. In addition, the values of the standard error of means were small, indicating stable simulation. The spatial correlation was analyzed, and the disaggregated events maintained the correlation structure of the WRF model forecasts. Key-words: precipitation; spatial disaggregation; exponential distribution; WRF model.

Aplicação do Modelo de Skaugen para Desagregação Espacial da Chuva na Bacia do Rio Iguaçu - Brasil