The operational numerical weather forecasting model T63 is employed to study the impacts of precipitation on the movement of the anticyclone overthe Western Pacific. Sensitivity experiments are designed by using different vertical profiles ofconvective latent heating. Results show that in response to the change of vertically non-uniform diabatic heating, the in-situ wind fields change correspondingly and thus the location and intensity of the subtropical high are changed. Meanwhile, the changed subtropical high also affects the location of precipitation. It is then concluded that in short and medium terms, there exists interaction between precipitation and variation of the subtropical high.

According to the characteristics of numerical GMS infrared imagery the improved statistic retrievalmethod is applied to estim the temperature and humidity. Several schemes are developed to control the quality of retrieved temperature and humidity in order to correct the errors from the image and the retrieval scheme. The variational assimilation is performed of the corrected retrieval field with the conventional observations followed by a control expenment by the MM4 model. Results show that the quality control is critical to the forecasting based onthe rationaldesigned function. The correction with the grid values is better than that of the conventional observation, and with the systematic error correction to the retrieval field included the accuracy of rainfall forecasting is improved. It is worth notice that the scheme with satellite image included can obviously improve the intensity and region forecasting of model rainfall and the prediction is more close to measured precipitation as compared with that only using the convendonal observations.