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The nowcasting methods and techniques for largearea rainfall, such as Meiyufront heavy rainfall, are studied on the basis of CHINA/SA radar data. The techniques of multiscale filtering, segmentation, and radar echo matching are discussed according to the characteristics of heavy rainfall echoes. By using the life time of a certain scale echo to restrict the lead time, a forecast can be made for the rainfall at this scale, and total rainfall is obtained through composing. The results show that the accuracy of rainfall forecasting is improved, to some extent, while considering the differences in life time between the echoes of different scales and the moving characteristics.