A regional heavy rain process o<(urged in Cansu province on 19 August in 2004 was analyzed from the weather and Climatic
background Circulation Characteristics as well as the(hange of different physical quantities and the evolution of the Cloud Cluster  at
the same time it was simulated by MM5.  Results show that the favorable weather(ondition and the(onvergenc;e of the low一level wind
are the main reasons of this heavy rain the moving of the heavy rain zone lagged the strong(onvec;tive(loud band on FY一2C hourly
satellite images. The simulated result indicates that MMS is available for forecasting the intensity and location of the rainfall partic;ular-
1y for 12一48 hours rainfall forec;asting} it has some signific;anc;e for forecasting strong rainfall events