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Investigation was conducted on a heavy rain influenced by the typhoon inverted trough of the tropical cyclone "Mekkhala"(2002),which landed the southwestern Guangxi Province. The relevant changes of physical variable fields and wind profile and the fluctuation of surface wind fields are analyzed. The environmental conditions for the strong convection that caused local heavy rainfall around the area where the typhoon inverted trough and the westerly trough joined are discussed in detailed.