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利用非静力平衡的中尺度模式（ＭＭ５）对１９９４年５月初华南地区的暴雨过程进行模拟和分析，结果表明：（１）ＭＭ５相当准确地模拟出此次暴雨过程以及有关的中尺度系统的发生发展过程。（２）在弱的天气尺度背景条件下，边界层的中尺度辐合对暴雨的产生起了触发作用。暴雨强度一般随对流层上下部的辐散差值的增大而增大，最大的降水强度对最大的辐散差值的滞后时间不超过一小时。（３）降水的潜热加热作用对此次暖区暴雨的发展和维持有决定性的作用。凝结加热引起的次级环流使暴雨区附近的中尺度急流和切变线扰动得到发展和维持，从而使辐合上升和降水得以进一步加强，它们之间的相互作用过程与ＣＩＳＫ机制相似。
The non-hydrostatic mesoscale model (MM5) was used to simulate and analyze the torrential rains in South China in early May 1994. The results show that: (1) MM5 simulates quite accurately the torrential rain process and the related mesoscale systems The development process took place. (2) Under weak weather scale background conditions, the mesoscale convergence of the boundary layer has triggered the occurrence of heavy rain. Rainstorm intensity generally increases with the divergence difference between the upper and lower troposphere, and the maximum precipitation intensity lags behind the maximum divergence divergence by no more than one hour. (3) The latent heat of precipitation has a decisive effect on the development and maintenance of heavy rainfall in the warm area. The secondary circulation caused by the condensation heat develops and maintains the mesoscale rapids and shear lines in the vicinity of the rainstorm zone. As a result, the convergence and precipitation are further strengthened, and the interaction between them is similar to the CISK mechanism.