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中文摘要：
采用非静力MM5（3．5）中尺度数值模式对2006年7月14—15日湘南-粤北0604（BIHS）台风暴雨天气过程进行了数值模拟与诊断分析，结果发现暴雨区始终位于不稳定能量高值区域，并存在对流不稳定及条件性对称不稳定两种机制。强降雨中心附近非地转湿Q＊散度是正、负相间分布，暴雨中心在低层对应非地转湿Q＊散度负值中心，在高层对应正值中心，并位于次级环流低层上升支一侧。次级环主要是由风的水平切变和垂直切变差异效应造成的，其次是非绝热加热作用，且与暴雨的发展相一致。
英文摘要：
By using the PSU/NCAR model MM5,the rainstorm process occurred in the south of Hunan Province and north of Guangdong caused by typhoon No. 200604 （Bilis） is numerically simulated. The fine resolution results of model output is used to diagnostically analyze some physical variables. The results show that the rainfall locates in the center of high instability area, and is coincident with two kinds of instability mechanism-convection and CSI. The ageostrophic wet Q-vector divergence near the rainfall center distributes in a manner that is alternatively positive and negative. The center of rainfall locates near ascending Q-vector divergence. Secondary circulation is dominately due to the difference between vertical and horizontal shear. Diabatic process forcing is also attributed to secondary circulation.
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