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用中尺度模式对一次江淮流域暴雨过程进行了数值试验，并研究了对流层高层青藏高压东侧偏北大风的强弱与低层流场及中尺度系统发生及至降水过程的影响。试验不仅较成功地模拟了本次暴雨过程及相应的系统，而且揭示出较强的高空偏北大风将引起对低空急流的加强。而更为重要的是低层切变线的出现以及其上中尺度涡旋的发生。上下风场所构成的垂直反环流圈大大有利于对流的发展，特别是在切变线地区的上升支，带有明显的中尺度特征。
The mesoscale model is used to conduct a numerical experiment on the heavy rainfall process in the Yangtze-Huaihe River Basin. The northerly winds on the east side of the upper Qinghai-Tibet Plateau in the upper troposphere and the effects of low-level flow field, mesoscale system occurrence and precipitation on the precipitation process are also studied. The experiment not only simulated the success of the torrential rain process and the corresponding system, but also revealed that strong strong northerly winds will cause the enhancement of low-level jet stream. More importantly, the emergence of the lower shear line and its occurrence of the upper-middle scale vortex. The vertical anti-circumfluence circle formed by the vertical and horizontal wind fields greatly contributes to the development of convection, especially in the ascending branch of the shear line region, with obvious mesoscale features.