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本文通过计算和对比分析，得到１９９１年春、夏江淮地区特大暴雨形成的五个基本特征：西北太平洋上副高显著偏西、偏北；较弱的西南季风与东南气流汇合成强西南气流伸向江淮地区；偏东风与强西南风形成的辐合带在江淮地区维持；江淮地区对流层中下部为强上升运动、上部为辐散；１３０°Ｅ附近南半球向北半球的较强越赤道气流持续。
Through calculation and comparative analysis, we get five basic features of the formation of the torrential rain in the spring of 1991 and in the summer and the Yangtze-Huaihe River area: the subtropical high over the western North Pacific is significantly westward and northward; the weak southwest monsoon converges with the southeastern airstream to a strong southwest airstream The convergence zone formed by the easterlies and the strong southwesterlies is maintained in the Jianghuai region. The mid-lower troposphere in the JAC region is strongly ascending and the upper part is divergent. The stronger CEF flows in the southern hemisphere near 130 ° E to the northern hemisphere.