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本文主要是利用水汽图像和ＨＬＡＦＳ数值模式计算方法从定性到定量地研究１９９８年６月１２日～１４日江南北部的一次大暴雨过程。通过云系路径的分析和发展的定量研究，我们可清楚看到影响江南北部这次大暴雨过程的天气系统，是从青藏高原东移的。其中，特别是该系统（气旋）东移到暖湿的海面时得到了大量暖海表面水汽蒸发补充，水汽上升凝结潜热释放，促使气旋迅速发展。
In this paper, a large-scale rainstorm process in the northern part of Jiangnan from June 12 to June 14, 1998, is qualitatively and quantitatively studied by means of water vapor images and the numerical calculation method of HLAFS. Through the quantitative analysis of the analysis and development of the cloud-based path, we can clearly see that the weather system affecting the heavy rainfall process in the northern part of the southern part of the Yangtze is moving eastward from the Qinghai-Tibetan Plateau. Among them, especially when the system (cyclone) moves eastward to the warm and wet sea surface, a great deal of evaporation from the surface of the warm sea is obtained, which increases the release of latent heat of condensation and prompts the rapid development of the cyclone.