观测和统计发现，6月中旬常在浙闽赣地区发生强暴雨并造成严重灾害，很有研究需求。分析指出该地区暴雨系统特征常不同于江淮梅雨暴雨系统特征。相对于江淮梅雨暴雨研究，浙闽赣地区暴雨的研究非常有限，其中有很多科学问题值得研究。本项目通过理论分析和数值模拟来定量研究浙闽赣地区暴雨中尺度系统的结构特征及其形成机理。利用暴雨的高分辨模拟个例资料及观测资料来分析造成暴雨的中尺度系统的结构；研究地形和水汽辐合及输送引起的云微物理过程的变化对暴雨的作用；本项目研究为提高浙闽赣地区暴雨预报能力提供科学理论依据。

The statistical analysis of observational data shows that torrential rainfall often occurs over Zhejiang, Fujian and Jiangxi (ZFJ) in the second ten days of June and causes serious damages. Thus, it needs attentions from meteorologists. The analysis also reveals that the characteristics of torrential rainfall in ZFJ are different from those over Jiang-Huai (JH) area. The study of torrential rainfall in ZFJ is very limited compared to that in JH, but there are many scientific questions that require answers. This proposal is to study the structures and formation processes as well as quantitative rainfall associated with the torrential rainfall in ZFJ through theoretical analysis and numerical modeling. The structures of mesoscale systems are investigated using modeling data of torrential rainfall; The torrential rainfall responses to orography and changes in cloud microphysical processes by the convergence and transport of water vapor are examined; The proposed study lays down scientific theoretical foundation for the improvement of torrential rainfall forecast in ZFJ.