一次西南涡东移引起的长江上游流域强降水过程分析

利用MICAPS常规观测资料、FY2E卫星云图资料、fnl 1°×1°资料和三峡梯级调度自动化降水资料对2016年6月30日长江上游流域的暴雨过程进行分析。结果表明:在有利的大尺度环流背景配合下，产生此次强降水过程的主要影响系统是西南涡和低空急流，副热带高压和大陆高压的稳定维持使得西南涡移动缓慢，低空急流的加强使得西南涡加强，从而造成大范围的暴雨；本次过程地面没有冷空气触发，是一次在西南低空急流中出现的暖区强降水过程；高空分流区增强了高层辐散抽吸作用，使得西南涡不断发展加强。 

Analysis of a Heavy Precipitation in the Upper Reaches of the Yangtze River Aroused by Southwest Vortex Moving Easterly

Based on conventional observation data, FY2E satellite data, fnl 1°×1°reanalysis data and Three Gorges Cascade Dispatch & Communication Center rainfall data, a heavy rain event in the upper reaches of the Yangtze River on 30 June 2016 is analyzed. The results indicate that: under the favorable large scale circulation background, the main impact system of the strong precipitation process are the southwest vortex and low level jet, the maintenance of the subtropical high and the continent high makes the southwest vortex moving slowly, the strengthening of the low-level jet caused the southwest vortex to strengthen, resulting in a wide range of heavy rain; There is no cold air trigger on the ground in this process, it's a strong precipitation process in the warm region in the southwest low-level jet; The upper level divergence zone enhances the upper suction effect, which make the southwest vortex continue to develop.