低空急流对2015年5月6日暴雨过程的影响分析

An analysis of the influence of low level jet on the rainstorm in May 6, 2015

使用了MICAPS、卫星云图等常规资料及NCEP再分析资料，分析5月6日暴雨过程，这次过程具有持续性强，强度大，局地性明显等特征，环流形势上，中层有高空槽过境，低层西南涡东移、切变线南压，地面冷空气渗透，非常有利于降水，同时由于夜间冷空气南下抑制低空急流发展，但后半夜急流再度发展，导致切变线在南部沿海一带徘徊对峙，形成了持续时间长的强降水。

Using MICAPS, satellite images, and NCEP reanalysis data, the rainstorm process in May 6th was analyzed in this paper. This process has strong continuity, high strength, and obvious local characteristics. From the aspect of circulation situation, the middle layer had high-level trough;at the low level, south- west vortex was moving eastward, shear line was moving southward and surface cold airinfiltrated, whichwas benefit to precipitation.At the same time, as the cold air at nightmoved to south that suppressed the development of low-level jet, but after midnight,the jet developed again that led to the shear line in the southern coastal area confronting each other and formed a strong rainfall that had a long duration.