2010年7月22～24日三门峡市暴雨过程特征分析

摘要

The diagnostic analysis for the heavy rain process in Sanmenxia during July 22 -24 in 2010 is carried out using the NCEP/NCAR reanalysis data and conventional observation data. The results show that the heavy rain areas confined in foreside of the vortex on low altitude and the strong wind belt of the south of the shearline, it makes the existence of strong convergence upward motion; there exists strong vortex motion in the west of the heavy rain areas, convergence of low level and divergence of higher level are dynamical condition of storm rainfall; in the radar basic speed products, it could analyze a lot typical mesoscale and small scale synoptic systems, these systems are a direct result of the high-intensity rainfall; the adverse wind area in the speed field (including low speed center) can distinguish rain and heavy rain area very well, rain will occur in the adverse wind area or affected zone around the place.%采用NCEP/NCAR再分析资料和常规观测资料对2010年7月22 ～ 24日三门峡市暴雨过程进行诊断分析.结果表明,此次暴雨过程的暴雨区一直处于中低空低涡前部、切变线的南侧强风速带中,使得一直存在强烈的辐合上升运动；在暴雨区西部存在强烈的涡旋运动,低层辐合、高层辐散的形势为暴雨的发生提供了动力条件；从雷达基本速度产品分析出很多典型的中小尺度天气系统,这些系统直接导致了大强度降水；速度场上的逆风区(包括速度低值中心)能够很好地判别暴雨和暴雨落区,暴雨就发生在逆风区发生地或影响区周围.