利用NCEP的1°×1°再分析资料、FY2E卫星云图TBB资料、雷达资料、常规天气资料以及加密自动雨量站资料,对2010年5月13日湖南省湘中地区一次大暴雨天气过程的环流背景、物理量场、卫星雷达资料等进行了天气学诊断分析.结果表明:高空南支槽和中低层切变是这次大暴雨天气过程的主要影响系统,西南低空急流为大暴雨的产生提供了充沛的水汽条件；低层强辐合,高层强辐散的配置,使垂直上升运动得到了发展和加强,低层水汽迅速向上输送,同时引起热量、动量的垂直输送,为大暴雨的形成提供有利的动力和热力条件.%By using the 1° × 1° reanalysis data of NCEP, FY2E satellite data, radar data, conventional observation data and encrypted data of automatic rainfall stations, the circulation background and the physical quantity field of an extreme rainstorm in central of Hu' nan on May 13 of 2010 were analyzed. Results show that the upper south branch trough and low - level shear were the major influence systems of this heavy rainfall, and the southwest low level jet provided plenty of moisture condition for this weather process. Low level . strong convergence and upper level strong divergence were conducive to high - level played "suction effect" , so the vertical upward movement developed and strengthened, and water vapor at low level was transported upward rapidly, at the same time, the vertical transportation of heat and momentum occurred, these all provided a favorable dynamic and thermodynamic conditions for the heavy rain formation.
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