闽中—次突发性局部大暴雨的中尺度分析

利用NCEP1°×1°再分析资料、常规观测资料、加密自动气象站以及多普勒雷达资料，对2009年6月3日～4日出现在福建中部沿海地区的局部大暴雨进行了中尺度分析。结果表明：暴雨是在比较有利的天气背景条件下产生的，高空槽、低涡切变线以及地面中尺度切变线是其主要影响系统；对流层中低层大量的水汽输送和对流有效位能的积累为大暴雨的形成提供了有利的环境条件，低层弱冷空气入侵使西南暖湿气流被迫抬升、地面中尺度切变线的形成是暴雨发生的触发机制。

Mesoseale Analysis of a Sudden Heavy Rain in Central Part of Fujian

The NCEP 1°×1° reanalysis data,routine-observational data,the intensive obvervatons of automatic weather station data as well as conventional Doppler radar data are used in the mesoscale ananlysis for the process of a heavy rainstorm on 3-4june 2009 in central part of fujian.The result shows that：the heavy rainfall occurred under the favorable environmental conditions.The affecting systems are the trough on 500hpa,the shear line on 700hpa and 850hpa and ground mesosacale shear line.the existence from strong convergence of water vapor and conditional convective instability in the middle and low troposphere probably provided the suitable environment for heavy rainfall.which is probably triggered by the lifting of warm and humid airflow forced by the intrusion of weak cold air from low-level and the formation of ground mesoscale sheal line.