上海98.7.23大暴雨环境场及多普勒雷达资料的分析

应用天气图，卫星云图，探空资料，并重点应用多为勒雷达资料综合分析了１９９８年７月２３日上海大暴雨过程，指出在有利的大尺度环境条件下ＭＣＣ下风方诱生出ＭＣＳ，导致上海产生大暴雨，多普勒雷达基本反射率，径向风场及垂直风廓线资料在暴雨发生前数小时就监测到中尺度切变，中尺度涡旋等触发机制的发生，发展，它们与强降水回波的发展，加强，移动和合并息息相关。

Analysis of Environment Field and Doppler Radar Data for a Heavy Rain Gust on 23,July 1998

By use of synoptic map,cloud image,sounding data and Doppler radar data,the heavy rain gust case which occurred in the 23th of July,1998 is analyzed.It suggests that MCS can be developed on the downwind of MCC under positive large scale environment,which results in heavy rain gust of Shanghai.Furthermore,according to the Doppler radar base reflectivity,radial velocity and VAD Wind Profile (VWP) data closely related to the developing,strengthening,moving and merging of heavy rain gust echo,the forming and developing of trigger mechanism such as meso scale shear or meso scale eddy was detected several hours ago.