“98·7”北京大暴雨的中尺度分析

对“９８７”北京大暴雨过程中的雨团、雷达回波、地面风场（流场）及气压场进行了分析。分析结果表明：大暴雨过程具有明显的中尺度特征，偏东风的中尺度切变线，风速辐合线和中尺度低压系统在大暴雨过程中发挥了重要作用

Mesoscale Analysis on Torrential Rain over Beijing Area in July,1998

The rain cluster,the radar echo,surface wind field (streamline field) and pressure field during torrential rain over Beijing area in July,1998 were analysed.The results show that there is an obvious mesoscale characteristic for torrential rain process.The mesoscale easterly shear line,the convergence line of wind velocity and the mesoscale depression system all played important role during the torrential rain events.