暴雨过程的中尺度分析

Mesoscale Analysis of the Heavy Rain Process

利用１９９８ 年６ 月１３ 日００ 时～１４ 日１４ 时逐时降水量、地面风场、高空及雷达回波资料，初步分析了中尺度过程的演变特征，指出中尺度系统是造成暴雨的直接原因并统计出物理量、中低压环流活动与暴雨的对应关系。在大尺度环流形势下，中尺度辐合线和地形作用为局地大暴雨提供了有利条件。

Using the hourly precipitation data,surface wind filed,upper air data and radar echo data in Hunan province from 13 to 14 June in 1998, the evolution character of the mesoscale proess was analysed preliminarily.The mesoscale system——direct cause of the heavy rain and the corresponding connection for heavy rain with physical quantity,active of mesolow circulation were pointed out.The large scale circulation situation, mesoscale convergence line and orographic action provided advantage condition for local large heavy rain.