一次山东大暴雨天气过程分析

Analysis on A Heavy Rainfall of Shandong

2003年4月17～18日山东出现了一次大暴雨天气过程。这次大暴雨天气过程是在西南涡的影响下产生于地面倒槽之中。笔者分析了产生这次大暴雨的环流形势和物理量。结果表明,降雨前水汽量急剧增加,700 hPa最大上升速度区与850 hPa最大水汽通量的叠加区域是大暴雨的落区,高能舌为大暴雨提供了必要的不稳定能量。暴雨发生前低层能量有不断积累的过程。

A heavy rainfall occurred during April 17 and 18,2003 in Shandong Province.The process resulted from an inverse trough affected by southwest eddy.In this paper,the circulation causing the heavy rainfall and physical process were analyzed.The results showed that the moisture transports had sharply increased before the heavy rainfall,and the heavy rainfall had predicted areas in the overlapping areas between maximum updraft in 700 hPa and maximum moisture transports in 850 hPa,and the large energy areas had offered the unstable energy for heavy rainfall.Before the occurrence of heavy rainfall,there was a process of constant accumulation for lower energy.