山东省2009年7月8～9日区域性暴雨成因分析

Analysis of the Regional Torrential Rain on Jul. 8^(th) to 9^(th) in 2009 in Shandong Province

利用常规天气图、卫星云图、区域自动气象站、新一代天气雷达等资料对2009年7月8～9日发生在山东省区域性强降水过程进行了综合分析。结果表明,山东省处于低层大气涡度的强辐合区和垂直速度上升区,西北涡东移过程中切变线生成,地面倒槽向山东伸展,为暴雨的形成提供了动力条件;高低空急流的耦合加强了对流的发展;低空急流是主要的水汽输送通道,为暴雨产生提供了水汽条件。水汽主要来自南海和孟加拉湾。

The regional torrential rain process on Jul.8th to 9th in 2009 in Shandong Province was analyzed comprehensively by using conventional weather chart,satellite image,data observed by regional automatic weather station,CINRAD data etc.The results showed：vorticity in the lower atmosphere in our province a strong convergence zone and the vertical velocity increased by district,northwest vortex eastward during the shear line was generated,ground inverted trough extended to Shandong,providing the impetus for the formation of storm conditions;jetstream coupling enhanced the development of convection;low-level jet was the main water vapor transport channel,which could provide a water vapor for torrential rain formation.The water was mainly from the South China Sea and The Bay of Bengal.