桂西2008年前汛期一次典型大范围暴雨天气过程分析

采用常规气象资料和NCEP再分析资料,对桂西2008年5月29~30日一次大范围暴雨天气过程进行分析。结果发现,活跃的西南季风给桂西上空输送水汽和不稳定能量,是此次暴雨发生的突出特点;南支槽的东移、850hpa切变线南压、地面冷空气南下是暴雨产生的直接影响系统;水汽通量散度表示的水汽辐合区与暴雨中心较为对应,散度场、垂直速度场的相互配置,使暴雨系统加强,K指数、SI指数对暴雨发生有一定指示意义。

ANALYSIS OF A TYPICAL LARGE-SCALE HEAVY RAINFALL IN 2008 OF WESTERN GUANGXI IN THE FLOOD SEASON

By using routine meteorological data and reanalysis of NCEP,the large-scale heavy rainfall of western Guangxi in May 29 to 30,2008 was analysed.The results showed that,the active southwest monsoon over the western Guangxi transporting aqueous vapor and instability energy was the outstanding feature of the rainstorm;eastward shifted of the South Branch trough,south pressured of the 850hpa shear line and southwarded of the cold air were the direct impact Systems of the heavy rain;water-vapor flux divergence s...