山东西北部2009年非汛期罕见大暴雨过程分析

利用常规观测资料、逐小时自动站资料、FY2-2C卫星资料和MICAPS3提供的最新Physic资料,对2009年5月9～10日山东省西北部的大暴雨过程进行了诊断分析。结果表明,此次大暴雨过程是由高空槽、中低层切变线及西南气流、地面低压共同影响产生的。在大暴雨开始前的1～5d内,从单站要素场上可以看出,热力、动力、能量就开始在鲁西北聚集,形成了强的不稳定形势;当有冷空气扩散南下时,在适宜的动力条件、地面低压、低空急流等条件的触发下,大暴雨天气发生了,它的落区在高空急流轴的右后方和低空急流轴的左前方。从卫星云图上可以清楚地看到,MCS是造成此次大暴雨的直接原因。同时,大暴雨开始和结束的时间与垂直速度、水汽通量散度等物理量有很好的对应关系,为此类强降水的预报提供了有利的参考依据。

Analysis on Process of Rare Non-flood Season Heavy Rainfall in Northwest Shandong in 2009

An analysis on the heavy rainfall in northwest Shandong from 9 to 10 May 2009 was performed with the routine-observational data,hourly data of automated weather station,FY-2Csatellite data and the physic data provided by MICAPS3.The results showed that the heavy rainfall event was caused by joint influences of upper-level troughs,middle-low-level shears,southwest jets and ground cyclone.1-5 days before the heavy rainfall,it is found that the thermal energy,power and energy had accumulated in northwest Shand...