2008年8月1日吉林省暴雨天气分析

Analysis of Rainstorm Event over Jilin Province during August 1^(st) of 2008

应用常规观测资料、自动站及加密站资料、T213数值预报产品、卫星云图和雷达回波,对2008年8月1日吉林省大范围暴雨天气的成因进行了分析,分析了产生暴雨的天气系统特征,大气垂直稳定度和对流有效位能,产生暴雨的水汽条件和动力触发机制,给出了产生暴雨的卫星云图演变特征。研究结果表明,此次暴雨天气是受"凤凰"台风登陆减弱,其水汽北上与西风槽、副热带高压边缘西南暖湿气流和冷空气的共同影响产生的。低层强盛的西南气流建立起水汽通道,把水汽源源不断地向暴雨区输送。

By using routine observational data,automatic station and data encryption station,T213 model products and diagnosis analysis means,satellite cloud image,radar echo,the rainstorm event over Jilin Province on August 1st of 2008 was analyzed.The weather system,vertical stability of atmosphere,convective available energy,water vapor condition and dynamically triggering mechanism were discussed.The result showed the rainstorm was caused by ＂the phoenix＂ the typhoon debarkation weakens its water vapor to go north,westerly trough,the southwest warm and wet airflow on the edge of subtropical high over the west Pacific and the cold air from the north.The strong southwest airflow set up the water vapor channels where the water vapor can flow to Jilin Province.