新疆昌吉州一次极端暴雨天气过程分析及数值模拟

Xinjiang Changji once Extreme Storm Weather Process Analysis and Numerical Simulation in June 9,2016

利用国家气象信息中心和新疆昌吉州的降水资料、FNL再分析资料、卫星资料以及多普勒雷达资料,并使用WRF模式,针对2015年6月9-10日新疆昌吉州地区一次大暴雨过程进行了天气动力学诊断和中尺度分析。结果表明:(1)伊朗高压向北伸展和西太平洋副高西移北伸是有利于暴雨产生的天气尺度系统配置;对流层低层中尺度低压和水汽辐合等中尺度天气系统与大暴雨的形成和分布关系密切。(2)暴雨中心区双湾村地形独特,有利于水汽辐合抬升,配合有弱冷空气翻越天山,激发重力内波,对造成暴雨的强对流天气起到了关键作用。(3)暴雨发生在云顶亮温小于-50℃的冷云西部,在雷法回波图像上有"V"型缺口且稳定少动,是产生短时暴雨的关键原因。(4)地形是决定暴雨强度和落区的重要条件。

The precipitation data from National Meteorological Information Center and the Changji,FNL reanalysis data,satellite data and Doppler radar data,a major rainstorm weather process occurring on 9 to 10 June 2015 in the Xinjiang Changji was comparatively analyzed by dynamics diagnosis and mesoscale analysis.The results showed that：（1） Iran high-voltage northwards and West Pacific subtropical high westward movement of the north extension is beneficial synoptic scale rainstorm configuration;the lower troposphere mesoscale low pressure and moisture convergence and other mesoscale weather systems and heavy rain formation and distribution close.（2）The terrain of storm center in Shuangwancun is unique,which is conducive to lifting of water vapor convergence,with weak and cold air crossing the Tianshan Mountains,and stimulate gravity waves,causing heavy rain and strong convective weather played a key role.（3） Heavy rainfall occurred in cold cloud in the west,TBB of cold cloud was less than-50 ℃,while the thunder echo images have a ＆quot;V＆quot; notch less dynamic and stable,and it is the key cause of short-term heavy rain.（4）The terrain are important factors to determine the intense fall intensity and area.