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《Journal of Arid Meteorology》 2011-02
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Analysis of Echo Characteristic of a Strong Squall Line Process Based on Dopplor Weather Radar

CHEN Deqiao1,LIU Yingjun2,TANG Minghui2,DING Xiaojian2(1.Hengyang Meteorological Bureau of Hu'nan Province,Hengyang 4210001,China; 2.Meteorological Observatory of Hu'nan Province,Changsha 410007,China)  
Conventional meteorological data and Doppler weather radar products are used to analyze the strong squall line weather process occurred in Hu'nan on March 21,2009.The results show that the weather process occurred in advantageous environment field(the warming and humid at lower atmosphere,the stronger vertical wind shear in middle and low level atmosphere),and the invasion of middle-level cold advection aggravated the unstable stratification. During this process the hail echo characteristics presented V-gap,the weak echo region and overhanging structure,and there was convergence in the internal of the hail cell(below three km).When the VIL was above 40 kg·m-2,hail and strong wind was likely to occurr.Sharp increment of VIL appeared before hail occurrence.
【Fund】: 湖南省气象局重点项目 高分辨率数值预报产品释用技术研究(200602)资助
【CateGory Index】: P458.121
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