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Observational Investigation of Characteristics of Severe Convective Hook Echo in Pingliang Region

Zhang Hongfa, Gong Naihu, Jia Wei, Wang Zhijun ( Lanzhou Institute of Plateau Atmospheric Physics, Chinese Academy of Sciences, Lanzhou 730000) Zhang Huanlu (Meteorological Bureau of Gansu Province, Lanzhou 730000)  
In general, the cloud intensity and cloud height from radar echo can be used to discern the hailstorm echo. During the experiment of antihail in Pingliang region for the last ten years, it is observed that there are some other characteristics of the severe convective hook echo. in the process of development of the hail, most of hailstorms show cyclonic echo shape, some of which evolve gradually the obvious hook echo and a few stronger of which have the feature of change from an anticyclone hook into cyclone hook. And in the stage of the stability of the hook, the radar reflectivity factor Z e becomes maximum and then begins to decrease. In this process, the cloud height of hook echoes sometimes may increase by 1~3 km, soon after that hailcloud is dispersive, and fallen hails may be observed on the ground. Furthermore, some statistic analyses on these observations are made in this paper.
【Fund】: 中国科学院兰州分院择优基金
【CateGory Index】: P412.15
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