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Analysis on a Strong Single Hail Occurred in Yongdeng County of Gansu Province

QU Yong-xing~1,SUN Xu-ying~1,JI Lan-zhi~2,HAN Ling~3(1.Key laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province,Lanzhou Institute of Arid Meteorology,CMA,Lanzhou 730020,China;2.Lanzhou Central Meteorological Observatory,Lanzhou 730020,China;3.Yuzhong County Meteorological Service of Gansu Province,Lanzhou 730100,China)  
According to the synoptic background and the evolution characteristics of radar echoes of a strong single hail event occurred in Yongdeng county of Gansu Province on July 8,2003,the jumping change of echo height,intensity and liquid water content,and the special structure features of the strong single hail were analyzed in this paper.The results show that the range and extension height of strong reflectivity area on vertical section are important to hailstorm development.While the strong reflectivity area is corresponding to abundant water area in cloud,and only water content accumulating area being in the supercooled region in the cloud can be benefit to hail development.Once the echo intensity reached 55 dBz and its height was above 4 km,hail falls immediately.The strong single hail with special structure developed very strongly.Above conclusions are significant to hail monitoring and prewarning.
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