Analysis on Doppler Radar Characteristic of a Short-time Severe Convective Weather in the Eastern Part of Qinghai Province

Based on conventional sounding data and Doppler radar information of Xi'ning station in Qinghai Plateau,a short-time strong convective weather process occurred in Haiyan on July 6,2010 was analyzed.The result shows that the short wave trough along the north-west stream in Hami area moving southeastward was the main influencing system,the heavy rainfall supercell accompanied with mesocyclone is the dominating characteristic on radar echoes chart,the first time when the integrated liquid water content increasing explosively and then decreasing immediately was corresponding to the starting of strong rainfall,and the second decrease of VIL was corresponding to hail falling.The course of successive double-layers with no data below 40 kft from destructing gradually to buiding-up completely on wind profile chart was just corresponding to the whole rainfall process.The main character of the rainfall suppercell during this weather process was that the reflectivity factor was more than 50 dBZ,and precipitation echo enwrapped the middle cyclone,as well as the V-shaped notch was behind the bow echo,which were different from other type suppercells.The height of radar echoes more than 50 dBZ ranged from-10 ℃ and-20 ℃ level,which resulted in no large hail falling during this weather progress.