一次局地强冰雹的多普勒雷达回波特征分析

摘要

Based on the CINRAD/CC Doppler Radar data at Akesu,a strong hail weather on July 27, 2009 in Wushi County is analyzed.The result shows as follows.(1)The influence of middle and low level shear line and convergence line mainly caused the strong hail weather.(2)There were strong convergence airflow and vertical wind shear in the hail cloud. The radial velocity showed typical meso-scale characteristics such as adverse wind area and convergent region.(3)Strong hail cloud echo could be more than 60 dBz.The VCS section showed typical features of hail cloud such as overhang ech,echo wall,fornix.(4)VIL, VWP products can denote developmental situation of cloud and can be used as discrimination factor of hail potential indicator.%应用阿克苏CINRAD/CC型多普勒雷达产品，对2009年7月27日发生在乌什县的强冰雹天气过程进行分析，得出以下结论：（1）本次强冰雹天气发生、发展的主要机制是受中低层切变线和辐合线的共同影响；（2）雹云内存在较强的气流辐合和垂直风切变，径向速度图上有逆风区、辐合区等中尺度强降水特征出现；（3）强雹云的反射率因子可达60 dBz以上，在VCS剖面中前悬回波、回波墙、穹窿等雹云的特征回波明显；（4）VIL、VWP产品变化能够很好地指示云体发展情况，是判别降雹潜势的指标。