安顺市“5？11”强对流天气雷达产品特征分析
Analysis of Product Characteristics of “5?11” Severe Convection Weather Radar in Anshun City

利用常规资料、多普勒雷达资料和地面观测资料等，对2021年5月11日贵州省安顺市的一次强对流天气过程中两个强风暴单体的形势背景、强对流发生条件、强风暴单体演变及结构特征、风暴的异同点进行了详细分析。结果表明：上干下湿的不稳定层结，配合高空槽、低空切变线、中低空急流和午后的热低压发展等有利的环流背景，地面辐合线触发强对流天气导致此次安顺冰雹、大风及短时强降水天气的出现；两个超级单体降雹前均出现了回波强度强、有界弱回波区、三体散射长钉和旁瓣回波等特征；贵阳雷达观测到的回波强度和VIL值更大，增加和降低趋势更加明显。这些均为安顺强对流天气的预警、预报提供了参考。
By using conventional data, Doppler radar data and ground observation data, the background, con-ditions of convective occurrence, evolution and structural characteristics of two strong storm cells during a strong convective weather in Anshun City, Guizhou Province on May 11, 2021 are analyzed in detail. The results show that the unstable stratification of dry above and wet below, combined with the favorable circulation background such as upper trough, low level shear line, middle and low level jet stream and the development of hot low in the afternoon, the surface convergence line triggered the strong convective weather, resulting in the occurrence of hail, strong wind and short-term heavy precipitation in Anshun. The characteristics of strong echo intensity, bounded weak echo region, three-body scattering spike and sidelobe echo appeared in both supercells before hail fall. The echo intensity and VIL values observed by the radar in Guiyang are larger, and the trend of increase and decrease is more obvious. All these provide reference for Anshun strong convective weather warning and forecast.