威宁一次降雹过程的雷达回波特征分析

Analysis of radar echo characteristics of a hail process in Weining

文章利用威宁新一代天气雷达观测资料,结合常规气象观测资料,对2019-08-13下午出现在威宁的一次冰雹天气过程进行了分析。结果表明,500 hPa上的偏北冷气流与700 hPa上的西南暖湿气流形成的上冷下暖的不稳定结构是发生此次冰雹过程的主要原因;降雹时回波强度、垂直累积液态含水量并未达到最大值,降雹后回波强度、垂直累积液态含水量进一步增强后才逐渐减弱消散;强中心回波强度达60 dBZ和垂直累积液态含水量跃增可作为冰雹发生的重要指标。

Based on the observation data of the new generation weather radar in Weining,combined with the conventional observation data,a hail weather process occurred in Weining on the afternoon of August 13,2019 was analyzed.The results show that the unstable structure with upper cold and lower warm formed by the northward cold airflow over 500 hPa and the southwest warm airflow over 700 hPa,is the main reason for this process.When hail falls,the echo intensity and vertically integrated liquid are not the maximum values.After hail falls,the echo intensity and vertically integrated liquid are further enhanced before gradually weakening and dissipating.The strong central echo intensity of 60 dBZ and the vertically integrated liquid jump can be used as an important indicator of hail.