2018年9月21日本溪地区一次冰雹天气特征分析

Analysis on Hail Weather Characteristics in Benxi Area on September 21,2018

利用本溪市高空、地面等常规气象观测资料对2018年9月21日发生在本溪市高新区的冰雹天气过程的气象要素变化特征进行分析,结合物理量场、加密自动站等资料对冰雹形成机理进行了诊断分析。结果表明,高空冷涡系统,地面冷锋过境,以及高空槽前倾和从高空到地面深厚的垂直系统的配置是造成本溪高新区此次冰雹天气发生的有利条件。冰雹发生前本溪北部对流有效位能积聚超过800J/kg;0℃层高度在上升运动区,利于过冷水滴的形成;相对湿度的空间分布上满足上干下湿的配置,利于对流的发生;明显的垂直风切变也促进了强对流的暴发。

Based on the conventional meteorological observation data such as high altitude and ground in Benxi City,the variation characteristics of meteorological elements during the hail weather process in the high-tech zone of Benxi City on September 21,2018 were analyzed,and the hail formation mechanism was diagnosed and analyzed with the data of physical quantity field and encryption automatic station.The results showed that the collocation of the high-altitude cold eddy system,the transit of the ground cold front,the forward inclination of the high-altitude trough and the vertical system from the high altitude to the deep ground were the favorable conditions for the occurrence of the hail weather in Benxi High-tech Zone.Convective available potential energy accumulation exceeded 800 J/kg before the hail occurred.The height of 0℃layer was in the ascending motion zone,which was beneficial to the formation of supercooled water droplets.