太原一次以雷暴大风为主的强对流过程分析

Analysis on a Strong Convective Process Dominated by Thunderstorm and Gale in Taiyuan

利用Micaps格式的高低空观测数据以及常规地面观测资料和自动站实况资料,应用天气学原理,对太原2018年6月9日太原一次强对流天气过程进行分析。研究结果表明,此次雷暴大风形成的主要原因是高空动量下传以及对流风暴中的下沉气流到达地面时产生辐散,造成地面大风。造成此次阳曲小冰雹的主要原因是近地层水汽较充足,午后晴空辐射层结变得更加不稳定,上升运动增强,冷空气较强而产生的。此外,VIL两次跃增,最强达41 kg/m^2,距离降雹有0.5 h左右的提前量,对预报小冰雹有重要指示意义。

Using the high and low altitude observation data in the Micaps format,the conventional ground observation data and the fact data of the automatic station,applying the synoptics principle,this paper analyzes a strong convective weather process in Taiyuan on June 9,2018.The research results show that the main reasons for the formation of the thunderstorm wind are the downflow of momentum from high altitude and the divergence of downdraft in the convective storm when it reaches the ground,causing the ground gale.The main reason for the small hailstorm in Yangqu is that the water vapor in the near strata is more abundant,the radiation stratification in the sunny sky becomes more unstable in the afternoon,the upward movement is enhanced,and the cold air is stronger.In addition,VIL jumped twice,with the strongest up to 41 kg/m^2,and the advance amount of hail falling was about 0.5 h away,which was of great significance in predicting small hail.