2021年5月15日景德镇地区一次强对流过程分析

Analysis of a Strong Convection Weather Process in Jingdezhen Area on May 15,2021

为有针对性地开展雷暴大风的预报服务,利用常规高空、地面观测资料、风廓线产品、江西雷达拼图产品等资料分析了2021年5月21日景德镇地区一次大风、冰雹强天气过程。主要结论如下:1)此次强对流过程强度大,具有一定极端性。雷暴影响前后出现气压涌升、气温骤降等特点。通过相邻2站要素对比发现,极端大风与2站温压差最大时刻吻合。2)此次天气过程出现在西南急流控制下的暖区中,符合低层暖平流强迫类概念模型特征。中低层剧烈增暖加剧了大气不稳定,多个对流指数异常。3)风廓线雷达产品显示,对流风暴影响前存在动量下传、信噪比、Cn^(2)、垂直速度跃增等现象。4)雷达拼图产品特征符合江西雷暴大风、局地冰雹识别指标,存在65 dBz以上回波“核”、强回波梯度等特征。这些为景德镇市雷暴大风的监测、预警提供了参考。

In this paper by using upper air and ground observation data,wind profile products,Jiangxi WebGis radar composer products etc,a strong convection weather process in Jingdezhen on May 15,2021 is analyzed.The conclusions are as follows:1)this strong convection weather process is strong and extreme.Before and after the impact of thunderstorms,there are characteristics such as surge of air pressure and sudden drop of air temperature.By comparing the elements of the two adjacent stations,it is found that the maximum wind coincides with the time when the temperature and pressure difference between the two stations is the largest.2)The weather process occurred in the warm region controlled by the southwest jet,which is in line with the characteristics of the conceptual model of low-level warm advection forcing.Severe warm increasing in the middle and lower layers intensifies atmospheric instability and multiple convective index anomalies.3)The wind profile products like SNR、Cn^(2) and the vertical wind speed all have a sudden increasing during the process.4)The characteristics of the WebGis radar composer product meet the local hail identification index in Jiangxi Province,and there are features such as echo"core"above 65 dbz and strong echo gradient,which can provide support for hail early warning.