2022年4月25日江西暴雨强对流过程分析

Analysis of Heavy Convection Process of Jiangxi Rainstorm on April 25,2022

利用常规天气图、雨量、大风等气象观测资料、江西WebGIS雷达拼图等平台资料,对2022年4月25日江西中北部大范围的强对流天气过程进行了分析,结果如下:短时强降水、雷暴大风、强雷电、146站次的8级以上大风(极大风速达29.6 m/s)是此次强对流过程主要的天气实况;“上干下湿”、低层辐合线、高空低槽、高层辐散、强盛的低空西南急流、超低空西南急流、地面气旋是此次强对流天气过程的主要影响系统;45~55 dBz带状强回波主要造成短时强降水,强回波带的走向与回波单体的移动方向较为一致,回波强度达55 dBz,并持续,是导致50 mm/h以上的极端强降水的主要回波特征;在环境条件、地理条件优越时,45 dBz以上的带状强回波所经之处,容易导致雷暴大风,而组合STI移动信息对于带状强回波未来1 h的移动趋势有明显指示意义。

By using the conventional weather map,rainfall,gale and other meteorological observation data,Jiangxi WebGIS radar mosaic and other platform data,the severe convective weather process in the central and northern part of Jiangxi on April 25,2022 was analyzed.The results are as follows:short-term strong precipitation,thunderstorm gale,strong lightning,and 146 station times of strong wind above grade 8(extremely strong wind speed of 29.6 m/s)were the main weather conditions of this severe convective process;“Upper dry and lower wet”,low level convergence line,upper level low trough,upper level divergence,strong low level southwest jet,super low level southwest jet,and surface cyclone are the main influence systems of this severe convective weather process;The 45~55 dBz banded strong echo mainly causes short-term heavy precipitation.The trend of the strong echo zone is consistent with the moving direction of the echo monomer.The echo intensity reaches 55 dBz and continues.It is the main echo feature that causes extreme heavy precipitation above 50 mm/h;When the environmental and geographical conditions are superior,the places where the strong band echo of more than 45 dBz passes are likely to lead to thunderstorms and gales,and the combined STI movement information has obvious indication significance for the movement trend of the strong band echo in the next 1h.