一次强对流天气的中尺度对流系统和雷达回波特征分析

Analysis on Mesoscale Convective System and Radar Echo Characteristics of a Strong Convective Weather

利用FY-2F卫星TBB资料、多普勒雷达资料及常规气象观测资料等,对2018年3月30日发生在安顺的一次强对流天气进行分析。结果表明,此次过程的中尺度对流系统是由3个对流单体合并生成,其伸展高度较高,发展强盛,生命史在8 h左右,当云顶亮温TBB<-48℃时,有产生强对流天气的可能性;弓形回波预示着雷暴大风的来临,低层存在有界弱回波区、高层有强回波悬垂以及>50 d BZ的强回波伸展到-20℃层高度以上,预示着产生强冰雹的可能性大。

By using the data of FY-2 F satellite TBB,Doppler radar and conventional meteorological observation,a severe convective weather in Anshun on March 30,2018 was analyzed. The results showed that the mesoscale convective system in this process was formed by the combination of three convective monomers,with high extension height,strong development and a life history of about 8 hours. When the cloud top bright temperature(TBB) was less than-48℃,it was possible to generate strong convective weather. Bow echo indicated the coming of thunderstorm and gale. There were bounded weak echo areas in the lower layer,strong echo overhang in the upper layer and strong echo with the reflectivity over 50 dBZ extending above-20℃ in the upper layer,which indicated the possibility of producing strong hail.