“白鹿”台风(1911)残涡造成广西大范围暴雨成因分析

利用常规气象资料及EC再分析、卫星云图、雷达、中尺度自动站等资料,采用天气动力诊断分析方法,对"白鹿"台风(1911)残涡造成广西大范围暴雨的成因进行分析。结果表明,"白鹿"台风残涡暴雨是在有利的高低空环流形势和强水汽辐合条件共同作用下造成的。有利的环流条件使停编后的"白鹿"残涡强度维持、加强,卫星云图显示"白鹿"南半环云系发展旺盛、密实,雷达回波显示残涡螺旋云带的前端有新生对流发展、传播,从而造成广西大范围暴雨发生。

Analysis of Large-scale Rainstorm in Guangxi Caused by Residual Vortex of typhoon "Bailu"(1911)

Based on the data of conventional meteorology, EC reanalysis, satellite cloud map, radar,mesoscale automatic station, etc., the causes of large-scale rainstorm brought by the residual vortex of typhoon "Bailu"(1911) in Guangxi were analyzed by means of synoptic dynamic diagnosis and analysis. The results show that this residual vortex rainstorm is caused by the coupling of low-and-upper level jets circulation and strong water vapor convergence. The favorable circulation conditions made the residual vortex maintained and even strengthened.The satellite cloud image shows that the southern half ring cloud develops vigorously and densely,and the radar echo indicates that there is new convective development and propagation at the front of the spiral cloud belt of the residual vortex.All these changes led to this large-scale rainstorm in Guangxi.