强台风'彩虹'衍生的龙卷风特征分析

摘要

利用局地分析与预报系统(Local Analysis and Prediction System,LAPS)的分析资料和多普勒雷达资料,对1522号强台风"彩虹"外围衍生的广州市番禺区龙卷风的特征进行分析.结果表明:广州市番禺区强台风"彩虹"衍生的龙卷风为F2级强龙卷风,发生在台风移动方向右前侧约390.0 km位置,龙卷风位于强盛的偏南气流和东南气流辐合区,不稳定能量充足,垂直风切变较强,并有冷空气从低层渗透.雷达强度回波图上有明显的弓状结构,径向速度图上探测低层存在中等强度中气旋,但没有明显的钩状回波和悬垂特征,较难界定其为超级单体龙卷风还是非超级单体龙卷风.%The characteristics of a tornado developed from outside of the super-typhoon "Mujigae" (No.1522),which happened in Panyu district of Guangzhou,were analyzed using the analysis data from the LAPS (Local Analysis and Prediction System) and Doppler radar data.The results show that this tornado is ranked as F2.It is located at the front-right-hand side along the moving direction of the typhoon with about 390 km.This position is a convergence zone of strong southerly and southeasterly flows,with sufficient unstable energy,a stronger vertical wind shear,and a cold air intruding from the low layer.There is an obvious bow structure rather than hook or drape characteristics on the radar reflectivity graph,and a moderate intensity meso-cyclone existing in the low-level on the radial velocity graph.It is hard to define it as a supercell or non-supercell tornado according to the above information.