[Objective] A severe convection weather process in Guangdong Province was studied. [ Method] By using conventional meteorological observed data and doppler radar data, the development, mechanism, circumfluence characteristics and radar echo wave evolvement structure of a severe convection process in Guangdong on Apr. 17th, 2011 were analyzed from aspects of weather situation, physical quantity and radar echo wave, and problems, countermeasures in pre-waming service were discussed. [ Result] Prefrontal flow vortex, convergence vortex are triggering factors of this supercell; 850 and 500 hPa obvious southwest air current provide vapor conditions for the supercess; the existence of inversion layer has significant relationship with hailstone. The maturity time of this supercell is about 2 h. [ Conclusion] The study will provide reliable predicting basis for similar weather process in the future, and provide feasibility argument for construction of pre-waming service system.%[目的]研究广东省一次强对流天气过程.[方法]利用常规气象观测资料和多普勒雷达资料,着重从天气形势、物理量场及雷达回波等方面,对2011年4月17日广东省一次强对流天气过程的发生发展、触发机制、环流特征、雷达回波演变结构进行诊断分析,并探讨了此次过程预报预警服务存在的问题及对策.[结果]锋前气流涡旋、切变线附近的辐合涡旋是这次超级单体的触发因子；850和500hPa明显的西南气流为超级单体的发展提供了有利的水汽条件；逆温层的存在与多地区出现冰雹有很大的关系.进一步证明了超级单体初生地在广西柳州附近是珠江三角洲地区东移系统中的一种；此次强对流天气过程中的超级单体初生时为活跃的多个小对流单体紧密组合,发展期≥50 dBz的回波合并成单一的块状,成熟期强反射回波区明显逆转,移向沿西江河谷走,过了肇庆东北山地进入平原时移速明显加快；该超级单体成熟期时间约2h左右.[结论]该研究为今后类似的天气过程提供可靠的预报依据,以及为预警服务系统的建设提供可行性的论据.
展开▼
