【摘要】 常规情况下副高控制区域多为晴好天气,2007年8月25日在副高控制下的鹤壁浚县东南部却出现了短时局地特大暴雨天气。利用常规气象资料、物理量场、卫星云图及多普勒雷达资料对这次过程进行综合分析,结果表明:副高稳定控制下592 dgpm线西南侧大范围、持续性偏东南气流提供了水汽输送条件;副高脊线北侧高空辐散、中低层辐合的流场是导致不稳定能量释放、强对流产生的触发机制;700 hPa上呈SW-NE向的sθe高能舌从西南地区经河南伸向山东,且低层处于sθe>346 K的高能值区域,对这次强对流天气的产生有很好的指示意义;45dB z的强回波区具有一定范围和厚度、垂直方向呈塔状分布及速度图上有气旋性切变存在,会产生无冰雹的强对流天气。更多还原

【Abstract】 The weather in subtropical high zone is generally fine,while a short-time local extraordinary storm happened in southeast of Xunxian county controlled by subtropical high on August 25,2007.The process was analyzed by using the conventional meteorological data,physical quantity field,satellite cloud picture and Doppler radar.The conclusion showed that the wide and continuous southeast flow on the southwest side of 592 dgpm line transported the water vapor;upper air divergence on the north side of the subtropical high ridge line and flow convergence in mid-lower level were the trigger mechanisms of the unstable energy release and strong convection emergence.The development of θse high energy tongue at 700 hPa from southwest to northeast and the high region where θse>346 K at low level provided a good indication to the severe convective weather;there will happen non-hail sever convective weather in the condition that there were certain scope and thickness in 45 dBz severe echo area,turreted shape in vertical direction,and cyclone shear on the speed chart.更多还原