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应用常规资料、自动站雨量资料等,对2009年5月9～10日发生在鲁西北和鲁中北部的一次区域性大暴雨进行分析。结果表明,低层冷式切变线是引发大暴雨的主要系统,暴雨主要产生在低空急流的左前方、低空冷式切变线右侧以及低涡的东北象限。副高西侧的西南急流建立起从南海到华北中部的水汽通道,为大暴雨的发生发展提供暖湿空气和能量,也是低层切变线长时间停滞的必要条件。地面锋面气旋则是暴雨开始的启动机制,锋后东北湿冷空气与西南暖湿空气在山东上空交汇,促使对流发展和不稳定能量释放产生暴雨。
Based on the conventional data and rainfall data of automatic stations, a regional heavy rainstorm occurred in the northwestern Shandong and northern Central Shandong Province from May 9 to May 9, 2009 was analyzed. The results show that the low-level cold shear line is the main system causing heavy rainstorm. The heavy rain mainly occurs in the left front of low-level jet stream, right-hand of low-level cold shear line and northeast quadrant of low vortex. The southwest rapids on the west side of the subtropical high establish a water vapor channel from the South China Sea to the central part of North China, providing warm and humid air and energy for the occurrence and development of heavy rainstorms. They are also necessary conditions for long-term stagnation of low-level shear lines. The surface frontal cyclone is the starting mechanism for the onset of heavy rain. After the front, the humid and humid air in the northeast meets the warm and humid air in southwest China over Shandong, prompting heavy rainfall in the development of convection and the release of unstable energy.