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中文摘要：
利用常规观测资料和NCEP再分析资料对2011年6月18日常州大暴雨过程从中尺度分析，物理量场诊断和雷达回波等进行了成因分析，结果表明：（1）中低层切变线、梅雨锋是本次暴雨过程产生的重要影响系统。（2）地面中尺度辐合线是造成常州、金坛出现强降水的主要原因之一，而中尺度辐合线和中尺度气旋的共同作用则是溧阳出现强降水的重要因素。（3）此次暴雨过程中，常州地区位于高能区，层结不稳定。强降水发生时，水汽明显加强，边界层的抬升运动也明显增强，存在较强的垂直上升运动。（4）西南急流为本地输送充沛的水汽和大量的不稳定能量，东北急流提供冷空气，促使冷暖气流强烈交汇，从而导致了暴雨的发生。（5）中1尺度和中p尺度系统长时间维持，有利于连续强降水的产生。
英文摘要：
By using the NCEP/NCAR reanalyzed data and observation data a heavy rainfall occurred on June 18,2011 in Changzhou has been analyzed. The results show that the process is resulted directly from Meiyu front and shear line. It is found that the ground mesoscale convergence line results in the strong precipitation of Changzhou and Jintan, and the mesoscale convergence line and mesocyclone cause jointly the heavy rainfall of Liyang. The trend of strong rain belt is in agreement with the convergence line. In the rainstorm Changzhou is located in the area with high and unstable energy. When the rainfall occurs, the steam has been intensified noticeably, and the elevating of the boundary layer is also improved significantly, there is relatively strong vertical motion. The southwest jets have an important effect on the transportation of the moisture and energy, and the northeast jets offer cold air to meet with warm air and lead to the occurrence of rainstorm. It is also shown that the maintenance of the meso-β scale and meso-γscale system contribute to the continuous strong precipitation.
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