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利用地面观测资料、FY-2C卫星红外云图及中尺度数值模式WRF对2010年7月19-20日河北省南部和中东部一次区域性大暴雨过程进行了诊断分析和数值模拟研究。结果表明,海上热带低压对西南涡的稳定和维持有远距离作用。由于热带低压的存在而促使西南低涡的发展,使西南低空急流在河北突然增强,降水得以再度加强;冷空气从高空侵入、下沉,加强了大气斜压性,迫使对流层中层空气的抬升,为西南涡的发展提供了动力条件;暖湿气流主要来自西南涡携带的西南气流及海上低压和西太平洋副热带高压的东南气流输送,为暴雨加强提供了充沛的水汽和热力条件。“,”Using the mesoscale numerical model WRF,the regional rainstorm in middle-east and south of Hebei Province on 19-20July 2010was diagnostically analyzed and numerically simulated.The results show that:The tropical depression has an long distant effect on the reinforcement of southwest vortex,due to the promoting of the presence of the tropical depression to the development of the southwest vortex,the southwest low-level jet intensify in Hebei,corresponding the precipitation is further strengthened;the cold air intrusion strengthens baroclinicity,the air on middle troposphere is forced to lift,which provide the motive conditions for the development of southwest vortex;The warm air is formed by the combination of the southwest flow from southwest vortex and the southeast air stream around subtropical high,which supply the water vapor and abundant energy for the reinforcement of the regional rainstorm.