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使用双向嵌套数值模式ＭＭ４ 对１９９２ 年７ 月２３ 日发生在副高北侧京津冀地区的一次大暴雨过程进行了成功的数值模拟。利用模拟得到的高时空分辨率资料，对伴随高、低空急流的次级环流进行了诊断， 结果表明： 激发次级环流的主要因子和台风、夏季江淮气旋有明显不同； 总的次级环流在降水前， 有利于天气区不稳定能量的积累， 而在降水过程中提供了持续稳定的上升运动条件； 急流和暴雨之间通过次级环流存在着正反馈相互作用。
A two-way nested numerical model MM4 was used to conduct a successful numerical simulation of a heavy rainfall event on July 23, 1992 in the Beijing-Tianjin-Hebei region on the north side of the subtropical high. The secondary circulation with high and low level jet streams was diagnosed by using the data of high spatio-temporal resolution obtained from the simulation. The results show that the main factors of the induced secondary circulation are obviously different from the typhoon typhoon JAC cyclones in summer. The total secondary circulation Precipitation is conducive to the accumulation of unstable energy in the weather zone, and provides steady and rising ascending movement conditions during precipitation. There is a positive feedback interaction between the rapids and the torrential rain through the secondary circulation.