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通过对2011年8月19日南昌昌北机场雷雨大风天气过程分析,得出此次过程的主要影响系统为:高层东风波、季风槽前低层西南暖湿气流。此次东风波系统主要是受西太平洋副高和大陆副高之间的切变发展而成,东风波槽前和波轴上利于上升运动的出现,为强降雨提供了有利的动力条件,季风槽前强劲的西南气流提供了水汽条件。
Based on the analysis of the thunderstorm and windy weather process at Nanchang Changbei airport on August 19, 2011, the main influencing systems of the process are: the easterly waves in the upper layer and the southwest warm and humid flow in the south of the monsoon trough. This easterly wave system is mainly developed by the shear transformation between the subtropical high in the western Pacific and the subtropical high in the mainland. The rise of the easterly wave front and the wave axis is favorable for the ascending movement, providing favorable dynamic conditions for heavy rainfall. The monsoon The strong southwest airstream provides a vapor condition.