There are mesoscale low level convergence and high level divergence in the thunderstorm area.
同时又存在明显的低层辐合高层辐散的中尺度流场。
Severe convergence brought by Low-level jet pulsation, and severe divergence brought by upper-level jet is directly trigger mechanism of this intense rainstorm.
低层低空急流脉动产生的强辐合，高空急流诱发的高层强辐散是本次东北地区暴雨天气的直接触发机制。
The causations of heavy rain in this area are convergence in the low level and intensity of cyclonic vorticity and strong upward motion.
低层辐合和气旋性涡度的加强所产生的强上升运动造成较大的降水过程。
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