The process of a rainstorm in the south of Yichun City on April 25-26,2022 was analyzed.The results show that:Heavy rainfall mainly occurs in the warm region.The circulation background of this rainstorm is that the upper trough carries cold air southward and the warm and humid air to the northwest of the subtropical high intersects in Yichun.The upper trough carries cold and dry air intrusion,the shear line close to the middle and low levels,the strong southwest jet,the coupling of the high and low air jet and the surface convergence line are the main influencing systems of this rainstorm.The ground convergence line is the rainstorm triggering system in the south of Yichun.The radar echoes in this rainstorm process are mainly low-quality core,high-efficiency and strong echoes,which cause obvious"train effect"in the development of the southern line of Yichun.In this frontal precipitation,the large-scale model has a large deviation in the forecast of the system position and moving speed,while the mesoscale model has a better grasp of the precipitation intensity and falling area.Some of the captured information can be combined with reference in daily forecast.
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