The physical conditions of rainstorm creating is related with plentiful vapor and instable strongly air convection and convergence upward movement.
产生冬季暴雨的物理条件与充沛的水汽、强烈的对流不稳定和辐合上升运动密切相关。
There is strong water vapor transport and convergence upward movement in the physical field.
过程期间，物理量场表现出强水汽输送辐合及上升运动；
The results show that the water vapor convergence and the strong upward movement between the freezing layer and the melting layer are the essential conditions for the formation of freezing rain.
结果表明，冻结层和融化层之间的水汽辐合和较强的上升运动是冻雨产生的两个必要条件。
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