The wet and warm degree in middle troposphere is weakened and the convective instability in lower middle troposphere is strengthened by increasing wind speed of southern flow.
对流层低层南风气流的加强，可影响对流层中层的暖湿程度减弱，从而加强了对流层低-中层内的对流性不稳定。
The heavy rain is presented under the condition of the strong positive vorticity, convergence, vapor flux convergence in middle and lower troposphere and stronger divergence at upper troposphere.
大暴雨发生在对流层中低层为气旋性涡旋、流场辐合加强、水汽通量增加、水汽通量辐合加强，并伴有高层较强辐散的情况下。
The seasonal reversal of wind field from the upper troposphere to the stratosphere is as pronounced as in the middle and lower troposphere.
东亚对流层中上部和平流层中下部风场的季节变化，与对流层中下部一样显著。
The warm high ridge at the middle and low troposphere and the lower pressure of the ground all provide the good circulation background of this heavy fog.
对流层中低层的暖脊和地面均压场的维持是此次大雾形成的良好环流背景。
The warm high ridge at the middle and low troposphere and the lower pressure of the ground all provide the good circulation background of this heavy fog.
对流层中低层的暖脊和地面均压场的维持是此次大雾形成的良好环流背景。
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