对流性暴雨沿着移动缓慢的冷锋及其前沿地区发生。
Along and ahead of the slowly moving cold front, heavy convective precipitation fell.
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 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.
对流云是形成暴雨、冰雹、龙卷风等灾害性天气的主要原因。
Some severe bad weathers, such as storms, hailstones and tornadoes, are mainly caused by convective cloud.
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