The shearing wind helicity and thermal wind helicity are introduced and applied to a northeastern cold vortex rainfall event.
引入切变风螺旋度和热成风螺旋度，并将其应用于东北冷涡暴雨的诊断分析。
The structure of cold vortex cloud system is catalogued by two types, the simple vortex structure and the occluded cyclone structure.
冷涡云系的结构可归纳为单纯的冷涡结构和具有锢囚气旋结构两类。
It is shown that: (1) the anomalous cold vortex activity in Northeast China in the early summer is quite in concert with persistent circulation anomalies near the Ural Mountains and Japan.
主要结果为：(1)初夏东北冷涡活动显著异常与上游乌拉尔山附近和下游日本附近的持续性异常环流相对应。
Study shows that the process is caused by cold vortex in the east of Mongolia and subtropical high, and mesoscale convective cloud cluster is the direct reason of the local severe heavy rainfall.
发现本次过程是由蒙古东部的低涡与副热带高压共同作用发生的，而局地大暴雨的直接原因是中尺度对流云团所造成的。
Study shows that the process is caused by cold vortex in the east of Mongolia and subtropical high, and mesoscale convective cloud cluster is the direct reason of the local severe heavy rainfall.
发现本次过程是由蒙古东部的低涡与副热带高压共同作用发生的，而局地大暴雨的直接原因是中尺度对流云团所造成的。
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