强降水期间，中高层弱冷空气侵入使对流加强和降水强度加大。

During the severe precipitation, intruding of weak cold air in the mid-and upper-level makes convection strengthened and precipitation reinforced.

因为弱冷空气的影响，昨天一天，杭州天色都阴阴的，偶尔有零星的小雨飘落，市区最高气温。

It was cloudy and scattered light rain yesterday because of the cold air. The highest temperature was 23.2.

结果表明，本次大暴雨是0418号热带气旋在福建登陆后，其北伸倒槽与西风带弱冷空气结合所产生的热带气旋远距离暴雨。

The result shows that the heavy storm is caused by the interaction between 0418 tropical cyclone trough landed in Fujian Province and a weak cool front in the westerlies.

2005年6月，由于受强盛的西南暖温气流和弱冷空气的共同影响，珠江流域经历了暴雨到大暴雨天气，西江流域中、下游普遍出现了超警戒水位。

Because of the powerful warm air current, southwest and weak cold air in June, 2005, the Peal River has gone through the heavy storm weather.