2015年7月浙江2次强对流天气过程对比分析

利用高时空分辨率观测资料、多普勒、风廓线雷达资料和数值预报产品对2015年浙江2次强对流天气进行对比诊断分析. 这2次过程差异显著，分别是较大范围短时暴雨和冰雹大风过程.短时暴雨发生在西风槽与位于日本的台风对峙形势下，中低层有低涡切变线,水汽条件好，中尺度云团不断原地生成并滞留；冰雹大风过程发生在副高边缘，东风波西移形势下，0 ℃层高度适宜，风垂直切变弱，风廓线雷达低层水平风速增大. 但两者也有共同点，从风廓线雷达的探测数据看，高度及垂直风速均可以较好地体现降水的开始和结束. 因此，强对流天气预报中，天气形势、雷达资料和物理量场对区分不同类别强对流天气具有较好的指示意义.

Comparative analysis of two strong convective weather processes in Zhejiang Province in July, 2015

Using the high temporal and spatial resolution data, Doppler radar images and numerical forecast products, two strong convective weather processes occurred in Zhejiang in July, 2015 are diagnosed and analyzed. One is short time rainstorm, another is hail with strong wind. The results show that the situation of westerly trough and typhoon in Japan, vortex shear line on the middle and low layer, ample water vapor condition and mesoscale clouds generated in situ have caused the heavy rainfall. The edge of the subtropical high and the easterly wave situation, the appropriate zero centigrade layer height, weak vertical wind shear, increased wind speed on the low layer have caused hail with strong wind. The beginning and the end of the precipitation can be reflected by the height data and the vertical wind speed of the wind profiler radar. Therefore, the weather situation, radar data and the physical quantity fields of the strong convective weather forecast have important instruction significance to distinguish the different kinds of strong convective weather.