一次区域大暴雨过程的雷达回波特征分析

针对2007年8月10—12日烟台市区域性大暴雨天气资料的综合分析表明,热带系统的水汽条件、西风带弱冷空气的抬升力条件和副热带高压边缘的不稳定层结条件,共同构成了区域性暴雨天气过程。对新一代多普勒天气雷达资料的分析表明:数条强对流回波单体在移动的过程中合并,形成MCS,稳定少动是暴雨产生的直接原因,低空急流输送大量水汽,低层冷空气入侵导致对流上升运动强烈。

Radar echo characteristics of regional heavy rain process

The regional heavy rain weather data from August 10 to 12,2007 in Yantai were analyzed.The results indicate that the regional heavy rain weather process is formed by the conjunct actions of water vapor of tropical system,uplift of weak cold air in westerly belt and unstable stratification at the edge of subtropical high.Based on the new generation Doppler radar data,many strong convective echo cells are united when they are moving,and come into being a mesoscale convective system(MCS).The stabilization is the direct reason causing heavy rain.Low-level jet can transport a lot of water vapor,and invasion of cold air in the low-level makes upward motion of convection strong.