2012年7月25—26日呼和浩特市强降水天气过程分析

2012年7月25—26日,呼和浩特市先后出现了两次大到暴雨降水过程,文章利用常规天气资料、地面加密自动观测资料、雷达和云图等资料对这次过程进行了分析,结果表明:这两次强降水过程具有历时短、强度大的特点;两次降水过程是在"东高西低"的环流背景下,由中低纬、上下游、高低层系统共同作用、配置产生的,前一次降水过程使呼市近地面大气湿度增加,不稳定形势重新建立并且进一步加强,高空有干冷空气入侵后造成的局地的不稳定降水;云图和雷达对这两次短时强降水具有更加显著的指示意义。

Analysis on Heavy Precipitation Weather Process in Hohhot from July 25 to 26, 2012

Two heavy rain weather processes appeared in Hohhot from July 25 to 26 in 2012, this paper analyzed the weather process hy using conventional weather data, ground encryption automatic observational data, radar and cloud picture data. The results showed that the characteristics of two strong precipitations were short duration and biggish intensity. Two precipitation processes were in circulation background of the east-high and west-low. The joint action and configuration of the middle-low latitude weather system, the up-down stream system and high-low level system have contributed to this weather processes. The first rainfall process made Hohhot ground air humidity increased, the unstable situation established again and strengthened. The local instable precipitation occurred after the upper dry cold air intrusion. Cloud images and radar had more important instruction significance for both short-time heavy precipitation.