2018年7月15—16日房山区局地大暴雨天气过程分析

Analysis of the July 15-16 2018 Local Torrential Rain Process in Fangshan District

本文利用常规观测资料、自动气象站降水资料、南郊观象台雷达资料、FY-2G卫星资料、GPS水汽探测资料及霞云岭风廓线资料,对北京市房山区2018年7月15—16日局地大暴雨天气过程进行分析,探讨此次天气过程发生的成因。结果表明:此次暴雨天气过程是由副高外围暖湿气流配合高空槽造成的,低层暖湿气流加强为其提供动力条件;水汽平流输送带来丰沛的水汽,是形成此次强降雨过程的重要条件;高空槽系统前部发展的暖区对流是造成局地大暴雨的直接原因,但其发生发展的机制仍有待于进一步研究。

By using conventional observation data, automatic weather station precipitation data, radar data of South suburban observatory, FY-2G satellite data, GPS water vapor data and wind profile data of Xiayunling, this paper an- alyzed the local torrential rain weather process of July 15-16, 2018 in Fangshan district, and discussed the causes of this weather process. The results showed that the process of rainstorm weather was caused by the peripheral warm and humid air of subtropical high combined with the high trough. The abundant water vapor brought by advection was an important condition of the rainstorm. The warm convection in the front of the high trough system was the direct cause of local torrential rain, but the mechanism of its occurrence and development was still to be further studied.