2016年7月25日抚顺暴雨过程分析

Analysis of a Heavy Rainfall Process in Fushun on July 25,2016

利用常规资料、自动站观测资料以及数值预报产品,对2016年7月25日抚顺暴雨过程进行分析。结果表明,暴雨发生在偏西气流的纬向环流形势下,500hPa贝加尔湖冷空气东南移是造成此次抚顺暴雨的主要影响系统。冷空气是由贝加尔湖脊向东南方向移动导致;850hPa上,辽西地区有切变线东移,对抚顺地区降水产生直接影响,此次暴雨过程存在强盛的西南风低空急流建立,急流中心风速可达22m/s;200hPa存在强盛的高空急流,抚顺处于高空急流轴右侧,有急流的分流区。

The heavy rain process in Fushun on July 25, 2016 was analyzed by using conventional data, automatic station observation data and numerical forecast products. The results showed that the torrential rain occurred in the zonal circulation of westerly airflow. The southeast movement of cold air in Lake Baikal at 500 hPa was the main influencing system of the torrential rain in Fushun. Cold air was caused by the southeast movement of ridge over Lake Baikal. The shear line moved eastward at 850 hPa in Western Liaoning, which had a direct impact on precipitation in Fushun area. During the rainstorm, a strong southwesterly low-level jet was established, and the central wind speed of the jet could reach 22 m/s. There was a strong upper level jet at 200 hPa. Fushun was on the right side of the upper level jet axis, and there was a diversion zone of the jet.