摘要
利用常规观测资料、FY-4A气象卫星红外云图以及多普勒天气雷达资料,分析了2019年5月17日夜间发生在京津冀中部伴有强冰雹、短时强降水和短时大风的强对流天气过程。利用VDRAS资料与国家自动站资料进一步揭示对流风暴形成的环境条件以及后向传播的机制。结果表明:在有利于强对流发生发展的大尺度环流背景场下,京津冀中部的对流系统迅速发展。前期京津一带的强对流天气形成较强的东北风冷池出流,与渤海湾的东南气流交汇,在廊坊北京交界一带形成了向南移动的地面辐合线,并触发了对流。由于新生风暴单体与成熟风暴之间的正反馈作用,使得在廊坊北部形成东西向带状风暴系统,造成对流风暴不断向西传播。向西传播的风暴与西北东南向的平流共同作用,最终导致风暴运动方向为西南方向,成为典型的后向传播风暴。
By using the conventional meteorological data,infrared cloud images of th FY4 Asatellite and doppler meteorological radar data,this paper analyzes a severe convective weather case occurred on 17 May2019 in the central Beijing-Tianjin-Hebei region,accompanied by a strong hail,short-term heavy precipitation and short-term strong winds.To further reveal the environmental conditions of the convective storm formation and the mechanism of backward propagation,the Variational Doppler Radar Analysis System(VDRAS)and meteorological data of a national automatic weather station are used.The results show that under the large-scale background field being favorable for the occurrence and development of strong convection,the convection system around the central Beijing-Tianjin-Hebei region developed rapidly.The convection system was triggered by a southward moving ground convergence line at the Beijing-Langfang border,which was the confluent area between the southeast air flow from the Bohai Bay and the strong northeast cold air flow generated by the cold pool formed by the strong convection weather in the Beijing-Tianjin region earlier.It is shown as a backward-propagating multi-cell storm.The main reasons for the backward-propagation are the strong wind shear in lower atmosphere(0 to 3 km)and the positive feedback effect between new and old storm cells.
作者
武冰路
尹泽疆
王萌
秦睿
程月星
WU Binglu;YIN Zejiang;WANG Meng;QIN Rui;CHENG Yuexing(Hebei Sub-Center of CMATC,Baoding 071000;Institute of Urban Meteorology,China Meteorological Administration,Beijing 100089;Chaoyang District Meteorological Service,Beijing 100016)
出处
《气象科技》
2020年第6期836-845,共10页
Meteorological Science and Technology
基金
河北省科技计划重点研发项目(19210310D)资助。
关键词
对流风暴
后向传播
超级单体风暴
VDRAS
冷池出流
convective storm
backward propagation
super-cell storm
VDRAS(Variational Doppler Radar Analysis System)
cold pool outflow
作者简介
武冰路,女,1991年生,工程师,主要从事天气预报业务教学工作,Email1482030339@qq.com。
