摘要
根据常规观测、北京和天津多普勒天气雷达探测等资料,对2020年6月25日夜间发生在河北省廊坊市一次强对流天气过程进行分析。结果表明:高空冷涡前部高空槽叠加地面冷锋系统是此次超级单体风暴发生的背景条件,高CAPE值、强垂直风切变以及适当的0℃层和-20℃层高度等为其发展、维持提供了有利的环境条件。超级单体属于右移强风暴,发展演变过程中回波形状不断变化,中气旋特征持续存在,回波垂直结构呈现回波墙—回波悬垂和有界弱回波区—三体散射和旁瓣回波等典型超级单体雷达回波特征。55 dBZ及以上强回波迅速向高层伸展后迅速下降并配合较低的强回波质心高度,预示地面将出现大冰雹和灾害性大风;VIL最大值达到55 kg/m^(2)可以作为本地发布冰雹预警的指标,发布冰雹预警时间可以提前12 min;将VIL值升到40 kg/m^(2)作为地面灾害大风预警指标,发布雷暴大风预警的提前量为24 min。三维空间图像可以直观地展现出超级单体的空间结构。
Based on the conventional observation and Doppler radar detection in Beijing and Tianjin,the radar echo characteristics of a severe convective weather process occurred in Langfang City,Hebei Province at the night of June 25,2020 was analyzed.It shows that,the background condition of the supercell storm is the high slot in front of high-altitude cold vortex overlapped with the ground cold front system.A favorable environment for the development of the convective weather process are also provided by a high convective available potential energy(CAPE)value and strong vertical wind shear as well as an appropriate altitude of the layer with temperature between 0℃and 20℃.This supercell storm belongs to a right-ward moving strong storm,and the echo shape changes constantly during the development and evolution process with the mesocyclone feature persistence.The vertical structure of the echo shows typical characteristics of supercell radar echo,including echo wall-hanging echo,bounded weak echo area-three body scatter signature and sidelobe echo.In this process,the strong echo of 55 dBZ and above extends to the upper level rapidly and then falls down swiftly companied with a low strong-echo centroid height,which predicts that there would be a large hail and disastrous wind near the ground.The maximum value of vertically integrated liquid(VIL)around 55 kg/m^(2) could be used as a local indicator for issue hail warning,which could advance the hail warning time by 12 minutes.The VIL value up to 40 kg/m^(2) could be the warning indicator of the surface disaster gale,which is capable of advancing thunderstorm gale warning time by 24 minutes.
作者
王清川
刘艳杰
周涛
东高红
黄浩杰
李娜
WANG Qingchuan;LIU Yanjie;ZHOU Tao;DONG Gaohong;HUANG Haojie;LI Na(Key Laboratory of Meteorology and Ecological Environment of Hebei Province,Shijiazhuang 050021,China;Langfang Meteorological Bureau,Langfang 065000,China;Tianjin Meteorological Observatory,Tianjin 300074,China)
出处
《沙漠与绿洲气象》
2022年第3期54-61,共8页
Desert and Oasis Meteorology
基金
中国气象局预报员专项(CMAYBY2020-012)
廊坊市气象局科技项目(201902)。
关键词
多普勒雷达
中气旋
超级单体
雷达回波特征
Doppler radar
mesocyclone
supercell storm
radar echo characteristics
作者简介
王清川(1978-),男,高级工程师,主要从事灾害性天气短临预报预警研究。E-mail:hblfwqc@163.com;通信作者:东高红(1971-),女,正高级工程师,主要从事城市气象和中尺度天气预报技术研究。E-mail:qwerty8825@sina.com。
