秦皇岛一次飑线冰雹天气分析
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引用本文:刘 贞,郭鸿鸣,李 飏,等.秦皇岛一次飑线冰雹天气分析[J].气象与环境科学,2017,40(4):100-108.Liu Zhen, Guo Hongming, Li Yang, et al.Synoptic Analysis of a Squall Line Hail Weather Process in Qinhuangdao[J].Meteorological and Environmental Sciences,2017,40(4):100-108.
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作者单位
刘 贞,郭鸿鸣,李 飏,等  
DOI:10.16765/j.cnki.1673-7148.2017.04.014
基金项目:
中文摘要:利用常规探测资料、自动站观测资料、多普勒天气雷达资料等对2014年6月26日发生在秦皇岛市的一次飑线冰雹天气过程大尺度环流背景、雷达回波特征及灾害性冰雹大风形成原因进行了分析。结果表明:本次飑线过程是受高空冷涡后部冷空气、低层暖切变共同作用的结果;飑线过境前后,气象要素变化比较明显,风向突变、风力猛增、气压涌升、气温急降、相对湿度上升;本次强风暴影响系统尺度为中α尺度,“弓”形回波结构明显,同时有雷暴出流边界;速度图上的风速大值区、后侧入流、中低层径向辐合及垂直风廓线图中低层风的转变信息等对大风的预警有明显的预示作用,且从雷达四维变分分析可知850 hPa辐合上升运动较强,中层有干冷空气入侵;回波垂直剖面图上飑线前沿低层存在有界弱回波区,中高层有回波悬垂。
中文关键词:飑线  冰雹  大风  强对流
 
Synoptic Analysis of a Squall Line Hail Weather Process in Qinhuangdao
Abstract:This paper carried detailed analysis and research on a squall line hail weather process on June 26, 2014 in Qinhuangdao for the large scale circulation background, radar echo characteristics and severe hail winds formation cause by using conventional observation data, automatic station observation data and doppler weather radar data. The result shows that the squall line process is influenced by high altitude cold air at the back of the cold eddy, together with the low level warm shear. Meteorological elements had obvious changes before and after the squall line passing across, the wind direction mutation, wind speed surge, the air pressure upwelling, the temperature drop, the relative humidity rise. System scale for this strong storms was meso α scale, the bow echo structure was clear, and there was thunderstorm outflow boundary. The high wind speed area, rear inflow and low level radial convergence on the velocity diagram, and the transformation information of the low level wind in the vertical wind profile map had significant predictive effect on the strong wind alarm. The radar four dimensional variational analysis showed that 850 hPa convergence ascending motion was stronger, and there was middle dry cold air intrusion. On vertical section there is a bounded weak echo region on the bottom of squall line echo front, and echo overhang on middle and high level.
Keywords:squall line  hail  gale  strong convection
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