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2017年秋季河北一次飑线引发的雷暴大风过程分析
引用本文:杨晓亮,杨敏.2017年秋季河北一次飑线引发的雷暴大风过程分析[J].气象与环境学报,2020,36(6):1-09.
作者姓名:杨晓亮  杨敏
作者单位:1. 河北省气象台, 河北 石家庄 0500212. 河北省气象与生态环境重点实验室, 河北 石家庄 0500213. 河北省气象行政技术服务中心, 河北 石家庄 050021
基金项目:创新基金;河北省气象局强对流创新团队共同资助
摘    要:利用常规地面高空观测资料、地面自动站资料、NCEP 1°×1°再分析资料、卫星云图、多普勒天气雷达资料等,对2017年秋季发生在河北省中部的一次由飑线引发的雷暴大风天气进行分析。结果表明:本次雷暴大风过程发生在高空冷涡底部,槽后冷空气与低层暖平流叠加配合地面冷锋的有利天气背景下,由飑线回波直接造成。环境条件中水汽和热力达到了中国华北地区产生强雷暴大风的平均值,大气温度直减率和垂直风切变比夏季更适宜,但能量不如夏季充足。飑线的强度、形态与夏季产生雷暴大风的雷达回波特征无异,但依据低层径向速度大值区预警秋季飑线大风需提高阈值。秋季飑线过程中地面同样伴随风场辐合、雷暴高压等中尺度系统,冷池密度流作用有利于地面大风产生。

关 键 词:秋季飑线  雷暴大风  雷达回波  对流云团  
收稿时间:2019-08-27

Analysis of a thunderstorm gale triggered by squall line in autumn of 2017 over central Hebei province
Xiao-liang YANG,Min YANG.Analysis of a thunderstorm gale triggered by squall line in autumn of 2017 over central Hebei province[J].Journal of Meteorology and Environment,2020,36(6):1-09.
Authors:Xiao-liang YANG  Min YANG
Institution:1. Hebei Meteorological Observatory, Shijiazhuang 050021, China2. Hebei Laboratory for Meteorological and Eco-environment, Shijiazhuang 050021, China3. Heibei Meteorological Administrative & Technical Service Center, Shijiazhuang 050021, China
Abstract:We analyzed a thunderstorm gale event triggered by squall line over the central Hebei province on September 21, 2017, using conventional sounding data, observational data at surface automatic weather stations, National Centers for Environmental Prediction (NCEP) 1°×1° reanalysis data, satellite cloud images and data from Doppler weather radar.The results show that the thunderstorm gale event occurs at the bottom of a high-level cold vortex and is directly triggered by a squall line, under favorable conditions of cold air behind a short-wave trough overlying low-level warm advection.Both water vapor content and thermodynamic conditions reach the mean level triggering strong thunderstorm gales in North China.Compared with conditions in summer, vertical temperature lapse rate and vertical wind shear in autumn are more suitable for developing a thunderstorm gale, although energy is not as sufficient as in summer.The intensity and shape of the squall line are similar to those of the radar-echo characteristics during summer thunderstorm gales.However, a higher threshold of low-level radial velocity is required for the early warning of squall line gale in autumn according to the area of low-level radial velocity exceeding the threshold.The squall line in autumn is accompanied by mesoscale systems at the surface, such as a convergence line of the wind field, and thunderstorm high pressure.The effect of density flow in a cold pool favors the formation of strong winds near the surface.
Keywords:Autumn squall line  Thunderstorm gale  Doppler radar echo  Convective cloud  
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