摘要
利用NCEP 1 1再分析资料、常规天气图、全国自动加密观测资料和石家庄多普勒天气雷达等资料,对发生在河北省中南部的一次短时暴雨天气过程进行了分析。结果表明:风速和风向在河北中南部的辐合促进了水汽的辐合。块状回波与带状回波交接处出现最大暴雨中心,逆风区和弱辐合区与较强降水相吻合。邢台次云区的形成与发展和北部主云区的发展密切相关,随着邢台北部低于-42云区范围扩大,邢台狭窄的强对流回波带形成。地面加密风场的变化以及中尺度辐合线的形成均对短时暴雨的发生有较好的指示作用,带状回波在地面辐合线附近快速强烈发展,而且随着河北中南部地面辐合线的消失而原地减弱。
Based on the NCEP reanalysis data（1°×1°）,the conventional weather maps,the meteorological data from intensive automatic stations and Doppler weather radar data in Shijiazhuang,a short time heavy rain process in the middle and south of Hebei province was analyzed.The results show that convergence of wind speed and wind direction in the middle and south of Hebei province promotes the convergence of water vapor.The maximum centre of heavy rain is near the place of connection of bulk echo and banding echo,and the position of strong precipitation coincides with the adverse wind area and weak convergence area.The formation and development of cloud area at Xingtai is related to the development of main cloud area in the north of Hebei province.With the extension of cloud area where temperature drops below-42 ℃,the strong and narrow banding echo is formed at Xingtai.The variations of surface intensive wind fields and the formation of mesoscale convergence line are indicative for occurrence of a short time heavy rain.Banding echo develops rapidly near convergence line on the ground,and it weakens with the disappearance of the convergence line on the ground in the middle and south of Hebei province.
出处
《气象与环境学报》
2011年第5期32-37,共6页
Journal of Meteorology and Environment
基金
国家重点基础研究发展计划"973"项目(2009CB421503)
国家自然科学基金(40775033)共同资助
关键词
短时暴雨
强对流
地面辐合线
带状回波
冀中南
Short-term heavy rain
Strong convection
Surface convergence line
Banding echo
The middle and south of Hebei province
