【摘要】 利用2004—2011年29次暴雨过程的多普勒天气雷达资料和常规天气资料,分类总结了河北中南部暴雨的主要雷达径向速度特征。发现形成河北中南部暴雨的主要雷达径向速度特征有5类:β中尺度辐合线、β中尺度辐合、γ中尺度辐合、高空急流和深厚持久的低空急流。深厚持久的低空急流是大范围暴雨的主要速度特征之一。高空急流是大范围暴雨和区域暴雨共有的速度特征。β中尺度辐合线、β中尺度辐合、γ中尺度辐合是大范围暴雨、区域暴雨和局地暴雨共有的速度特征和主要的中小尺度影响系统。列车效应是造成局地暴雨、大暴雨的关键原因。更多还原

【Abstract】 By using the Doppler radar data and the conventional observation of 29 torrential rain processes from 2004 to 2010 the velocity field characteristics in rainstorms in south-central Hebei Province are analyzed.It is found that the characteristics can be divided into five categories,including the meso-p scale convergence line,the meso-β scale convergence,the meso-7 scale convergence,the upper-level jet and the long-lasting and deep low-level jet.The last one is one of the main velocity field features of large-range severe rainstorms.The upper-level jet is the characteristic of both large-range heavy rainstorms and regional heavy rainstorms.The meso-β scale convergence line,the meso-P scale convergence and the meso-7 scale convergence are common features and main meso scale systems of all the three types of severe rainstorms.In addition,train effects is a key cause of local severe torrential rains.更多还原