2010年铁岭地区一次暴雨过程诊断分析

Diagnostic Analysis on a Torrential Rain Process in Tieling Regions in 2010

采用常规资料、多普勒雷达资料、自动站资料,对2010年8月19～22日铁岭地区出现的暴雨到大暴雨天气过程进行诊断分析。结果表明,受高空槽、副热带高压后部深厚的暖湿气流和切变线共同影响,铁岭地区出现了暴雨到大暴雨天气;这次过程主要影响系统是地面气旋倒槽;700和850 hPa切变线、急流使中低层辐合加强,形成了较强的动力抬升和水汽辐合;铁岭地区处于强而宽的假相当位温锋区中,位势不稳定的建立是造成此次强降水的必要条件。

Based on the conventional observation data,Doppler radar data,the automatic weather station data,diagnostic analysis were carried out for heavy rainstorm process on August 19–22 of 2010 in Tieling regions.The results indicated that because affected by upper trough,deeply warm-wet air current in the back of subtropical high and shear line mutually,heavy rainstorm process Tieling regions generated.The main influencing system of this process was ground cyclone inverse trough.Moreover,middle and lower levels convergence were strengthened based on 700 and 850 hPa shear line and jet stream,thus,stronger dynamic lift and water vapor convergence came into being.Tieling was located in the strong and wide potential pseudo-equivalent temperature frontal zone,so the establishment of potential instability was the indispensable condition for this precipitation process.