2018年8月中旬周口市一次暴雨天气过程分析

Analysis of a Rainstorm Weather Process in Zhoukou City in Mid-August 2018

利用自动气象站资料、卫星、雷达等相关气象资料,分析2018年8月中旬周口市一次暴雨天气过程。结果表明:此次暴雨天气是由台风“温比亚”登陆后减弱的低压和倒槽的共同作用造成的。降水期间,水汽条件、动力条件以及不稳定能量条件均较好,这些条件共同促进暴雨天气过程的发生发展。卫星云图上台风外围螺旋云带多次经过周口市及其附近区域,对应雷达图上回波强度较强的弧状回波消散后,又生成反复经过周口一带产生强回波“列车效应”,导致此次降水天气的持续时间较长。基于此,以2018年8月中旬周口市一次暴雨天气过程为例,重点分析了暴雨天气的环流形势、物理量,以期掌握暴雨天气的形成机制,为今后更好地开展防灾减灾工作提供指导。

Based on automatic weather station data,satellite and radar data,a rainstorm process in Zhoukou city in midAugust 2018 was analyzed.The results showed that the heavy rain was caused by the combined action of the weakened low pressure and inverted trough after the landing of typhoon“Humbia”.During precipitation,water vapor conditions,dynamic conditions and unstable energy conditions are good,which promote the occurrence and development of rainstorm weather.On the satellite image,the spiral cloud belt outside the typhoon passed Zhoukou city and its nearby area for many times.After the arc-shaped echo with strong echo intensity dissipated on the corresponding radar map,the“train effect”with strong echo repeatedly passed Zhoukou area was generated,resulting in the long duration of the precipitation weather.Based on this,a rainstorm weather process in Zhoukou city in mid-August 2018 was taken as an example to analyze the circulation situation and physical quantities of rainstorm weather,so as to grasp the formation mechanism of rainstorm weather and provide guidance for better disaster prevention and reduction work in the future.