闽赣地区一次静止锋前暴雨过程分析

Analysis of a Heavy Rain Process in Front of Stationary Front in Fujian-Jiangxi Region

文章利用雷达实况图、高空天气实况图、卫星红外云图及各物理参数,对闽赣地区1次静止锋前暴雨过程的环流形势、物理量及暴雨云团进行诊断分析。结果表明:暴雨的形成主要由于南支槽和副热带高压西北侧引导的暖湿气流、东北方向的冷高压南侧的东北气流以及西北方向的冷空气相互交汇,在闽赣地区上空形成静止锋,降水雨带主要位于静止锋前西南急流区。7月正值副热带高压稳定,3股气流呈僵持状态,在已生成云团的前缘不断有新的对流云团形成,随着新的对流单体形成云团,已生成的云团逐渐消亡,并重复上述过程,云团少变,因此,暴雨云团稳定地沿静止锋云带偏东北方向移动,是造成此次过程累积降水量大的主要原因。

The article uses radar live images,high-altitude weather live images,satellite infrared cloud images and various physical parameters to diagnose and analyze the circulation situation,physical quantities and storm clouds of a heavy rain before a stationary front in Fujian and Jiangxi.The results show that the formation of heavy rain is mainly due to the warm and humid airflow guided by the southern branch trough and the northwest side of the subtropical high,the northeast airflow on the south side of the cold high pressure in the northeast,and the cold air in the northwest direction.Front,precipitation rain belt is mainly located in the southwest jet stream area before the stationary front.July was when the subtropical high was stable,and the three airflows were in a stalemate.New convective cloud clusters continued to form at the front edge of the formed cloud clusters.As new convective monomers formed cloud clusters,the formed cloud clusters gradually died out.And repeating the above process,the cloud cluster changes little,so the storm cloud cluster moves steadily along the stationary front cloud belt northeastward,which is the main reason for the large amount of accumulated precipitation in this process.