一次伴随阵风锋的强对流过程雷达回波分析
Analysis of Radar Echoes of a Strong Convection Process Accompanied by a Gust Front
梁明增 1杨杰1
作者信息
- 1. 中国民用航空飞行学院,四川广汉 618307
- 折叠
摘要
本文利用常规天气资料、多普勒天气雷达资料、探空和自动站资料,对2023年7月17日广汉机场附近发生的一次伴随阵风锋的强对流天气过程进行分析,表明:阵风锋过境时,温度下降,风向会突然转向,风速发生猛增;K指数、沙氏指数、T850-T500 和T7000-T500对预报雷暴大风有一定的指示意义;当雷暴中的强回波区快速降低高度时,形成强烈的下沉气流,生成阵风锋;由于阵风锋的高度低,在雷达上,在低仰角的反射率因子图上最先可以监测到弧形弱回波带;阵风锋移动过程中容易触发新雷暴的生成.
Abstract
Using conventional weather data,Doppler weather radar data,sounding and automatic station data,this paper analyzes a strong convective weather process accompanied by a gust front near Guanghan Airport on July 17,2023.The results show that when the gust front passes through,the temperature drops,the wind direction suddenly changes,and the wind speed increases sharply;the K index,Shackleberry index,T850-T500 and T7000-T500 have certain indicative significance for predicting thunderstorms and strong winds;when the strong echo area in a thunderstorm rapidly decreases in height,a strong downdraft is formed,generating gust fronts;due to the low height of the gust front,the arc-shaped weak echo zone can be detected first on the reflectivity factor map at low elevations on radar;the generation of new thunderstorms is easily triggered during the movement of gust fronts.
关键词
阵风锋/风切变Key words
gust front/wind shear引用本文复制引用
出版年
2024
NETL
NSTL
万方数据