摘要
利用MICAPS天气资料、江西Web GIS雷达拼图、自动站、强天气监测和雷电监测等数据,对2017年8月17日强天气过程,采用数据统计、形态特征对比等方法进行分析,结果表明:588线是区别江西是否处在副高边缘的关键指标,强天气分布在588~584线之间,0度涡度线与588线重叠最易产生强天气。回波的不断合并是形成雷暴大风和冰雹等强天气的主要演变方式。回波的传播方式一方面加快了回波移动速度;另一方面改变了回波的移动方向。回波系统在不断向东移动过程中,其东南侧不断触发产生新的对流单体,通过不断合并,不断新生单体,形成向东东南方向"传播"的发展趋势,造成回波系统向东南方移动。强天气过程的回波特征有2种:一是短带回波,有时会发展为弓状回波结构;二是强单体回波和超级单体回波结构。带状回波上雷暴大风分布在回波带前沿,尤其是弓状回波带的头部;雷电分布在回波带移动方向的后侧,前方发展旺盛的回波单体上雷电反而少,后方减弱阶段的回波雷电密集。强单体回波和超级单体回波上,雷暴大风和雷电集中在强回波中心附近区域。
Using mica PS weather data, Jiangxi WebGIS radar jigsaw puzzle, automatic station, strong weather monitoring and lightning monitoring data, this paper analyzes the strong weather process on August 17th, 2017 by means of data statistics and morphological features comparison. The results show that 588 line is the key indicator to distinguish whether Jiangxi is on the edge of subtropical high, and the strong weather is distributed between 588 and 584 lines, with 0 degree vorticity line overlapping 588 line being the most likely to generate strong weather. The continuous merging of echoes is the main evolution way of forming strong weather such as thunderstorm, gale and hail. On the one hand, the propagation mode of echo accelerates the moving speed of echo. On the other hand, the moving direction of the echo is changed. During the process of the echo system moving eastward, the southeast side of the echo system continuously triggers to generate new convective monomers.Through continuous combination and continuous newborn monomers, the development trend of ＂propagation＂ in the southeast-east direction is formed,which causes the echo system to move southeast. There are two kinds of echo characteristics in the strong weather process：one is short back waves, which sometimes develop into bow-shaped echo structures;Second, the structure of strong monomer echo and super monomer echo. Thunderstorms and strong winds are distributed in the front of the echo band, especially in the head of the bow-shaped echo band. Lightning is distributed on the back side of the moving difection of the echo zone, but there is less lightning on the booming echo monomer in front, and the echo lightning in the weakening stage in the back is dense. Thunderstorm wind and lightning are concentrated near the center of strong single echo and super single echo.
作者
高建平
吴才明
罗燕
周丹红
冷健
GAO Jianping;WU Caiming;LUO Yan;ZHOU Danhong;LENG Jian(Shanggao County Meteorological Administration,336400,Shanggao,Jiangxi,PR)
出处
《江西科学》
2018年第5期737-743,848,共8页
Jiangxi Science
基金
中国气象局气象关键技术集成与应用项目(CMAGJ2013M74)
中国气象科学研究院开放课题(2012LASW B01)
南京雷达气象与强天气开放基金(BJG201205)
关键词
江西副高边缘
雷暴大风
短时强降水
温度锋区
合并与传播
回波特征
Jiangxi subtropical high edge
thunderstorm wind
short-term heavy rainfall
temperature front zone
consolidation and dissemination
echo feature
