摘要
2021年7月17日至23日河南省出现了极端暴雨天气,引发特大洪水、泥石流、城市内涝等严重灾害。结合河南省地面自动站观测数据和雷达组网拼图产品对此次暴雨过程进行分析。结果表明,此次河南省暴雨具有降雨强度大、持续时间长、暴雨落区重叠的特点。雷达组网拼图显示中尺度对流系统多次移经、合并或停滞在河南省中北部,“列车效应”明显,是造成此次暴雨的直接原因。强回波中心、地面辐合线和“逆风区”持续维持在郑州市主城区,促使降水回波进一步加强,是7月20日16:00至17:00郑州市极端降水的关键因素。
Extreme rainstrom occurred in Henan from July 17th to 22nd,2021,which caused serious di⁃sasters such as extreme floods,mudslides,and urban waterlogging.Based on observations from the auto matic weather station and radar network mosaic,the event was analyzed.The results indicate that the rainstorm had the characteristics of severe rainfall intensity,long duration and overlapping rainfall areas.The radar network puzzle shows that the mesoscale convective system has moved,merged or stagnated in central and northern Henan for many times,causing obvious"train effect",which was the direct cause of the extreme rainstrom.The strong echo center,ground convergence line and adverse wind area main⁃tained in the main urban area of Zhengzhou promoting the echo to be further strengthened,which was the key factor of extreme precipitation in Zhengzhou from 16:00 to 17:00 on July 20.
作者
王倩倩
WANG Qianqian(Meteorological Observation Data Center of Henan Province,Zhengzhou 450003,China)
出处
《河南科技》
2022年第9期123-126,共4页
Henan Science and Technology
关键词
极端暴雨
雷达回波
列车效应
extreme rainstrom
radar echo
train effect
