Analysis on a Heavy Precipitation Event in Central and Eastern Xizang in Late February 2024
Cili Yangzhui
Xiangba Yongzhong
Yu Xueting
Yu Yanqun
Yang Dan
Abstract：This paper analyzes the causes of precipitation weather from 20:00 on February,21st to 20:00 on Febru-ary,23rd,2024 by using meteorological observation data such as MICAPS conventional ground data and FY4A satel-lite cloud images.The results show that:(1)On the 500hPa level,the middle and high latitudes of Europe and Asia are in a two-trough-one-ridge pattern.On the plateau,the central-eastern part of Naqu to the north of Shannan was af-fected by the plateau trough.The cold air from the northern Balkhash Lake trough converged with the southwest warm and humid airflow in the central-eastern region of our region,and the establishment of low-altitude rapids in the south was conducive to water vapor transport to the plateau.(2)When precipitation occurred,the central-eastern parts were in a significant wet area.The difference between the ground dew point temperature and the ambient tem-perature approached saturation,and the ground experienced temperature rise and pressure drop before precipitation,providing favorable water vapor conditions for the occurrence and sustenance of precipitation weather.(3)Upper-lev-el divergence and persistent sinking and ascending motions provided favorable dynamic conditions for the precipita-tion in the central-eastern region.(4)Through a comparative analysis on various model forecast fields,the EC model forecast was closer to the actual situation,demonstrating good indicative properties.
Keywords：Heavy precipitation in the central-eastern regionPlateau troughLow-level jet streamCirculation pat-ternPhysical quantities
Publication Date：2025-02-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 35-40 )