Atmospheric Circulation Conditions and Early Warning Capability of a Local Extremely Heavy Rainfall in Pearl River Delta
Using conventional meteorological observation data,the products of Doppler weather radar and the 0.25° × 0.25° ERA5 reanalysis data,this study analyzes a local short-time heavy rainfall in Nanhai District,Foshan City,Guangdong Province from 17:00 BT to 19:00 BT on 1 August 2021.The results show that the circulation background of the short-time rainstorm is a forward trough with an 850 hPa shear line.The strong mid-level upward motions and the persistent low-level water vapor transport provide favorable dynamic and water vapor conditions for this extremely heavy rainfall.The long-duration existence of the cyclonic vortexes and convergence on the ground may be one of the important reasons leading to the occurrence of this extremely heavy rainfall.This paper also analyzes the meteorological service for the extremely heavy rainfall and summarizes the work experiences,which can provide reference for meteorological services in the future.
extremely heavy rainfallVILwarning signals for heavy rainfallDoppler radar echo
万方数据
维普
