Application of V-3θ Graphs in Hail Weather Forecasting for the Area of Maoming
WU Yongzhi
DENG Xiaoyao
CHEN Tiancheng
LING Kangmin
ZOU Futong
Abstract：Based on the principle of collapse and with the use of V-3θ graphs and structural approach,a hail weather process in Maoming was analyzed.The results are shown as follows.Through the V-3θ graphs the hail weather can be forecast if the following conditions are met:① There is a thick,super cooled layer(as deep as 50 to 100 hPa)at the tropopause;② the atmospheric structure is much inhomogeneous such that three θ curves of potential temperature have turns and bends on multiple layers and the θsed and θ*curves of potential pseudo-equivalent temperature between 850 and 500 hPa are at an obtuse angle with the T axis;③ the area enclosed by θsed and θ*are graphically characterized by a"big belly"and a"bee-like waist"clearly and the tropospheric atmosphere is drier at the upper portion than in the lower,and ④ the whole atmospheric column presents a"down-roll flow"structure.Due to their distinctive indication of hail weather,the V-3θ graphs can increase the forecasting accuracy.
Keywords：synopticsV-3θ graphhailpotential temperature θpotential pseudo-equivalent tempera-ture θsedMaoming area
Publication Date：2025-02-19
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)