Analysis of Circulation Characteristics of Hail Weather in Qiannan
Based on 30 hail events in Qiannan Prefecture from 2006 to 2022,this paper analyzes the corresponding conventional upper-air and surface meteorological data by means of synoptic analysis method to establish a localized weather concept model regarding the configuration of weather background flow types and T-logP patterns prior to hail occurrence in Qiannan Prefecture.The findings indicate that the synoptic patterns preceding hail events in Qiannan Prefecture can be categorized into three types:thermal low-pressure convergence type,elevated thunderstorm type,and cold-front low-trough(shear)type.The surface flow pattern is dominant,supplemented by high and low air flow patterns.The characteristics of the three types of synoptic patterns are as follows:(1)The central and northern parts of Qiannan Prefecture exhibits a higher frequency of hail occurrences under the thermal low-pressure convergence type,the central part tends to have more frequent hail events under the elevated thunderstorm type,and the central and southern parts encounter increased hail frequencies under the cold-front low-trough(shear)type.(2)There are four T-logP patterns,including funnel-free shuttle pattern,no funnel shuttle pattern,small funnel shuttle pattern,and large funnel shuttle pattern.The thermal low-pressure convergence type is primarily featured with a large funnel shuttle pattern,the elevated thunderstorm type with a funnel-free shuttle pattern,and the cold-front low-trough(shear)type with a no funnel shuttle pattern.
NETL
NSTL
万方数据
