江西大暴雨天气三种雷达回波特征分析

Analysis of three radar echo characteristics of heavy rainstorm in Jiangxi Province

为了做好江西大暴雨天气的监测预警工作,基于MICAPS天气图、江西自动站和雷达拼图等数据,采用天气学、雷达气象学等原理与方法,对江西2022年4次大暴雨天气中的三种雷达回波形态进行分析,结果表明:江西大暴雨回波形态有短带回波、冷锋回波带和低涡回波团三种;短带回波当单体移动方向与回波带走向近似一致时,降水最强;冷锋回波带在东移过程中呈现顺时针转动,最后演变成东西走向;低涡回波团沿槽前西南急流朝东北方向移动,与切变线雨带合并后,回波团进一步发展壮大。研究结果旨在为江西大暴雨及短时强降水天气的短临预报提供分析依据。

In order to do a good job in the monitoring and early warning of heavy rainstorm weather in Jiangxi,based on MICAPS weather map,Jiangxi automatic station and radar puzzle data,the three kinds of radar echo patterns of three heavy rainstorm weather in 2022 in Jiangxi are analyzed,using the principles and methods of synoptic science and radar meteorology.The results show that there are three echo patterns of heavy rainstorm in Jiangxi:short band echo,cold front echo and low vortex echo cluster.When the direction of individual movement is approximately consistent with the direction of the echo band,the precipitation is strongest in the short band echo.The cold front echo band rotates clockwise during its eastward movement and eventually evolves into an east west direction.The low vortex echo cluster moves northeast along the southwest jet stream in front of the trough,and after merging with the shear line rain belt,the echo cluster further develops and grows.The research results provide an analytical basis for the short term and imminent forecast of heavy rainstorm and short time heavy rainfall in Jiangxi.