2019年建瓯一次飑线降雹天气分析

Analysis of a Hail Squall Line in Jianou in 2019

根据常规天气资料、多普勒天气雷达资料,对建瓯一次春季飑线降雹天气过程进行分析。结果表明:低空强烈的减压、增温、增湿有利于不稳定能量的积聚,当低层为西南急流控制时,具有辐散抽吸作用,使上升运动增强和维持,从而导致不稳定能量的释放和冰雹等强对流天气的产生;此次天气过程组合反射率因子图像上强回波中心的最大值可达65 dBz以上,垂直积分液态含水量(VIL)超过35 kg·m^(-2),降雹时降雹强单体对应的强中心高度Ht都出现了明显的"陡降"现象,利用多普勒雷达资料的这些识别指标可以提高对冰雹等强对流天气的识别能力。

This article uses conventional weather data,Doppler weather radar and other data to analyze a spring squall line hail weather process in Jian’ou.The analysis results show that strong decompression,warming,and humidification at low altitude are conducive to the accumulation of unstable energy.When the lower level is controlled by the Southwest Jet,it has a divergent suction effect,which enhances and maintains the upward movement,resulting in unstable energy.The release of strong convective weather such as hail and the occurrence of severe convective weather;Doppler radar data analysis shows that the maximum value of the strong echo center on the combined reflectivity factor image of this weather process can reach 65 dBz or more,and the vertical integrated liquid water content(VIL)exceeds 35 kg·m^(-2),the strong center height Ht corresponding to the strong hail during the hailfall has an obvious"steep drop"phenomenon.The use of these identification indicators of Doppler radar data can improve the recognition of severe convective weather such as hail ability.