一次罕见的东北路飑线天气过程分析

利用天气雷达、自动站及常规资料,对2005年6月21日夜间经过滨州市的一次东北路飑线天气过程进行分析。结果表明,诊断影响系统时要注意对流层高层的系统;横槽切变线,高层冷空气,低层暖空气,地面剧烈增温,都有利于促进对流不稳定;卫星云图上云团呈密实的椭圆形预示着对流非常强,可能会有飑线产生;在雷达回波图上呈人字形或弧形,有＂牛眼＂结构,主回波前缘有细长带状弱回波是出现大风的征兆;垂直风廓线上的低层水平风向的逆时针变化与地面自动站风的辐散相对应,地面自动站风的辐散处为下击暴流发生处。

Analysis on A Rare Squall Line Weather from Northeast

Based on weather radar,automatic weather station and conventional observation data,the squall line from northeast occurred in the night of 21 June 2005 in Binzhou City was analyzed.The analysis showed the characteristics of the meteorological elements.The system which plays a major role was in the upper troposphere.Transversal trough,shear line,high-altitude cold air,low-altitude warm air,and severe warming on the ground surface were conducive to the promotion of convective instability.They were the causes ...