一次强飑线雷达回波和云图特征

通过分析050322强飑线过程的天气背景,卫星云图和雷达回波变化特征,进一步验证了珠江三角洲锋前暖区强对流带状回波的一种模式1]。初步得出:飑线回波带初生阶段,母体回波中的40~55dBz强度廓线层水平尺度扩大明显,而且移向母体回波前边缘速度非常快。发展和成熟期强度廓线梯度大,弧形结构明显,40~55dBz强度廓线层顶部高,结构成柱状而且前进边缘比较整齐等特征。

Characteristics of Radar Echo and Satellite Images of a Strong Squall Line

Based on the observational data,satellite images and radar echoe,the model of band echo of strong convection in the warm sector before the front is further verified,which is often happened in the region of Pearl river.Primary results show as follows.The horizontal scale of the profile with 40-50dBz strength spreads distinctly in the parent echo of the squall line.They move to the fore boundary of parent echoes very quickly.The gradient of the strength profile becomes large and the bow structure turns to significant.The top of the profile is high with a bar structure and the fore boundary of moving is clear.