摘要
本文利用常规和非常规资料对2012年2月23日发生在闽北的一次冰雹过程进行中尺度特征分析。结果表明：这次冰雹过程是由高架雷暴引起的；高空前倾槽、低层切变线是影响这次强对流天气的主要影响系统，干冷空气入侵触发了不稳定能量的释放。同其他雷暴相比高架雷暴在近地层一直存在逆温层，并且逆温层是因为地面冷锋已过境而高空中低层强回暖造成的，逆温层之上有强的西南暖湿气流辐合和强垂直风切变，强的辐合上升运动发生在逆温层之上。
A hailstorm process in northern Fujian on Feb.23,2012 are analyzed in mesoscale level with the conventional and unconventional data. The hail were produced by elevated thunderstorms triggered by dry and cold air intrusion on surface under the joint impact from high level forward trough and low level wind shear. Unlike other types of thunderstorm, convection of the elevated thunderstorm did not initiate from the boundary layer or near surface layer.There existed inversion layer near the surface, which was formed when there was strong warm air advection in middle-low troposphere above the cold surface.The strong convergence in the moist southwest airflow and vertical wind shear both arose above inversion layer, then deep convection initiated over there also.
