连续冰雹天气的物理量场特征分析

对１９９７年４月２８～２９日山东连续两天出现大范围冰雹天气的天气系统和热力及动力场特征进行了分析。结果表明，这次连续性大范围冰雹天气过程是由冷性低涡影响产生的。冷锋触发对流不稳定能量释放，产生强对流。冰雹产生在中低层对流不稳定、高能舌和低层暖平流、高层冷平流以及低层辐合、高层辐散的上升运动区。对流有效位能和高层正涡度平流对冰雹的产生起主要作用。

The Physical Features of A Continued Hail Shooting Weather Process

The weather system,thermal and dynamical features of the continued hail shooting weather process over a large area in Shandong Province on 28-29 April 1997 were analyzed.It is shown that the continued hail shooting process is caused by a cold vortex.The cold front triggered off convective instability energy and a stronger convection produced.Hail shooting located in the area with convective instability, high energy tongue at the middle low level,warm advection and convergence in low level and cold advection and divergence at the high level,and ascending motion.CAPE and stronger positive vorticity advection affected importantly the hail shooting.