福建省中南部一次强飑线过程分析

Analysis of a Heavy Squall in Central Southern Fujian Province

利用常规气象资料、自动观测站资料和多普勒雷达等资料,综合分析了2005年3月22日发生在福建省中南部地区的一次飑线天气过程。结果表明:福建处于上干冷、下暖湿的不稳定大气层结中,南支槽和冷锋的逼近触发了不稳定能量的释放和风暴的发生。强风暴发生在高空急流出口区左侧辐散和地面冷锋前侧辐合重叠区。多普勒雷达资料很好地揭示了该飑线的发展、演变和移动特征。速度场的分析可以较早获得飑线东移中将发展加强的信息,对短时临近预报有指导意义。

Based on conventional data, AMS （Automatic Meteorological Station） data and Doppler radar echo data, a squall happened in the central southern Fujian Province on 22 March 2005 is analyzed, The results show that Fujian was located in an unstable stratification being the dry and cold at the upper level and wet and warm at the lower troposphere; the approaching of the south trough in the westerlies and the cold front triggered the release of unstable energy, The heavy squall appeared in the superposed zone of the left divergence area around the exit of the upper-troposphere jet and the frontal convergence area of the surface front, The squall＇s evolution process can be well demonstrated by Doppler radar and AMS data.