一次强对流天气过程的成因分析

利用常规气象资料和多普勒雷达资料，从天气形势、物理量场和雷达回波演变特征分析2005年5月5日福建省强对流天气过程的成因。结果表明：这次强对流天气过程发生在锋前暖区内，高空弱冷空气的侵入对不稳定能量释放起触发作用，高低空急流的相互配置为强对流的发生提供了有利的动力抬升条件，大气的不稳定和良好的水汽输送条件有利于飑线的形成和发展，移入型的回波在福建境内发展加强形成飑线，飑线是此次强对流天气过程的直接影响系统。

Cause Analysis of a Strong Convective Weather Process

Based on the conventional observations and Doppler radar data, a strong convective weather process occurring over Fujian on 4-5 May 2005 is analyzed. The process happened over the prefrontal warm sector. It showed that the release of unstable energy was triggered by the invasion of weak cold air. Strong updrafts produced by the coupled high- and low-level jets were favorable for occurrence of the severe weather. Strong water vapor transport and atmospheric instability contributed to the formation and development of three squall lines, which were the weather systems directly causing the severe weather. The analyses of radar data indicated that three echoes grew into the squall lines in turn after they moved into Fujian Province.