Abstract:

By using the conventional meteorological data，a meteorological analysis on the large scale circulation background，the synoptic scale influencing systems，the hourly evolvement of satellite cloud image and the atmospheric stratification stability that caused the formation and the development of the meso - α - scale convective system，which caused the severe convective weather process on May 30，2005，was done in this paper；and based on the physical quantity products of T213 numerical weather forecast model，a dynamic analysis on the distribution of physical quantity fields of the system was also done. The results show that under the favorable conditions of temperature and humidity and dynamic factors，such as the Mongolia cold vortex rotating and moving eastwards and southwards，the existence of both the high - level and low - level jet stream，the warm and wet tongue extending in the low layer，the cold and dry tongue in the middle layer，and the large area convective instability，several meso - γ - scale convective systems were excited，then they united into several meso - β - scale convective systems，eventually，the meso - α - scale convective system was formed by the coalition of the several meso - β - scale convective systems.

Key words: meso - &alpha, - scale convective system, routine meteorological data, T213 physical quantity products, analysis

摘要：

利用常规气象资料，对造成2005 年5 月30 日大范围强对流天气过程的中α 尺度对流系统发生、发展的大尺度环流背景、天气尺度影响系统、卫星云图逐时演变情况和大气层结稳定度进行了天气学分析；利用T213 数值模式的物理量预报产品对造成此次强对流天气过程的中α 尺度对流系统发生、发展的物理量场分布进行了动力学诊断分析。分析表明：此次中α 尺度对流系统的发生、发展是典型的由于蒙古冷涡旋转东移南压，在高低层有高空急流和低空急流，低层有暖湿舌伸展，中层有干舌叠加在低层湿舌之上和大范围存在对流不稳定层结等诸多有利的温湿条件和动力条件下，首先激发中γ 尺度对流系统，再由几个中γ尺度对流系统合并而成中β 尺度对流系统，然后由几个中β 尺度对流系统合并发展而成。

关键词: 中&alpha, 尺度对流系统, 常规气象资料, T213 物理量预报产品, 分析