“20030816”云南暴雨过程的中尺度分析

 应用天气图、卫星云图TBB资料和多普勒雷达回波资料,分析了云南2003年8月16日的暴雨天气过程.结果表明:这次暴雨过程时空分布具有明显的中尺度特征,大尺度天气形势为中尺度系统的形成和发展提供了有利的环流背景、不稳定条件、能量条件和动力条件;在卫星云图上切变线云系在西南移过程中发展形成飑线,其上诱发产生的3个中-α尺度云团和1个中-β尺度的云团直接造成了强降水;在多普勒雷达上偏东风和偏西风之间的中-β尺度的切变线和逆风区对中-α尺度飑线的形成和发展起着重要作用,还诱发产生出了超级单体和中气旋,中-α尺度飑线导致了这次暴雨天气过程.

Mesoscale analysis of "20030816" rainstorm process in Yunnan

By using synoptic charts,hourly GMS5 infrared TBB pictures and Doppler radar echo data,the rainstorm process on August 16,2003 has been analysed.The results show that there is an obvious mesoscale character of the rainstorm in spatial and temporal distribution.The macroscale synoptic situation supplies suitable circulation background,instability condition,energy condition and dynamical condition for the forming and development of the mesoscale system.The shear cloud system develops into a squall line.And the three mesoscale α cloud clusters and one mesoscale β cloud cluster aroused by the shear cloud system produce the heavy rainfall by analysing satellite cloud pictures.The mesoscale β shear line between east wind and west wind and the contrary wind are very important to the forming and development of the mesoscale α squall line by analysing the Dopplar radar echoes,arousing a supercell and a vmaxmesocyclone,and the mesoscale α squall line directly produces the rainstorm process.