The Spatial and Temporal Distributions of Severe Mesoscale Convective Systems over Tibetan Plateau in Summer

By using GMS-4 hourly IR stretched digital data from June through August 1991, all 293 severe Mesoscale Convective Systems (s-MCSs) Over Tibetan Plateau were investigated and analysed. The results show that those s-MCSs had larger frequency and more typical features of Meso-β scale system in its life cycle, size and intensity; their initiation and development was mainly derived from the thermotopographic effect; their movement basically consorted with the mean flow between 300 and 200 hPa, and few of them moved away from Tibetan Plateau.