The spatiotemporal distribution characteristics of Meso-α scale Convective System (MαCS) were analyzed in the summer of 2010-2014 in the Tianshan Mountains and their sides area by use of conventional observation and FY-2E satellite data, the characteristic of cloud image and environmental conditions from typical process was further discussed. The results showed that:(1) MαCS appeared frequently in June with the occurrence of majority of oval MαCS. The initiation and maximization period of MαCS was focused on afternoon and latter half of the night, and it terminated during the first half of the night, the peak time in three periods lagged sequentially about 2 h; the daily variation of circular MαCS and oval MαCS can be described with single-peak and multi-peak changes respectively. The life cycle of MαCS centered on 3~6 h, the frequency distributed widely in June, and intensively from July to August; the most oval MαCS sustained longer than that of circular MαCS. Extended time in stage of formation and dissipation of circular MαCS and oval MαCS respectively was displayed. (2) MαCS generated mostly in hillside plains or shallow areas in the Western Tianshan and inner Tianshan Mountains, and over the main part of central, Southeast and northeast Tianshan Mountains until it reached maximum extent, terminated in Yili Valley plains and on both sides of eastern Tianshan Mountain area at last. The long axis of cold cloud cover in the maturation period of MαCS concentrated mostly on the range between 500 km and 800 km; the area of cloud top decreased with the frequency of MαCS. Circular MαCS moved slowly while developing, and speeded up after the maximization, oval MαCS moved slowly from beginning to end instead. The TBBmin of MαCS cloud cluster showed unimodal and approximately normal distribution. The TBB average gradient in circular MαCS was greater than that in oval MαCS. (3) MαCS in Tianshan Mountains was formed mainly by the merging of more local meso-β scale convective bubble in large-area stratus cloud. The MαCS occurs easily in the pumping area of jet belt in high level and the convergence ascending area in front of trough in the middle-low level, abundant water vapor carried by the southwest and northwest airflow in the middle-low level gathers up under the background of the unstable stratification of the atmosphere and the continuous accumulation of unstable energy, which promotes the continuous development of MαCS.
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