Abstract:Using conventional observation data, automatic weather station data, the high resolution model of ECMWF data, and FY 2E TBB data, 1 km and FNL data, the reason for regional rainstorm in Northern Xinjiang in 20-21 June 2013 was analyzed and compared with the early analysis of rainstorm that had happened in Southern Xinjiang. The results showed that the Central Asian vortex was the main influencing system. The rainstorm was directly caused by in the middle and lower troposphere and the ground meso scale system. Meso γ convection system was monitored by both the cloud image and the automatic station wind field. Affected by the terrain of the Altai Mountains and Sharbasitao, the mesoscale low vortex and the cyclonic vortex along the piedmont from the southeast to the northwest at 850 hPa rotated, stranded and enhanced, making the divergence structure of low level convergence and high level divergence formed and the strongest vertical upward movement at the same time enhanced rainstorm to increase. This heavy rain process was different from the heavy rain in Southern Xinjiang.