By used the conventional meteorological data,FY-2C satellite data,ECMWF data and reanalysis data of T639(1°×1°),the meso-scale environmental characteristics and snowfall area were analyzed of 26 warm-zone 12 hours of heavy snowfall weather processes from 2003 to 2013(November to next March) in northern Xinjiang.The results showed that heavy snowfall produce in two kinds of atmospheric circulation,polar vortex type and short wave trough type,heavy snowfall area were located the front of the low trough,the front of exit area of low level jet;convergence zone and entrance area of high altitude jet,divergence area on it right;the northeast of convergence line of 700 hPa and 850 hPa warm shear line,the southeast of dry line;overlap area of the relief and heating-up near the ground convergence line.Over the heavy snowfall area,the whole troposphere be > 80% humidity;Below 500 hPa with unstable stratification,strong vertical wind shear,strong baroclinicity;700 hPa convergence line and 850 hPa warm shear line and dry line,ground dry line and convergence line are easy to make the unstable energy release,thus providing conditions of water vapor,thermodynamic and dynamic for the production of Heavy Snow.Warm-zone snowfall mainly occurs when it began to moving eastward the front of meso-scale cold cloud cluster and the front of the biggest area of TBB genting bright temperature gradient.Finally,the three-dimensional space model is summarized for warm-zone heavy snowfall.
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