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Using NCEP(1°× 1°) 6h reanalysis data and the conventional and unconventional observational data, a case study on the Deqin heavy snowfall occurred in November 2007 was performed to explore the generation process of the severe weather over the southeast part of Tibetan Plateau due to combination of Southern branch trough(SBT) in the Subtropical westerlies and storm over the bay of Bengal.