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The 10–30 day extended range potential predictability of the Beijing Climate Center Atmospheric General Circulation Model version 2.1 (BCC_AGCM2.1) model with high horizontal resolution has been evaluated, and the associated influencing factors and possible physical mechanisms have been discussed through a case study of the long‐lasting extreme snow storms over southern China in early 2008. Comparison with meteorological observations suggests that the BCC_AGCM2.1 model forced by the real daily sea surface temperature (SST) well reproduced the extraordinarily frequent and long‐lasting heavy snow storm process over southern China in early 2008 including the spatial distribution and temporal evolution of the 2 m air temperature and snow rainfall but produced relatively larger errors in precipitation. Overall, the BCC‐AGCM2.1 model forced by the real daily SST shows good potential …