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This study investigates the impact of synoptic patterns of water vapor sources and local atmospheric vertical movements on local precipitation efficiency in various source areas. Results indicate that the conversion rates of precipitation contributed by EUP and NA are 11.5% (0.23 mm d-1) and 11.2% (0.22 mm d-1), respectively, which are lower than those contributed by TP and SEC at 9.5% (0.19 mm d-1) and 8.2% (0.17 mm d-1), respectively. These findings suggest that local precipitation efficiency is influenced by a complex interplay of synoptic patterns and local atmospheric conditions.