Based on conventional observations and the NCEP reanalysis data, the heavy rainfall in eastern part of northeast China caused by typhoon Chan-hom (2015), which made landfall at Korean peninsula and moved northward and then encountered with cold air, was studied in the paper.The results suggested that the rainstorm occurred during the interaction with mid-latitude trough and the circulation of typhoon undergoing extratropical transition process as well as cold air.Meanwhile, the landfalling typhoon weakened slowly due to the merge with mid-latitude low on the surface.The cold air invaded low-level atmosphere in the north of the typhoon and enhanced low-level convergence and high-level divergence, which resulted in strong upward motion as an important heavy precipitation formation dynamical factor and so heavy rainfall therein.The evolution of precipitation indicated the event formed because of long time duration of moderate rainfall, which may related with low-level cold air intrusion, which only enhanced the lifting not the instability in the atmosphere.Water vapor provided for the rainstorm mainly came from the typhoon itself and those transfer from Japan Sea.In addition, the topography also played an important role on the vertical motion and water vapor transfer.
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