Abstract:Based on the tropical cyclone best track dataset from the China Meteorological Administration Tropical Cyclone Data Center and the monthly reanalysis data from the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR), this paper analyzes the northward moving tropical cyclones (TC) that affect Shandong and the extreme precipitation caused by them, also reveals the atmospheric circulation characteristics that are favorable for TCs to move northward and influence Shandong. The results show that the TCs affecting Shandong mainly occur from June to September, with the greatest impact in midsummer (July and August). When TCs affect Shandong, their intensity levels are mainly typhoon or below, or extratropical transition occured. These TCs can cause extreme precipitation events in Shandong, most of which occur in summer and autumn (July-September), with the largest proportion in August and the second in September. The proportion of extreme precipitation events caused by TCs is about 10% of total, but its interannual variation is large, reaching more than 60% in some years. Especially, the contribution of TC to extreme precipitations in Shandong has significantly increased since 1990. The TCs affecting Shandong are mainly generated in the northwest Pacific, and most of them have a turning path. When there is a positive phase of the Pacific-Japan (PJ) teleconnection pattern at 500 hPa geopotential height anomaly field, TC is more likely to move northward and affect Shandong. At this time, the position of the northwest Pacific subtropical high is northward, while the airflow on its southwest edge can lead TC to move northward, affecting east China. It is conducive to the generation and development of TC when there are abnormal cyclonic circulations over the South China Sea and the northwest Pacific at 850 hPa, with active convection and enhanced summer monsoon circulation and monsoon trough. Moreover, the abnormal ascending motion, increased vorticity, reduced vertical wind shear, and abundant water vapor over east and south China are conducive to maintaining the strength of TC after landing.