Abstract:Based on the NCEP/NCAR data with 6 h time resolution and 25°×25° horizontal resolution, WRF model of 27×27 km horizontal resolution, which has 38 levels in vertical direction and data output per 6 h, is employed to give a seasonal forecasting experiment for TCs in the Pacific Northwest(NWP) basin. According to low-level vorticity, wind speed at 10 meters, sea level pressure, warm core structure and duration , the generation and tracks of the TCs are determined. From July 1 to September 30, the proportions of well simulated typhoons, STSs, TSs and TDs are 4/9, 1/3, 0/1, and 0/1, bad simulations account for 3/9, 1/3, 1/1, 1/1, respectively, while missing report rates are 2/9,1/3,0/1,0/1. And 2 typhoons, 9 STSs and 3TSs are false predicted. The possible reasons for simulated typhoons weaker intensity and declinational tracks are related to the model's resolution, parameter of microphysical processes and integral time. The causes of the false simulated typhoons, STSs and TSs may be explained by the feature of model, integral time, characteristic of the relational sea area and the tropical waves.