To understand the impact of Nanling Mountain Range on numerical weather prediction , the WRF (Weather Research and Forecasting) model is used to simulate one precipitation event that occurred in Chenzhou from October 18 to 20 , 2023 . The comparison between default and changed ( different altitudes and resolutions) terrain data is investigated through numerical sensitivity tests to analyze the impact on near-surface meteorological field simulations . The results show that the special terrain of Nanling Mountain Range is one of the direct causes for the spatial distribution differences in 2 m temperature and 2 m relative humidity in Chenzhou . The mid- and low- level southwest warm and humid airflow is influenced by the blocking and lifting effect , the convergence due to terrain deflection , and the channeling effect of the special terrain of the Nanling Mountain Range . This creates a flow field structure that is favorable for the development and maintenance of convection , facilitating the occurrence of rainfall in this region . Any alteration in the numerical sensitivity tests of terrain , either raising or lowering it , would disrupt this characteristic structure and lead to weakened rainfall and a shift in the position of the rain band . Using higher resolution terrain data can better represent the true terrain characteristics of the Chenzhou , thereby improving the accuracy of model simulation . In a word , the terrain of the Nanling Mountain Range and the changes in the weather field in Chenzhou are closely related . The complex terrain of Nanling is also one of the main reasons for the unique climate features of Chenzhou .