An improved computational model and real‐time warning method for windage yaw is proposed based on dynamic air density theory to solve the current problem in Shanxi power grid, whereas the traditional method excludes considerations of microclimate and micro‐terrain effects. The standard value of the air density is replaced by dynamic air density, which takes microclimate factors such as temperature, humidity, and pressure into account. Aiming at the cat‐head type tower, which is most prone to windage yaw in Shanxi province, this paper proposes a method to calculate the minimum air gap. Based on the statistical analysis of meteorological data of Shanxi Province, it is concluded that the microclimate and micro‐terrain factors greatly influence the windage yaw calculation. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.