Abstract:Kelamayi has been affected by strong wind for many years,due to its leeward slope location.At present,the Kelamayi Meteorological Bureau has developed a high-resolution numerical prediction system,which can provide reference for strong wind forecast.In order to further improve the prediction effect of the system,a gravity wave drag (GWD) scheme application test has been carried out,schemes are designed.This includes shutting down the GWD in both domains of the model,opening the GWD in the outer domain while shutting down the GWD in the nested domain,and opening the GWD in both the outer and nested domains.The results show that,for the strong wind forecast of Kelamayi,located on the leeward slope,shutting down the GWD in both domains will trigger the downslope winds much earlier than the observation,while opening the GWD in the outer domain will delay the downslope winds to some extent,and opening the GWD in both domains will further delay the downslope winds and minimize the wind speed,so that the results are closer to reality.Although the GWD scheme can effectively improve the time and magnitude of the local gale forecast in Kelamayi City,for the station located on the non-mountain terrain,opening the GWD in the nested domain will yield a certain negative effect.In addition,the statistical results show that opening the GWD in the outer domain can significantly decrease the positive bias of wind forecast and decrease the RMSE,while opening the GWD in both the outside and nested domains will add a negative bias.According to the general verification result,the minimum error and a superior prediction effect can be obtained by turning on the GWD in the outer domain.