Abstract: Atmospheric duct environment changes the normal path of electromagnetic wave propagation, affects the detection of radar and causes the electromagnetic shadow zone of radar. In this paper, we establish two coupling numerical forecasting models to solve the problems on forecasting the radar shadow zone, based on the mesoscale numerical prediction model and the electromagnetic wave propagation mechanism in atmospheric duct environment. The coupling model A is used to predict the top hole in the evaporation duct, the coupling model B is to predict the skip zone in the surface duct. It is concluded that the coupling models are effective to predicting the radar shadow zone.

Key words: electromagnetic shadow zone, top hole, skip zone