The clear air turbulence is one of the atmospheric phenomena that can endanger the health of flight and create restrictions in the flight surveillance. Therefore, considering that Iran is located in the gate of southwest Asia and Eastern Europe, it seems that this study is necessary to predict the occurrence of the clear air turbulence in Iran. To this end, the clear air turbulence indices such as Richardson number, vertical wind shear and Dutton's index are calculated via post processing of outputs of the WRF model. Using GFS data as input to the WRF mesoscale model, prediction of the clear air turbulence is provided for a 24-hour period. Reports of the pilots and aviation maps are also used to validate the predictions.