Experiments are used to evaluate different parameters andparameterization to reproduce a radiation fog that is precededby a strong nocturnal cooling rate. The couple Mellor-Yamadaparameterization and the ration of strength of diffusion coefficients betweenscalars and velocity equal one to provide the better results. The maximum cooling rate was -5.7 ° C / 11h, being higher than the observed -8.8 ° C / 11h.
