The effect of variations in SST on the formation and duration of advection fog event was investigated by carrying out numerical experiments for an advection fog event using a mesoscale coupled model and an uncoupled atmospheric model. Enhanced cooling of the air in the boundary layer over a cooler ocean surface increases the condensation of advected moist air and strengthens the stable stratification. Stable stratification causes a decrease in sea surface wind speed and restricts the downward mixing of drier air