A mesoscale model is used to simulate the diurnal evolution of sea fog off the northeast Scottish coast observed on 27 April 1984. It is shown that the accuracy of the early part of the forecast is very dependent on the specification of the initial conditions. If the initial description of the fog is sufficiently good the model can accurately erode it during the day and reform it in the following evening. The dependence of the accuracy of the forecasts on vertical resolution is also discussed.

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