A Two-Dimensional Short-Range Fog Forecast Model.
Research and development technical rept.,
ARMY ELECTRONICS COMMAND WHITE SANDS MISSILE RANGE N MEX ATMOSPHERIC SCIENCES LAB
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RSAL, FORTRAN, FORTRAN 5 PROGRAMMING LANGUAGEA two-dimensional dynamical model is developed for the specific purpose of forecasting fog for time periods of as much as eight hours on a local scale. Time-dependent winds are generated by calculating a streamfunction from a model-produced vorticity field. A diurnal variation at the surface is simulated by sinusoidally varying boundary conditions on temperature. Surface terrain effects can be incorporated through boundary conditions to provide a means of adapting the method to a particular location. Only grosser features of microphysical processes have been incorporated, and the values of the wind forecasts are limited by the inability of a two-dimensional model in the X-Z plane to include synoptic-scale variations. Fine-scale data are required for the model, which is thereby well-suited to provide forecast support for such activities as fog modification experiments. Author