Accession Number : AD0750082

Title :   A Two-Dimensional Short-Range Fog Forecast Model.

Descriptive Note : Research and development technical rept.,

Corporate Author : ARMY ELECTRONICS COMMAND WHITE SANDS MISSILE RANGE N MEX ATMOSPHERIC SCIENCES LAB

Personal Author(s) : Doswell,Charles A. , III

Report Date : MAY 1972

Pagination or Media Count : 76

Abstract : 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)

Descriptors :   (*FOG, *WEATHER FORECASTING), WIND, VORTICES, DIURNAL VARIATIONS, PARTIAL DIFFERENTIAL EQUATIONS, COMPUTER PROGRAMS

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE