Applications of the Clark Model to Winter Storms over the Wasatch Plateau

James A Heimbach, Jr., William D Hall

Abstract


The configuration of the Clark mesoscale model to a field experiment conducted over the central Utah Wasatch Plateau experimental area is briefly described.  Its application is demonstrated using one case from the early winter 1991 Utah/NOAA Cooperative Atmospheric Modification Research Program.  Observations of sulfur hexaflouride and ice nuclei were used to test the model.  The results were in reasonable agreement with field measurements of plume positiions; however, plume concentrations were underpredicted.  The model was run with a Kessler warm rain parameterization to examine the characteristics of liquid condensate.  Patterns of liquid water predicted by the model suggest that depletion of liquid water of the lee of the crest could be due to subsidence warming.  This compicates the estimation of liquid water depletion through precipitation processes.

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