Numerical simulations of orographic effects on NE Colorado snowstorms |
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| Authors: | Ms D J Abbs Prof Dr R A Pielke |
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| Institution: | (1) CIRA, Colorado State University, 80523 Ft. Collins, CO, USA;(2) Present address: Department of Atmospheric Science, Colorado State University, 80523 Ft. Collins, CO, USA;(3) Present address: CSIRO Division of Atmospheric Research, 3195 Aspendale, Victoria, Australia |
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| Abstract: | Summary In this paper we show using a three-dimensional mesoscale model that terrain forcing has a major effect on the observed snowfall distribution under upslope conditions in northeast Colorado. Two upslope snowstorms (in 1982 and in 1985) were simulated. The effects are strongly dependent on the orientation of the prevailing wind with respect to terrain orientation.It is suggested that an approach such as discussed in this paper could be used in a forecasting mode, combined with traditional tools such as the NWS Limited Fine Mesh Model (LFM) or Nested Grid Model (NGM). In both of these cases the LFM correctly predicted the development of these storms. However, due to its much coarser resolution it was unable to resolve the terrain-forced variation evident in the simulations presented here.With 15 Figures |
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