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Master's Defense

Department of Atmospheric Science

Thurs., Jul. 27, 11:00 am, EN6085

Orographic Precipitation in Southeastern Wyoming

Nicholas Zelasko

University of Wyoming


This work investigates the spatial and temporal variability of cold-season precipitation within the Medicine Bow Range in Southeastern Wyoming. Applying methods used in Siler et al. (2013), the strength of the rain shadow effect was evaluated. Up to 23% of the variance in precipitation for the Medicine Bow Range can be explained by a climatological rain shadow. Meteorological variables derived from the North American Mesoscale (NAM) Analysis, along with topographic variables, were applied in a stepwise regression to develop statistical equations for precipitation rate at five sites in the Medicine Bow Range. Linear regression equations for four sites are statistically significant (p < 0.05) and between 8% and 31% of the variance is explained. These site-specific regressions do not include elevation as an independent variable. A linear regression equation for the entire Medicine Bow Range explained 18% of the variance in precipitation rate, with elevation, cloud base temperature, and wind direction/orientation being the most influential independent variables.  

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