Theses and Dissertations

Issuing Body

Mississippi State University


Gutter, Barrett F.

Committee Member

Mercer, Andrew E.

Committee Member

Brown, Michael E.

Date of Degree


Original embargo terms

Visible to MSU only for 2 years

Document Type

Graduate Thesis - Campus Access Only


Professional Meteorology/Climatology

Degree Name

Master of Science


College of Arts and Sciences


Department of Geosciences


The Memphis, Tennessee National Weather Service (NWS) currently has issues with their atmospheric dispersion index (LVORI), and is looking for a new index that better represents smoke dispersion in their County Warning Area (CWA). Forecast soundings at hour 00 and hour 48 from the North American Mesoscale (NAM) model were collected at various locations in the southeastern United States. Using the data collected, a new index equation was developed. A bootstrapping analysis was performed to determine if the mean index number corresponding to low visibility was statistically significantly different and greater than the mean index number corresponding to high visibility for forecast hour 00 and hour 48. Based on the results of this study, the mean index number was greater for low visibility, but was not statistically significantly different for forecast hour 00. For forecast hour 48, the mean index number was greater and statistically significantly different for low visibility.