The Weather Research and Forecasting model (WRF) has been applied for the entire year of 2007 to support future emissions and photochemical modeling applications. It is expected that these meteorological fields will be converted and used to support assessments of ozone, PM2.5, visibility, and a variety of toxics. Charts showing monthly precipitation relative to an areas climatic norm are shown in Appendix A for additional information about regional differences in meteorology in 2007 compared to the weather an area might typically experience. The WRF model was applied to a 36 km continental United States scale domain (36US1) and a 12 km continental United States scale domain (12US1) for the entire year of 2007. Both model simulations were initialized directly from meteorological analysis data. The model parameterizations and options outlined in this document were chosen based on a series of sensitivity runs performed by U.S. Environmental Protection Agency Office of Research and Development that provided an optimal configuration based on temperature, mixing ratio, and wind field. All WRF simulations were done by Computer Sciences Corporation (CSC) under contract from the United States Environmental Protection Agency.

"October 2011". Project Officer: Kirk Baker. Includes bibliographical references. "EPA-454/R-11-007".