Climate change has profoundly altered North America's fire regime by intensifying temperatures, extending drought periods, and shifting precipitation patterns. While wildfire emissions and chemical compositions are increasingly well characterized, significant uncertainty remains in estimating their regional radiative impacts — particularly due to the limited or absent representation of brown carbon (BrC), an important light-absorbing component of biomass burning aerosols, in many atmospheric models. This study focuses on the August 2019 Williams Flats fire in Washington State, using the High-Resolution Rapid Refresh model coupled with chemistry (HRRR-Chem) to quantify the direct radiative effects of wildfire-generated aerosols. By incorporating brown carbon and its light absorption properties into HRRR-Chem, the research enhances the model’s ability to simulate wildfire aerosol impacts on regional radiative forcing. The findings highlight improved representation of brown carbon optical properties, offer more accurate quantification of wildfire-induced radiative changes, and contribute to a better understanding of fire-climate feedback mechanisms.