In this presentation, meteorological observations taken during the Texas AQS 2000 field experiment will be compared with the forecasts of a real-time coupled weather-chemistry forecasting model. This model (Grell et al. 2000) combines a modified version of the fifth-generation Penn State/NCAR Mesoscale Model (MM5, Grell et al. 1994) and the Regional Acid Deposition Model Version 2 (RADM2, Chang et al. 1989) chemical mechanism. The transport of chemical species (grid-scale and sub-grid scale) is treated simultaneously with meteorology. Photolysis, biogenic emissions, and deposition are also calculated "online". The comparison will be carried out in terms of the evolution of sea breeze front and the atmospheric boundary layer structure. The implication of the results from this meteorological comparison in the forecasts of chemical fields will be discussed.