The STEM-2K3 is a regional chemical transport model, with the SAPRC99 mechanism (218 reactions), and all of the 30 photolysis rates are explicitly computed through its on-line TUV. Aerosol Ions are calculated by the on-line four-bin SCAPE II module, developed by CalTech and UC-Irvine. During this compaign, the lateral and top boundary conditions are provided by MOZART-2 global chemical transport model. In this page, we include 4-layer horizontal plots of STEM-2K3 Forecasts. You can also view time-series or cross-section plots over any model grid. There are two high-resolution Forcasts: 12km over Northeastern USA and 4km over New England, nested within this domain. Welcome to send us comments.