Atmospheric releases of hazardous materials, either accidental or intentional, pose a viable threat to both United States citizens, as well as to citizens and troops abroad.  To counter this threat, RAL is actively researching and developing novel techniques and systems that can more accurately simulate the atmospheric state and evolution of the released material in both time and space. The capability to model and visualize source dispersion and the effects is critical for planning, real-time response, and forensic purposes.