Throughout a year-long planning effort, NOAA Air Resources Laboratory (ARL) has been supporting public safety and emergency management committees across the San Francisco Bay Area in preparations for tomorrow’s big game. HYSPLIT is an ARL model that can forecast the trajectory of airborne hazardous materials. Using meteorological data, the model computes the most likely path of travel from a starting point and can forecast concentrations of the airborne material and how it might settle to the gr