The temporal variability in Prince William Sound surface current patterns occurs over interannual, seasonal, synoptic, and tidal time sales and the variability associated with these circulation patterns is significant. Yet the variability has been under sampled in both time and space. This study will use newly available High Frequency radar technology to measure and analyze the surface currents of the Sound and provide the first comprehensive study of surface circulation patterns. This technology will be used to provide hourly maps with special resolutions of approximately 2 km. The project will also investigate the relationship of the surface current patterns to wind forcing, flow through Hinchinbrook Entrance and Montague Strait, and tides. Surface current maps will be considered for trajectory analysis in oil spill contingency planning and for use in search and rescue scenarios.