The purpose of the Regional Ocean Forecast System (ROFS) is to generate daily nowcasts (i.e. analysis) and short-term (on order of days) forecasts of ocean properties for the coastal ocean of the United States. The development of ROFS for the U.S. East coast began in 1991 and was implemented as an experimental real time forecasting system in August, 1993. ROFS is based on a hydrodynamic, three-dimensional ocean circulation model driven driven at the ocean surface boundary by heat, moisture, and momentum fluxes provided by NCEP's Eta mesoscale atmospheric forecast model. [This purpose statement was obtained from the ROFS website at http://polar.wwb.noaa.gov/cofs/ on June 23, 2004.]