The Great Lakes Coastal Forecasting System (GLFS/GLCFS) is a real-time coastal prediction system that was developed for forecasting wind-waves, surface water level fluctuations, and horizontal and vertical structure of temperatures and currents in the Great Lakes. It was originally developed as a joint demonstration project by Ohio State University and NOAA's Great Lakes Environmental Research Laboratory. The publicly-accessible version of this system (http://superior.eng.ohio-state.edu) has been operated by OSU since 1994. As a result of the success of the OSU/GLERL demonstration project, GLERL developed a stand-alone workstation version of this system for operational use within NOAA in 1997. The products from this version are intended primarily for use by NWS marine forecasters in the Great Lakes. New developments in this system include incorporation of NCEP 22 km Eta model meteorological forecasts, increased horizontal grid resolution for Lakes Huron and Michigan, improvements to the Web interface including vertical temperature profile plots, and the capability of generating gridded output files for display on NWS AWIPS workstations. We will also discuss validation and future plans for OSU/GLFS and NOAA/GLCFS.