In 2014, the FAA's Aviation Weather Research Program (AWRP) began funding development of the Offshore Precipitation Capability (OPC). The OPC is a system that creates radar-like mosaic products with the goal of providing offshore situational awareness for Air Traffic Controllers beyond the range of current weather radar. The OPC creates radar-like mosaics by fusing together global lightning data, five GOES satellite channels, and several fields from NOAA's Rapid Refresh (RAP) 13 km numerical weather prediction model. The OPC mosaics are then merged with mosaics from land-based radar to provide a consistent depiction of storms extending offshore. A prototype of OPC that provides offshore coverage for the Miami ARTCC was completed in early 2015. In preparation for transitioning this system into operations, OPC was demonstrated at the 2015 Aviation Weather Testbed Summer Experiment, and also began undergoing third party evaluations by NOAA's Quality Assessment Product Development Team (QAPDT) and the FAA's Aviation Weather Development and Evaluation (AWDE) group. In this talk, we will show highlights of the OPC's development, as well as some results and feedback from these demonstrations and evaluations.