The NOAA National Center for Tsunami Research is collaborating with National Weather Service Tsunami Warning Centers and academia to develop a tsunami forecasting system that assimilates real-time event data with numerical models to provide estimates of tsunami amplitudes and arrival times for potential at-risk communities. The design and implementation of this operational system is based on a Service Oriented Architecture (SOA) model. Design constraints include multiple operating system deployment, Windows XP, Linux, and MacOS X, real-time response to external inputs, and the stability and robustness necessary for an operational setting. The system is implemented using the Java JDK 5.0 language and Jini/JavaSpaces for the SOA framework.