The Marine Meteorology Division of the Naval Research Laboratory, Monterey, California (NRL MRY) has been engaged in the development and testing of numerical weather prediction systems for over 25 years. In particular, NRL MRY has developed the Navy Operational Global Atmospheric Prediction System (NOGAPS) for 0-6 day global applications, and the Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS? ) for mesoscale, short-term (24-72 hour) applications. In addition to the development and testing, NRL MRY had transitioned these systems to operations at the Fleet Numerical Meteorology and Oceanography Center (FNMOC), and has transitioned a version of COAMPS? for operations at Navy regional centers. NRL MRY is now actively engaged in increasing the performance of these prediction systems. One significant improvement that is nearly complete is the NRL Atmospheric Variational Data Assimilation System (NAVDAS), a 3-dimensional variational analysis that can be applied to both NOGAPS and COAMPS. Research on NOGAPS includes projects to extend the vertical extent of the model to the stratosphere and mesosphere, coupling to ocean and ice models, incorporating advanced numerical methods that allow for significant increases the model resolution, and studies of predictability and targeted observations. Our research on COAMPS includes improvements to the explicit moist physics, initialization of the position and structure of tropical cyclones, implementation of moving nested grids within the context of Message-Passing-Interface (MPI) code, air-ocean coupling, mesoscale validation, incorporation of aerosols, and studies of mountain wave dynamics and fetch-limited and orographic flows. This presentation will provide an overview of the basic components of NOGAPS and COAMPS, examples of their use, the methods used to evaluate their performance, and an outline of the advances planned for these systems.

COAMPS? is a trademark of the Naval Research Laboratory