1 DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. Numerical Techniques and Cloud-Scale Processes for High-Resolution Models

The long-term goal of this project is to design and evaluate the components that will comprise a next generation mesoscale atmospheric model within the Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS®1). It is anticipated that in order to meet future Navy requirements, next generation approaches to numerical techniques and physical parameterizations will be needed. OBJECTIVES The objectives of this project involve the development, testing, and validation of new numerical tech-niques such as spectral element techniques and monotonic advection methods. The overarching objec-tive is to develop methods for high-resolution numerical weather prediction applications for horizontal grid increments at 1 km or less. APPROACH Our approach is to follow a methodical plan in the development and testing of a nonhydrostatic micro-scale modeling system that will leverage the existing COAMPS and new model prototypes. Our work on numerical methods will involve investigation of spatial and temporal discretization algorithms that are superior to the current generation leap-frog, second-order accurate numerical techniques presently employed in COAMPS and many other models; these new discretization methods will be develope