The Weather Research and Forecast (WRF) project is a multi-year/multi-institution collaboration to develop a next generation regional forecast model and data assimilation system for operational numerical weather prediction (NWP) and atmospheric research. Under this project – a collaboration between The National Center for Atmospheric Research (NCAR), Microsoft Corporation, Advanced Micro Devices, Inc., and The Portland Group, Inc (PGI) – a prototype version of WRF has been developed and demonstrated running in parallel using MPI on an AMD Opteron™ dual-core processor based server running Windows Compute Cluster Server 2003, Microsoft Compute Cluster Pack,. This preliminary report describes progress and issues encountered in porting WRF to an HPC cluster running Windows, using Microsoft Subsystem for UNIX-based Applications (SUA) and the PGI Fortran compiler.

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