The sequential simulation of atmospheric flows over complex terrain using Computational Fluid Dynamics tools (CFD) leads normally to very large time-consuming runs. With the present day processors only the power available using parallel computers is enough to produce a true prediction using CFD tools, i.e. running the code faster than the evolution of the real weather. In the present work, the ...

We have developed a high level library, the Nearest Neighbor Tool (NNT), to facilitate the coding of finite difference approximation weather prediction models on parallel computers. NNT provides portability and ease of programming and at the same time optimizes performance by allowing the overlap of computation and communication to tolerate the latency of remote data moves. In this paper we des...

In this paper we present a methodology followed to parallelize a weather forecasting code running operationally on a small Network of Workstations with real data sets. The 1D Eta/NMC model code was originally written in Fortran 77 and optimized for vector supercomputers. We describe the steps followed to parallelize the Eta/NMC-dust code. The examination of program workload gave important insig...

In order to drastically shorten the runtime of the weather-prediction code ASUCA , developed by the JMA (Japan Meteorological Agency) for the purpose of the next-generation weather forecasting service, the entire parts of the huge code were rewritten for GPU computing from scratch. By introducing many optimization techniques and several new algorithms, very high performance of 145 TFlops has be...

This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The United States Government assumes no liability for its contents or use thereof. Providing an accurate picture of the weather conditions in the pilot's area ofinterest is a highly useful application for ground-ta-air datalinks. The problem with using data links to t...

In this paper, we present the Ctadel system, a Code-generation Tool for Applications based on Diierential Equations using a very high level Language speciication. The Ctadel system generates eecient and vectorizable Fortran 77 code automatically from a very high level language description of a model described by partial diierential equations (PDEs). The system combines algebraic simpliication a...

It has been demonstrated through simulations that the SZ phase code method of mitigating range ambiguities has a performance that exceeds any other known phase-coding scheme. This paper describes an implementation of this code on a weather radar and compares its performance with that derived from simulations. Spectral data obtained from NCAR’s S-Pol radar, which had its transmitted phases coded...