Numerical weather prediction (NWP). The Arpege project at meteo-france. The global numerical weather prediction model ARPEGE (Action de Recherche Petite Echelle Grande Echelle) is an essential tool for operational weather forecasting at Météo France. This system is fully integrated within the ARPEGE-IFS software that was conceived, developed and maintained in collaboration with ECMWF. This software possess most applications that are necessary for operational numerical predictions which ensures full consistency between computations performed during the analysis, the model and the post-processing steps. As a new version is implemented every nine months or so, the code is continuously evolving to get the best out of the supercomputers, to assimilate data from new observation systems and to improve the components of the forecast model. The lifespan of the ARPEGE model goes well beyond any of its predecessors, being in use for more than 23 years now, against the old record of 8 years and 7 months for the Péridot model.

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