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Statement of Guidance for Global Numerical Weather Prediction (NWP)

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Statement of Guidance for Global Numerical Weather Prediction (NWP)


Authors: Erik Andersson, ECMWF


Published: May 2018


Abstract: No abstract, but here are some extracts:

Global Numerical Weather Prediction (NWP) models are used to produce short- and medium-range weather forecasts (out to 10-15 days) of the state of the atmosphere, with a horizontal resolution of typically 10-25 km and a vertical resolution of 10-30 m near the surface increasing to 500 m-1 km in the stratosphere. Ensembles of up to 50 members of such forecasts provide estimates of uncertainty.

Recent developments on coupled forecasting systems indicate the benefits of coupling ocean and sea ice models with the atmosphere for the NWP forecasts. The timely initialization of the sea-ice and ocean therefore needs to be considered. Nowadays the same coupled atmosphere-land-wave-seaice-ocean model is used for the medium and extended range (30-60 days) forecasts. The following sections provide an assessment, for the main variables of interest, of how well the observational requirements are met by existing or planned observing systems.


Link to full paper:

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