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Taking account of solutions from ECMWF and other models - Grand Ensembles

An ensemble of NWP model runs using different models but starting from the same data time is known as a grand ensemble.  Combining the current ensembles from different models into a larger ensemble (as in Fig6.1.1.1-1) can show consistency or divergence in forecasts.  They can also show alternative solutions.  Nevertheless, there can be some agreement between the spread and jumpiness. 

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