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Taking account of previous ECMWF ENS solutions - Lagged Ensembles

An ensemble of NWP model runs starting from different data times is known as a lagged ensemble.   A combination of current and recent ensembles into a larger ensemble (as Fig6.1.1.2-1) 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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