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• Weather scenario clustering is performed on medium range ensemble output over a restricted area covering Europe and the northwest Atlantic.  It highlights the differences between medium range scenarios in terms of the large-scale flow.  
• Weather regime clustering summaries are based on one of four climatological regimes which have been derived from reanalysed data over a rather larger area covering Europe and the north Atlantic. It also provides information about the possible transitions between regimes during the forecast.

Clustering is a compromise between the advantage of condensing a large amount of ensemble output against the disadvantage of losing possibly important information.   A convenient overview of ensemble members forecast information can be gained from using:

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