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Examples of NAO–BLO phase space diagrams.

Fig8.2.7-3:  Regime Projection Diagrams: NAO/BL phase space diagrams (Wheeler-Hendon diagrams) for the periods: Days11-17 and Days25-31, from extended range ensembles DT 20 Oct 2023.  Colours represent the proportion of members that have a similar mean solution during each seven day period.  The shaded area gives an indication of the spread of regime types.  Colours represent different proportions (taken as probabilities) of a combination of regime types. Note the colours represent different probabilities on each diagram.  Within the central circle there is only a weak indication of regime type.  The regime Projection Diagrams are derived using Mirror 2-regime scheme.

NAO–BLO phase space can be used to illustrate the relationship between severe cold European spells. 

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