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Regimes and Regime Frequency Histograms for the Extended Range are derived using 4-regime scheme.

Real time example of Extended Range Weather Regime Frequency histogram.

Fig8.2.8-1: The plot shows the cumulative weather regime frequency from the extended range ensembles (DT 14 March 2019).  The coloured bars indicate the number of members forecasting a specific regime for each day of the forecast (Blue:NAO+, Red:Blocking, Green:NAO-, Purple:ATR).  Inclusion of an ensemble member within a regime type gives no indication of the strength of the solution within that type (e.g. a strong or weak Blocking regime).  Members that are not close enough to any of the four weather regimes are represented by the grey bars (members with no regime attribution).  Bars with diagonal lines represent the regime attribution of ensemble mean fields.

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