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The Anomaly Correlation Coefficient is the spacial correlation between the forecast anomaly and the verifying analysis anomaly where the anomalies are computed with respect to a model climate (M-climate, ER-M-climate, S-M-climate). Plots show the lead-time that ACC falls to a given skill threshold.
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The score is based on the evaluation of re-forecasts against SYNOP observations. Discrete Ranked Probability Skill Score (RPSS) is the deviation of the forecast values placed within a category against corresponding observations that actually lie within that category (e.g. tercile, quintile, etc.) when compared with model climate (M-climate). The words "discrete" and "ranked" refer to the discrete nature of the ranks or categories.
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ECMWF supplementary headline score
Extreme Forecast Index (EFI) is verified against analysis where an extreme event is taken as an observation exceeding 95th percentile of station climate.
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