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Anomaly Correlation Coefficient (ACC)

Anomaly Correlation Coefficient (ACC) Purpose: Quantify the spatial correlation between forecast and observed deviations from climatology. Definition:. Interpretation: Measures pattern similarity, not absolute values

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Anomaly Correlation Coefficient (ACC)

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  1. Anomaly Correlation Coefficient (ACC) Purpose: Quantify the spatial correlation between forecast and observed deviations from climatology Definition: • Interpretation: • Measures pattern similarity, not absolute values • Amplified patterns produce higher ACC skill scores than zonal patterns • Limit of synoptic-scale forecast skill: ACC = 0.6 (subjective) • Source: Miyakoda et al. (1972)

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