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- For medium range forecasts the anomaly correlation coefficient is evaluated between:
- the mean of the anomaly of the forecast product relative to the medium range model climate (M-climate) and
- the mean of the anomaly of the verifying CTRL analysis relative to the medium range model climate (M-climate).
- For extended range products the correlation is evaluated between:
- the mean of the anomaly of the forecast product measured relative to the extended range model climate (ER-M-climate) and
- the mean of the anomaly of the verifying the CTRL analysis relative to the extended range model climate (ER-M-climate).
- For seasonal products the correlation is evaluated between:
- the mean of the anomaly of the forecast product relative to the a model climatology based on the ERA-interim re-analysis (based on the period 1993-2016) and
- the mean of the anomaly of the verifying observations or reanalysis relative to the seasonal model climate (S-M-Climate).
The medium range model climate (M-climate) and extended range model climate (ER-M-climate) are based on re-forecasts spanning the last 20 years, which used the ERA5 reanalysis for their initialisation
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