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Re-forecasts provide a Seasonal model climate (S-M-climate) against which to compare the actual forecasts.  The re-forecasts for a given system (now SEAS5) are all created before the System comes into operation.  In this sense the re-forecast strategy differs from the update-in-real-time approach used for shorter ranges (ERSUBS-M-climate and M-climate).  The distributions of the seasonal ensemble forecasts can be compared with the corresponding S-M-Climate distributions to give information regarding forecast anomalies.

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