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Every forecasting system that contributes to C3S will have a different lifetime, so different versions of the systems are expected to be upgraded by their original institutions. For the real-time forecasts just one version of each one of the contributors will be made available to C3S at a given time. For instance, in November 2017 ECMWF changed its operational seasonal forecast system from system 4 to SEAS5, but both systems were kept running in parallel at ECMWF for a while. However, the only version of ECMWF seasonal forecasts available at C3S from November 2017 onwards is from SEAS5.
How do seasonal forecasting systems build their ensembles? And how are data
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produced?
"Burst" vs. "lagged" mode
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