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The M-Climate is derived from a set of medium range re-forecasts created using the same calendar start dates over several years for data times either side of the time of the extended ensemble run itself. The re-forecast runs are at the same resolution as the medium range run itself (currently 9km?) and run over the 15-day medium range ensemble period.
Medium range re-forecasts for verification
There is merit in examining the real-time performance of a forecasting system. But the sample sizes created for one system are far too small to conclude anything about its true performance levels. Re-forecasts are used to increase the available data to produce a model climate. The results of forecast system may be compared with this model climate.
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