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Creation of SUBS-M-Climate
The SUBS-M-Climate is derived from a set of sub-seasonal range re-forecasts created using the same calendar start dates over several years for data times either side of the time of the sub-seasonal ensemble run itself. The re-forecast runs are at the same resolution as the sub-seasonal medium range run itself and run over the 46-day sub-seasonal range ENS period.
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- sub-seasonal range forecast verification metrics are based on the re-forecasts.
- re-forecasts allow computation of the SUBS-M-climate which allows actual forecasts to be converted into an anomaly format. Forecasts in terms of anomalies relative to a model climate (rather than relative to the observed climatology) mean that some calibration for model bias and drift into the products is incorporated.
Selection of sub-seasonal range re-forecasts
The set of re-forecasts is made up from:
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- to present the day15 to day46 ensemble meteograms with the sub-seasonal range climate (SUBS-M-climate).
- to highlight significant anomalies of forecast 2m temperature, wind speed, cloudiness and precipitation from the norm for a given location and time of year.
Different reference periods for M-Climate and SUBS-M-Climate
ECMWF uses different reference periods but essentially the same re-forecast runs to build the M-Climate and the SUBS-M-Climate. The key difference is that those runs are grouped and used in different ways:
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