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The generation of the sub-seasonal forecast signal is reflective of this and was designed to deliver a simple to understand categorical information on the anomalies and uncertainties present in the forecast, relative to the underlying weekly-mean-discharge-based climatology. The methodology to compute the anomaly and uncertainty information for the weekly mean sub-seasonal ensemble forecast is described here: Placeholder Forecast anomaly and uncertainty computation methodology. This is page is generic and describes the procedure for any river pixel and either one of the sub-seasonal or seasonal systems.