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Non-systematic synoptic errors can be dampened by different ensemble approaches (e.g. ENS alone, ENS and HRES, probability considerations, forecast error growth).  However, sub-grid variability (notably for rainfall but other parameters too) can be addressed through downscaling.  Downscaling converts the grid box area average probability density functions from the raw ENS into "point rainfall probability density functions" for points within each grid box.

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