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The discontinuous and patchy global coverage of conventional climate data (almost totally absent over the oceans and some land areas) means it is unsatisfactory to use conventional climate data to compare with forecast parameters. It is preferable to have system that provides a benchmark to identify extreme or anomalous forecasts events at any chosen location, at any time of year, and at any forecast lead time, and which at the same time can combat any biases and drifts in the IFS models. To this end, a series of re-forecasts are made with resolutions appropriate to each model. These are:
- M-climate for Ensemble 1-15 day forecast period,
- ER-M-climate for Extended Range Ensemble, primarily for the 16-46 day forecast period,
- S-M-climate, primarily for the Seasonal 2-13 month forecast period.
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