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The extended-range impact of model changes associated with 46r1 is neutral, except for a small degradation of 2-metre temperature and precipitation skill scores in the tropics. However, the use of ERA5 instead of ERA-Interim as initial condition gives significant iwave_p2ww.gribmprovements improvements in weeks 1-2 in the extratropics, and up to week 4 in the tropics.
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