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The extended range forecast suite runs daily from base times 00 UTC out to day 46. It has horizontal resolution of 36 km, 137 model levels in the vertical and has land-atmosphere and ocean-atmosphere coupling. The ensemble consists of one unperturbed member (the control) and 100 perturbed members with that are similar to the control but their initial states and model physics have been perturbed to explore the currently understood range of uncertainty in the observations and the model. A set of extended range re-forecasts provide a basis for ER-M-Climate. The extended range forecast suite is not an extension of the medium-range forecasts but is a completely separate system.
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