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The ensemble forecast suite (ENS) forecasts provide a range of possible future weather states in the medium range.  It 

The ensemble forecast suite runs daily from base times 00 UTC and 12 UTC out to day 15.  It has horizontal resolution of 9 km, 137 model levels in the vertical and has and-atmosphere and ocean-atmosphere coupling.  The ensemble consists of one unperturbed member (the control) and 50 perturbed members 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 medium range re-forecasts provide a basis for M-Climate.

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