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The medium range ensemble (ENS):

• • is run four times daily:
    • Day0 to Day15 based on 00UTC and 12UTC data
    • Day0 to Day6 based on 06UTC and 18UTC data.Results from these runs are:
      • used in Early cut off analysis (SCDA) and Long window data analysis (LWDA).
      • disseminated T+0 to T+72
  • has horizontal resolution of 9 Km and vertical resolution of 137 model levels.  These values are the same as those of HRES (High Resolution in Cy48 and earlier).
  • has land-atmosphere and ocean-atmosphere coupling.
  • has 50 ensemble members plus an unperturbed ensemble control member.
  • the Ensemble Control Forecast (ex-HRES) output runs on the schedule of HRES in Cy48 and earlier.   It runs before the medium range ensemble starts.  It is labelled HRES for the convenience of users but the name will be withdrawn in a future update cycle.
  • the Ensemble Control Forecast (ex-HRES) output runs on the schedule of HRES in Cy48 and earlier.   It runs before the medium range ensemble starts.  It is labelled HRES for the convenience of users but the name will be withdrawn in a future update cycle.
  • the dissemination schedule is given in Section 3.1:

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• • • Ensemble Control Forecast (ex-HRES)

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• • • schedules and products.
    • Medium range schedules and products.  

The ensemble consists of one unperturbed control member and 50 perturbed members.  These are similar to the control member but differ only that initial states and model physics have been perturbed.  This allows exploration of the currently understood range of uncertainty in the observations and the model.   A set of medium range re-forecasts provide a basis for the medium range model climate (M-Climate).

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