Page History

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• medium range ensemble (ENS):
  • is run twice daily, base times 00 UTC and 12 UTC, producing a 10 day forecast (Day0 to Day10) and also a 15 day forecast (Day0 to Day15). 
  • has horizontal resolution of 9 Km and vertical resolution of 137 model levels.  These values are the same as those of the High Resolution (HRES) in earlier IFS versions.
  • has 50 ensemble members plus a control member (control10 for the
  10day
  • 10 day forecast, control15 for the
  15day
  • 15 day forecast).
  • control10 is the unperturbed ensemble member and corresponds to the High Resolution (HRES) in earlier IFS versions
  and
  • .  The output maintains continuity of output for users.
  the medium
• extended range ensemble:
  • is run
  twice daily from Day0-Day10 and also from Day0-Day15. 
extended range ensemble:
• • once daily, base time 00 UTC, producing a 46 day forecast (Day0 to Day46).
  • has horizontal resolution of 36 Km and vertical resolution of 137 model levels.
  
• •  
  • has 100 members plus a control member.
• the extended range ensemble is run daily from Day0-Day46.
• a multi-layer snow scheme was introduced.

The extended range forecasts are not just an extension of the medium-range forecasts but are completely separate systems both starting from their own analyses.  Two  There are two sets of re-forecasts, one for the medium range and one for the extended range.

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