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 an unperturbed control member (CONTROL-10 for the 10 day forecast, CONTROL-15 for the 15 day forecast.CTRL).
  • The unperturbed control member (CTRL) CONTROL-10 corresponds to the High Resolution (HRES) in earlier IFS versions.  CONTROL-10  CTRL forecasts maintain continuity of output for users.
• extended range ensemble:
  • is run 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 an unperturbed control member.
• a multi-layer snow scheme was introduced.

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• High Resolution (HRES):
  • had horizontal resolution of 9 Km and vertical resolution of 137 model levels (HRES not used after Cy48r1).
• medium range ensemble (ENS):
  • had horizontal resolution of 18 Km and vertical resolution of 137 model levels (higher horizontal resolution after Cy48r1).
  • had 50 ensemble members plus a control member.
  • the medium range ensemble was run twice daily from Day0-Day15.  
• extended range ensemble:
  • had horizontal resolution of 36 Km and vertical resolution of 91 model levels (higher vertical resolution after Cy48r1).  
  • had 50 members plus a control member (doubled the number of ensemble members after Cy48r1).
  • the extended range ensemble wais run daily from Day0-Day46.
• a single-layer snow scheme was used.

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