Page History

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• medium range ensemble (ENS):
  • is run twice daily, base four times daily:
    • base times 00 UTC and 12 UTC, producing a 10 day forecast (
    Day0 to Day10
    • T+0 to T+240) and also a 15 day forecast (T+0 to T+360).
    • base times 06UTC and 18UTC, producing a 6 day forecast (
    Day0 to Day15). 
    • T+0 to T+144). 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 the High Resolution (HRES) in earlier IFS versions.
  • has 50 ensemble members plus an unperturbed control member (CTRL).
  • The the unperturbed control member (CTRL) corresponds to the High Resolution (HRES) in earlier IFS versions.  CTRL forecasts maintain continuity of output for users.
  • documentation gives details of products and dissemination schedules.
• 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.
  • documentation gives details of products and dissemination schedules.
• a multi-layer snow scheme was introduced.

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