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Form of Output

ECMWF provides data from several different IFS models, with different frequencies each available according to when the IFS models are run, and each with different temporal resolutions in the output data.

Output data is in the form:

• most commonly as absolute values:  
  • instantaneous values,
  • averages over a period,
  • totals over a period,  
  • maxima or minima over a period.
• sometimes as:
  • anomalies relative to re-forecast data
  • an assessment of how extreme the anomalies might be (Extreme Forecast Index and Shift of Tails).

Medium Range forecasts

Daily runs based 00UTC and 12UTC data time are available for the following forecast times:

• medium range (10-day) HRES* & HRES*-WAM) Control10 and Control10-WAM analysis CONTROL-10 and CONTROL10-WAM analysis and forecasts based on 00UTC and 12UTC: hourly up to T+90, 3-hourly from T+93 to T+144, 6-hourly from T+150 to T+240.
• (medium range (15-day) ENS & ENS-WAM ) analysis and forecasts based on 00UTC 3 hourly up to T+144, 6-hourly from T+150 to T+360. ???????

For Members of the Boundary Conditions (BC) optional programme (members using ECMWF IFS model forecast values as boundary conditions for their own local areas models) Medium Range forecasts based on 06UTC and 18UTC data times are available for the following forecast times:

• medium range (10-day) HRES* & HRES*-WAM) Control10 and Control10CONTROL-10 and CONTROL10-WAM analysis and forecast based on 06UTC and 18UTC:  hourly up to T+90, 3-hourly from T+93 to T+144

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