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The coupled model configuration is used with:

• the Medium Range ensemble forecast and Ensemble Control Forecast (ex-HRES) forecast (Day 0 to Day 15) twice daily based on 00UTC and 12UTC data.
• the Sub-seasonal range forecast (Day 0 to Day 46) once daily based on 00UTC data. 
• the Seasonal forecast (Month 0 to Month 7 once each month, Month 0 to Month 13 once each quarter) on first day of the month based on 00UTC data.  

More information is given within the Users Guide on the structures of the Global Atmospheric Model, the Ocean Wave Model, and the Dynamic Ocean Model and regarding the the model resolution of the models currently used within the IFS.

Real-time forecasts are initialized from the operational analysis using 4D-Var.  Re-forecasts are initialized from ERA5, except for soil initial conditions (soil temperature, soil moisture, snow initial conditions) which are provided by an offline soil reanalysis.  Oceanic models are initialized from the real-time suite, NEMOVAR.

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