Summary of cycle 47r2

Implementation date2021-05-11See News article
Detailed description of changes

Implementation of IFS Cycle 47r2

Key characteristics of our forecasting system

Key characteristics of our forecasting system


Horizontal (unchanged)

  • Atmospheric (unchanged)

    • HRES: O1280
    • ENS (days 1-15): O640
    • ENS extended (days 16-46): O320
  • Wave (unchanged)
    • HRES-WAM: 0.125°
    • ENS-WAM: 0.25°
    • ENS-WAM Extended: 0.5°
  • Ocean (unchanged)
    • NEMO: 0.25°


  • Atmospheric
    • HRES: L137
    • ENS:   L137





  • Ocean (unchanged)
    • NEMO: 75
Data set affected
  • HRES
  • ENS
  • Tropical cyclone track
Score card

The change to single precision is neutral in terms of HRES skill but there are benefits of the increased levels in the ENS. The ensemble score card is overwhelmingly positive and statistically significant (occasional negative changes are small in magnitude.)

Scorecards presenting the new cycle performance are regularly updated: 

Meteorological changesReduction to single precision arithmetic in the HRES and ENS forecasts and increase ENS forecast vertical resolution from 91 to 137 model levels
Meteorological impact
  • Tropical cyclones 
  • ENS vertical profiles
  • Zonal-mean temperature
  • MJO
  • Convective indicators
Technical changes
  • ENS/ENS extended resolution increase from 91 to 137 model levels
  • GRIB encoding
  • BUFR encoding
  • Software
Model ID
  • Atmospheric: 152
  • Ocean wave:  117

New and changed parameters 

  • HRES
  • ENS
  • Tropical Cyclone track
Discontinued disseminated model outputNot applicable 
e-suite experiment number75