Cycle 37r3 Summary of Changes

Implementation date               

15 November 2011 See news article
Detailed description of changes  
Key characteristics of our current forecasting system  


Horizontal (unchanged)

  • Atmospheric
    • HRES: TL1279
    • ENS: Leg A T639, Leg B T319, Leg C T255
  • Wave
    • HRES: 0.25 degrees
    • ENS: 0.5 degrees




  • Atmospheric
    • HRES: L91
    • ENS: L62


Data set affected

Score card Comparison of scores of model cycle
Meteorological changes


  • Modification of the entrainment/detrainment of convection
  • Modification of the supersaturation and deposition rate for clouds
  • Modification of the surface roughness
  • Bias correction of aircraft temperature observations
  • Cycling of stratospheric model error (for the weak-constraint 4D-Var)
  • Assimilation of accumulated rainfall from NEXRAD radar data from the United States
  • Assimilation of ozone observations from infrared radiances
  • Use of the latest version of the NWP-SAF radiative transfer model (RTTOV-10 including FASTEM-4)
  • Retuning of cloud detection for the advanced infrared sounder data
Meteorological impacts
  • Impact on upper-air scores in the early forecast range in both hemispheres
  • Impact on geopotential scores
  • Lower tropical wind scores
  • Impact on the EPS is improved
Technical changes -
Model ID 37r3
New disseminated model output


Discontinued disseminated model output None
e-suite experiment number 0055