Cycle 32r3V summary of changes

Implementation date

11 March 2008


Key characteristics of our current forecasting system  

Horizontal  (unchanged)

  • Atmospheric
    • HRES: TL799
    • ENS: Leg A TL399
  • Wave
    • HRES: 0.25 degrees
    • ENS: 0.5 degrees
    • LAW: 0.1 degrees

Vertical (unchanged)

  • Atmospheric
    • HRES: L91
    • ENS: L62
Data set affected
  • HRES
  • ENS
Scorecard -
Meteorological changes
  • Use of persisted SST anomalies in all atmospheric forecasts
  • Daily ocean-coupling of days 10 to 15 of 0000 UTC ENS forecasts
  • Modified EFI products using the new unified re-forecasts
Meteorological impacts Previously, the sea surface temperatures were persisted from the initial conditions during both the deterministic and the medium-range ENS forecasts. With the implementation of the unified VarEPS monthly system, the sea surface temperature anomalies relative to the 1979-2001 ERA-40 daily climates are persisted. The anomalies are added to the ERA-40 daily climate to produce the full SST field.
Technical changes
  • Monthly Forecast run once per week from 0000 UTC on a Thursday as an extension of the 15 day ENS forecast from this base time 
  • New GRIB description for all Monthly Forecast products, analogous to the current medium-range ENS data
Model ID
  • Atmospheric: 131
  • Ocean wave: 116
  • Limited-area ocean wave: 216
New disseminated model output -  
Discontinued disseminated model output -  
e-suite experiment number