Implementation of E-suite 4. The model was upgraded to UM7.3
(released 26/3/09). The upgrade from UM6.3 represents 2 major and 5
minor releases of the model and brings the UK 15-day ensemble into line
with its parent system and deterministic forecast system. There are many
changes to the science schemes. RMS errors are improved in all areas
with particular benefit noted in the northern hemisphere in the forecast
range 6-12 days. The stochastic physics schemes SCV an ... more

12-03-2009 MetOffice

Implementation of E-suite 3. The model was upgraded to UM6.3
(released as a portable version 23/7/08). The upgrade from UM6.1 was
primarily the implementation of the new configuration management system,
although code restructuring in several schemes such as radiation and
convection resulted in small improvements to RMS errors particularly in
the tropics.

30-09-2008 ECMWF

The ECMWF model was upgraded to cycle 33r2 on 30th September 2008 12Z. The main changes included in this cycle are:
• The OSTIA (Operational Sea Surface Temperature and Sea Ice Analysis) high-resolution sea surface temperature, produced by the Met Office, and corresponding sea ice analysis (from EUMETSAT Ocea and Sea Ice SAF)
• Conserving interpolation scheme for trajectory fields in 4D-Var
• New variational bias correction (VARBC) bias predictors to allow the correction of infrar ... more

03-06-2008 ECMWF

The ECMWF model was upgraded to cycle 33r1 on 3rd June 2008 12Z. The main changes included in this cycle are:
• Improved moist physics in tangent linear/ adjoint model used in 4D- Var assimilation.
• Re-tuned entrainment in convection scheme.
• Bug fix to scaling of freezing term in convection scheme.
• Additional shear term in diffusion coefficient of vertical diffusion.
• Increased turbulent orographic form drag.
• Fix for soil temperature analysis in areas with 1 ... more

11-03-2008 ECMWF

The ECMWF model was upgraded to cycle 32r3 on 11th March 2008 12Z. The main changes included in this cycle are:
• Integration of the Monthly Forecasting System with the medium-range Ensemble Prediction System (EPS).
• Use of persisted SST anomalies in all atmospheric forecasts
• Daily ocean-coupling of days 10 to 15 of 0000 UTC EPS forecasts
• Monthly Forecast run once per week from 0000 UTC on a Thursday as an extension of the 15 day EPS forecast from this base time
• M ... more

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16-03-2010