Description of the upgrade
Model cycle 15r7 was introduced in both the T213 L31 10-day forecast and the EPS
The main features of the new cycle are:
a two-time level semi-Langrangian scheme
advection cloud variables
changes in the snow albedo, expected to reduce the cold bias in 2m temperature in spring
change to the humidity analysis to eliminate unrealistic drying of the extra-tropical lower stratosphere
change to the use of SSM/1 sea ice data to eliminate erroneous sea points over permanent ice
minor change to the model orography and slight adjustments to other fixed surface fields.
Implemented:
10 December 1996
All forecast scorecards
Forecast User Guide
All IFS Documentation