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Model Description

The information of 5 models participating in APCC BSISO forecast is listed below. The information can be changed if the corresponding operational model is modified.

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  1. Forecast System


USA, National Centers for Environmental Prediction 

 System name

CFS (Climate Forecast System)  

 First operational forecast run from APCC

July, 2013

  2. Model Description

Atmospheric model





Vertical (top and type)


0.266 hPa

 3. Real-time forecast Configuration

Is the model coupled to an ocean model


If yes, please describe ocean model briefly including name of model, frequency of coupling, and any ensemble perturbation applied :

The oceanic component (MOM4) uses a zonal resolution of 0.5° and a meridional resolution of 0.25° between 10o S to 10o N, gradually increasing through the tropics until becoming fixed at 0.5° poleward of 30°S and 30°N, 40 vertical levels. Coupling frequency is 10 minutes between atmosphere and sea ice and 1 hour between atmosphere and ocean

Atmospheric initial conditions

Climate Forecast System Reanalysis (CFSR)

Ocean initial conditions

Climate Forecast System Reanalysis (CFSR)​ 

Forecast range

45 days

Update Forecast frequency


Ensemble size


How is the ensemble configured?

Initial conditions for ensemble members are created by adding small fractions (about 5%) of the differences between the initial date and previous days to CFSR analysis for atmospheric and oceanic prognostic variables.

 4. Hindcast Configuration

Hindcast Period


Produced on the fly or fixed?


Update Forecast frequency

Every day starting from 1 January of each year for the period 1999- 2010.

Ensemble size


Atmospheric initial conditions


Ocean initial conditions


Is the ensemble generation the same as for real-time forecast? If not, please describe the difference : 

 The 4 daily ensemble members were initialized directly from CFSR analysis every 6 hours from 00z, 06z, 12z, and 18z. 

 5. More information

Main reference or URL

Focal point (name/e-mail)

 Wassila Thiaw, Miliaritiana Robjhon, Vadlamani Kumar,,

CFS : National Centers for Environmental Prediction - Climate Forecast System
GFS : National Centers for Environmental Prediction - Global Forecast System​
ECM : European Center for Medium Range Weather Forecasts - Ensemble Prediction System
CWB : Taiwan's Central Weather Bureau - Taiwan CWB 1-tier Global Atmosphere-Ocean Coupled Forecast System 
BOM : Australian Bureau of Meteorology - Australian Community Climate and Earth-System Simulator Seasonal 1