1. Forecast System

 Organization

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

NCEP GFS

Resolution

T126

Vertical (top and type)

L64

0.266 hPa

 3. Real-time forecast Configuration

Is the model coupled to an ocean model

Yes

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

Atmospheric initial conditions

Climate Forecast System Reanalysis (CFSR)

Ocean initial conditions

Climate Forecast System Reanalysis (CFSR)​ 

Forecast range

45 days

Update Forecast frequency

Daily

Ensemble size

16

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

1999-2010

Produced on the fly or fixed?

Fixed

Update Forecast frequency

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

Ensemble size

4

Atmospheric initial conditions

CFSR

Ocean initial conditions

CFSR

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

 https://journals.ametsoc.org/doi/pdf/10.1175/JCLI-D-12-00823.1

Focal point (name/e-mail)

 Wassila Thiaw, Miliaritiana Robjhon, Vadlamani Kumar   wassila.thiaw@noaa.gov, miliaritiana.robjhon@noaa.gov,   vadlamani.kumar@noaa.gov