NOUS41 KWBC 231844



Technical Implementation Notice 15-20

National Weather Service Headquarters Washington DC

245 PM EDT Thu Apr 23 2015


To:       Subscribers:

          -Family of Services

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network


          Other NWS partners and NWS employees


From:     Tim McClung

          Chief Operating Officer

          NWS Office of Science and Technology Integration


Subject:  Distribution of CFS-DNG data via NOAAPORT

          Effective June 16, 2015


Effective June 16, 2015, NWS will add Climate Forecast System,

Downscaled Numerical Guidance (CFS-DNG) temperature and

precipitation data to NOAAPORT. Details are at the site below:


The CFS data being added to NOAAPORT are the following:


- minimum temperature (deg. K) at 2 meters above ground

- maximum temperature (deg. K) at 2 meters above ground

- precipitation rate (kg/m^2/sec)


The data are available for each 6 hour time step from each

forecast run in GRIB2 format. The forecast runs are made four

times each day starting at 00Z, 06Z, 12Z and 18Z. The data will

be available for the entire forecast horizon. The forecast

horizon is variable from 279 days to 308 days; as a result, the

time steps span from hour 0 to between 6696 hrs and 7392 hrs. 

The data are available for the entire globe on a Gaussian grid. 

This grid has a resolution of approximately 0.9375 degrees

longitude and latitude but varies slightly near the poles.


The WMO headers for the CFS products will be as follows:


Min Temperature:   ZTCZ98 KWBF

Max Temperature:   ZTCZ98 KWBF

Total Precip Rate: ZECZ98 KWBF


Note that these WMO headers will be used for all forecast hours. 

Users must use the values in the GRIB Product Definition Template

(PDT) to determine for which forecast hour the data is valid.


Except for the addition of the data described above to NOAAPORT,

there are no changes to current dissemination of CFS output. CFS

output is available on the NCEP server via http and ftp at:



Also, CFS output from the previous 7 days is on NOMADS at:


Users should ensure their decoders are flexible and can

adequately handling changes in content, changes in the scaling

factor component within the product definition section of the

GRIB2 files, and any volume changes which may occur.


For questions concerning the CFS model, please contact:


 Suranjana Saha

 NCEP/Global Climate and Weather Modeling Branch

 College Park, Maryland

 Phone: 301-683-3727



For questions about the flow of this data, please contact:


 Kelly Kempisty

 NCEP/NCO Dataflow Team

 College Park, Maryland

 Phone: 301-683-0567



NWS National Technical Implementation Notices are online at: