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NOUS41 KWBC 231941

Technical Implementation Notice 15-20
National Weather Service Headquarters Washington DC
342 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:

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