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NOUS41 KWBC 261950 CCA

Technical Implementation Notice 16-28: Corrected
National Weather Service Headquarters Washington DC
350 PM EDT Tue Jul 26 2016

To:  Subscribers:
  - NOAA Weather Wire Service
  - Emergency Managers Weather Information Network
  Other NWS partners and NWS employees

From:  Mark Tew
  Chief, Analysis and Mission Support Division

Subject:  Corrected: Transition of the 6km Alaska Forecast
  Grids from Experimental to Operational Status
  Effective August 24, 2016

Corrected to remove reference to original comment request Public
Information Statement (PNS) because it only mentions the
original six experimental National Digital Forecast Database
(NDFD) 6km Alaska Region (AR) forecast grid elements. All
current experimental NDFD 6km AR experimental grid elements will
become operational on August 24, 2016. Also corrected to add a
cross-reference to a new public comment request PNS for
experimental NDFD 3km AR grid elements effective concurrently
with the experimental 6km grid elements transition to
operational status.

Effective Wednesday, August 24, 2016, at 1400 Coordinated
Universal Time (UTC), the experimental National Digital Forecast
Database (NDFD) 6km Alaska Forecast Grids will transition to
operational status.

Concurrently, experimental NDFD 3km AR forecast grid elements
will become available for use and comment.

The gridded elements for Alaska will continue to be available
from NDFD in the standard methods.

More details regarding the 6km operational gridded forecast
elements are available in the Product Description Document (PDD)
in the online catalog of NWS products and services.

With this implementation, these forecasts will be available from
NDFD in the standard methods:

- Gridded Binary version 2 (GRIB2) files via Hypertext Transfer
 Protocol (HTTP) and File Transfer Protocol (FTP)
- eXtensible Markup Language (XML) via Simple Object Access
 Protocol (SOAP)
- Graphics via Web browser

Operational 6km graphics can be accessed at:

Users who pull NDFD elements in GRIB2 format via the Internet
may need to update their procedures and scripts to access these
elements. The 6km operational forecasts GRIB2 files will be
available online at:

Partners and users who use the NDFD in XML via Web service or
the online graphical NDFD images can use the same methods they
currently use to acquire these elements.  More information about
accessing and using NDFD elements is online at:

If August 24, 2016, is a critical weather day, this
implementation may be postponed. Partners and users will be
notified of that decision via a TIN as far in advance as

For general questions regarding NDFD data, please email:

For technical questions regarding NDFD data, please contact:

 David Ruth
 Chief, Digital Forecast Services Branch
 NOAA/NWS Office of Science and Technology Integration
 Silver Spring, Maryland 20910

For questions regarding this notice, please contact:

 Andy Horvitz
 National Weather Service
 Analyze, Forecast and Support Office
 Silver Spring, Maryland 20910

Technical Implementation Notices specifically related to NDFD
are online at:

National Technical Implementation Notices are online at: is the U.S. government's official web portal to all federal, state and local government web resources and services.