NOUS41 KWBC 261950



Public Information Statement 16-27

National Weather Service Headquarters Washington DC

350 PM EDT Tue Jul 26 2016


To:       Subscribers:

          - NOAA Weather Wire Service

          - Emergency Managers Weather Information Network

          - NOAAPORT

          Other NWS partners and NWS employees


From:     Mark Tew

          Chief, Analysis and Mission Support Division


Subject:  Solicitation of comments on experimental National

          Digital Forecast database (NDFD) 3km Alaska Region

          (AR) Forecast Grids effective August 24, 2016


Effective August 24, 2016, at 1400 Coordinated Universal Time

(UTC), NWS is accepting comments until October 23, 2016,

regarding the experimental NDFD 3km Alaska Region (AR) Forecast



The new experimental NDFD 3 km AR forecast grids will be made

available concurrent with the experimental NDFD 6km AR grids

becoming operational. For details, see TIN16-28 below:


More details regarding the 3km experimental gridded forecast

grid elements are available in the Product Description Documents

(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:


Experimental 3km 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



The new 3km experimental forecast 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:


Comments on the new experimental 3km grids will be accepted

through October 23, 2016, via electronic survey at the following link:


Feedback will be evaluated and a decision will be made to extend

the comment period, discontinue the experimental 3km grids, or

transition to operational.


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 Technical Implementation Notice

as far in advance as possible.


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


Public Information Statements specifically related to

NDFD are online at:


National Public Information Statements are online at: