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NOUS41 KWBC 261935
PNSWSH

Technical Implementation Notice 16-28
National Weather Service Headquarters Washington DC
335 PM EDT Mon Jul 25 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:  Transition of the 6km Alaska Forecast Grids from
  Experimental to Operational Status Effective August
  24, 2016

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. Alaska has been issuing these forecast grids
experimentally since 2006.

The technical implementation notice (TIN) announcing the
original six experimental Alaska gridded elements at 6km
resolution is online at:

 www.weather.gov/os/notification/tin06-54ndfd_alaska.txt

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 Documents
(PDD) in the online catalog of NWS products and services.

 https://products.weather.gov/PDD/AK_OperationalNDFD_PDD.pdf

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:

 http://graphical.weather.gov/

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:

ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.a
laska/
and
http://weather.noaa.gov/pub/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/A
R.alaska/

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:

 http://ndfd.weather.gov/technical.htm

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
possible.

For general questions regarding NDFD data, please email:

 nws.ndfd@noaa.gov

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
 David.Ruth@noaa.gov

For questions regarding this notice, please contact:

 Andy Horvitz
 National Weather Service
 Analyze, Forecast and Support Office
 Silver Spring, Maryland 20910
 Andy.Horvitz@noaa.gov

Technical Implementation Notices specifically related to
NDFD are online at:

 http://www.weather.gov/ndfd/tins.htm

National Technical Implementation Notices are online at:

 http://www.weather.gov/os/notif.htm



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