NOUS41 KWBC 211850 AAA



Public Information Statement, Comment Request, Amended

National Weather Service Headquarters Washington DC

350 PM EDT Thu Mar 21 2013


To:      Subscribers:

         -Family of Services

         -NOAA Weather Wire Service

         -Emergency Managers Weather Information Network


         Other NWS users and employees


From:    Mark Tew

         Chief, Marine and Coastal Services Branch


Subject: Amended: Experimental Gridded Marine Offshore and High

         Seas Forecasts in the National Digital Forecast

         Database (NDFD) Effective Wednesday March 20, 2013


This notice was amended to additionally notify users NHC will

delete the TAFB experimental gridded marine offshore and high

seas forecasts Web page referenced below when the new NDFD

oceanic grid becomes available for display on the experimental

NDFD map viewer.


Effective Wednesday March 20, 2013, at 1200 Coordinated Universal

time (UTC), the NWS Tropical Analysis and Forecast Branch (TAFB)

will begin providing, on an experimental basis, gridded forecasts

of four marine weather elements over its offshore waters and high

seas forecast areas of responsibility (AOR) in the Atlantic and

Pacific. The grids will be included in NDFD. The Ocean Prediction

Center (OPC) will begin providing offshore grids on May 1, 2013.

OPC high seas forecasts grids are expected to be added during

2014. The Honolulu Weather Forecast Office will provide grids

when necessary hardware improvements are completed later this



The Weather Forecast Offices in Fairbanks, Anchorage and Juneau,

AK, currently provide five variables over their offshore

waters on an experimental basis to the NDFD in the Arctic Ocean,

Bering Sea, and Gulf of Alaska basins.


The TAFB experimental 5-day forecasts of gridded mean sea level

pressure, surface (10-meter) winds, and significant wave heights

on the National Hurricane Center Web page at


will be discontinued when the new NDFD oceanic grid becomes

available for display on the experimental NDFD map viewer.


The gridded marine parameters include surface wind direction and

speed, wind gusts, significant wave heights, and marine hazards.

The Alaska offices also produce a weather grid.


The upper right latitude, longitude for this new oceanic grid is:


79.99N, 10.71E 


The lower left corner lies directly on NCEP grid 204 point, which

coincides with all other Pacific region NDFD grids. The lower

left latitude, longitude for this grid is:


30.42S, 129.91E


Specific information on the grid domain can be found at


Areas of the new offshore grids that coincide with the NDFD CONUS

grid will be included in the CONUS mosaic.


Each offshore and high seas producer will update their grids at

least four times per day.


As of March 20, 2013, experimental marine grids are online at:


More details regarding these elements are available in the

Product Description Document in the online catalog of

Experimental NWS products and services available at:


With this implementation, forecasts for these new zones will be

available from NDFD in the following 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


Graphics for the oceanic grid will be available via the new

experimental NDFD map viewer located at:


Both graphics, and XML via SOAP will become available within 30

days of these grids being produced.


Information on accessing and using NDFD elements is online at:


Comments and feedback on these experimental TAFB Offshore and

High Seas NDFD elements, as well as the OPC Offshore elements,

are welcome at:


GRIB2 users:


Users OF XML SOAP service:


NDFD online graphics:


These new Offshore and High Seas Marine elements will remain

Experimental until NWS assesses feedback and completes a

Technical Analysis.  At that time, the NWS will determine whether

to move these experimental elements to operational status,

discontinue them, or revise and extend the experimental feedback



If March 20, 2013, is declared a Critical Weather Day this

implementation date will be postponed.  Users will be notified of

that decision via another Public Information Statement and a new

implementation date will be established.


If you have questions regarding this notice, please contact:


     David Soroka

     National Marine Program Manager    

     National Weather Service Headquarters

     Silver Spring Maryland 20910



For general questions regarding NDFD data, please email:


For technical questions regarding NDFD data, please contact:


  David Ruth

  Mesoscale Prediction Branch Chief

  NOAA/NWS Office of Science and Technology

  Silver Spring, Maryland



NDFD Public Information Statements are online at:


All National Technical Implementation Notices are online at: