OPC Gridded Marine Forecasts
The Ocean Prediction Center's gridded marine forecasts are now available in the National Digital Forecast Database (NDFD).
Gridded forecasts of marine weather elements are available over OPC's North Atlantic and North Pacific areas of responsibility (AOR).
The gridded marine parameters include:
- surface (10-m) wind speeds with direction (KT)
- surface (10-m) wind gusts (KT)
- significant wave heights (FT)
- marine hazards
These elements are available at a spatial resolution of 5 km and a temporal resolution of three (3) hours out to 144 hours or six (6) days.
The grids are produced by forecasters through the AWIPS Graphical Forecast Editor (GFE) and are usually finalized by 0330, 0930, 1530, and 2130 UTC each day.
NDFD posts new day 1-3 grid files 24 times per day. NDFD includes new day 4-7 grid files only for the issuances at 00 UTC, 06 UTC, 12 UTC, 18 UTC, and 22 UTC.
For the oceanic domain, grid files are posted at about 20 minutes past the hour. NDFD adds a new forecast day (24 hours) once per day with the issuance at 22 UTC.
Expired forecast grids are dropped throughout the day.
With this implementation, forecasts for these elements are 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
More details regarding this experimental service are available in the
Product Description Document
from the online catalog of experimental NWS products and services. Please note the National Hurricane Center
was first to distribute gridded marine products so there will be references to NHC in the documentation.
View Graphical Forecasts
The marine forecast images are available via the
experimental NDFD graphical interface.
Select the "Oceanic" option to view wind speed, wind gusts, significant wave heights, and hazards for the National Hurricane Center, Ocean Prediction Center, CONUS, Alaska, Hawaii, and Guam areas of responsibility.
Access Gridded Data
The NDFD oceanic domain covers the Atlantic, Pacific, and Arctic basins for the offices issuing
offshore waters and high seas forecasts. The upper right lat, lon for this grid is: 79.99N,
10.71E. The lower left corner lies directly on an NCEP grid 204 point, which coincides with
all other Pacific region NDFD grids. The lower left lat, lon for this grid is 30.42S, 129.91E.
Specific information on the NDFD grid domains, including the oceanic domain, can be found at
Technical information on accessing and using NDFD elements, including their temporal resolution, can be found
The GRIB2 marine data on the NDFD oceanic domain can be downloaded at the following locations:
Note: Areas of the NDFD oceanic domain that coincide with the NDFD CONUS domain
are included in the CONUS grids as well. Use the NDFD anonymous FTP menu page to access the CONUS and other regional GRIB2 files.
Tools and Utilities
NCEP provides some software utilities for users who need to convert and manipulate GRIB2 datasets. Althuogh they are not supported, they can be downloaded from http://www.nco.ncep.noaa.gov/pmb/codes/GRIB2/
Comments & Feedback
The marine elements will remain experimental until the 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 period.
Comments and feedback on the experimental gridded marine elements are welcome at:
General feedback on NDFD GRIB2 service:
General feedback on NDFD XML SOAP service:
General feedback on the experimental NDFD map viewer: