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NOUS41 KWBC 081935
PNSWSH

Technical Implementation Notice 14-26 Amended
National Ocean Service Headquarters Washington DC
Relayed by National Weather Service Washington DC
335 PM EDT Tue Jul 8 2014

To:  Subscribers:
  -Family of Services
  -NOAA Weather Wire Service
  -Emergency Managers Weather Information Network
  -NOAAPORT
  Other NWS and NOS partners and employees

From:  Pat Burke
  Acting Chief, Oceanographic Division
  NOS Center for Operational Oceanographic Products
            and Services (CO-OPS)

Subject:  Amended: Implementation of new NOS Oceanographic
          Forecast Modeling System for the Northeast Gulf of
          Mexico and the Northwest Gulf of Mexico,
          Effective September 16, 2014

Amended to change effective date to September 16

Effective September 16, beginning at 15z Coordinated Universal
Time (UTC), 1000 AM EST, the NOS Northeast Gulf of Mexico
Operational Forecast System (NEGOFS) and Northwest Gulf of Mexico
Operational Forecast System (NWGOFS) will be implemented on the
NOAA Weather Climate Operational Supercomputing System (WCOSS)
operated by NCEP Central Operations (NCO).

NEGOFS and NWGOFS are two nested operational forecast systems of
the existing operational forecast system for the Gulf of Mexico
(NGOFS). These systems now will provide users with higher-
resolution nowcasts (analyses of near present) and forecast
guidance of the three-dimensional physical conditions of Gulf of
Mexico northeast and northwest coastal waters, including surface
water levels and 3-D water currents, water temperature, and
salinity out to 48 hours.

As its core ocean prediction model, NEGOFS and NWGOFS use the
Finite Volume Coastal Ocean Model (FVCOM) developed jointly by
the University of Massachusetts, Dartmouth, and the Woods Hole
Oceanographic Institution. FVCOM is a prognostic, unstructured-
grid, finite-volume, free-surface, 3-D primitive equation coastal
ocean model. FVCOM has a horizontal grid comprised of
unstructured triangular cells where the irregular bottom is
presented using generalized terrain-following coordinates.

The NEGOFS grid consists of 68,455 nodes and 130,814 elements and
includes three PORTS: Gulfport, Pascagoula and Mobile Bay. The
grid resolution ranges from 45m to 2160m. NEGOFS has resolution
from 56m to 986m in Gulfport, 45m to 1050m in Pascagoula, and 45m
to 1500m in Mobile Bay. The NWGOFS grid consists of 85,707 nodes
and 161,518 elements and includes four PORTS: Matagorda Bay,
Galveston Bay, Sabine Neches and Lake Charles. The NWGOFS grid
resolution ranges from 60m to 3500m, 70m to 550m in Matagorda
Bay, 80m to 530m in Galveston Bay, 60m to 540m in Sabine Neches
and 70m to 560m in Lake Charles. The higher resolution within the
seven PORTS provides more detailed current features.

NEGOFS and NWGOFS operate within the NOS Coastal Ocean Modeling
Framework (COMF) and have four daily nowcast and forecast cycles:
03, 09, 15 and 21 UTC.

For the NEGOFS or NWGOFS nowcast cycle, the meteorological
forcing is provided by the nested, high resolution (4 km) NCEP
North American Mesoscale (NAM) weather prediction model. River
discharge and stage are estimated using near-real-time
observations from U.S. Geological Survey river gauges.
Oceanographic conditions of water levels, currents, water
temperature and salinity on lateral open boundary on the shelf
are provided from NGOFS nowcast simulation.

For the NEGOFS or NWGOFS forecast cycle, the meteorological
forcing is provided by the nested, high resolution (4 km) NCEP
North American Mesoscale (NAM) weather prediction model. River
discharge and stage are estimated by persistence of the most
recent near-real-time observations from U.S. Geological Survey
river gauges. Oceanographic conditions of water levels, currents,
water temperature and salinity on lateral open boundary on the
shelf are provided from NGOFS forecast simulation.

Gridded and point forecast guidance from NEGOFS or NWGOFS will be
available in netCDF files on the NCEP server at Web Operations
Centers (WOC)

ftpprd.ncep.noaa.gov

in the directory
/pub/data/nccfs/com/nos/prod/negofs.yyyymmdd
/pub/data/nccfs/com/nos/prod/nwgofs.yyyymmdd

and at CO-OPS THREDDS server

http://opendap.co-ops.nos.noaa.gov/thredds/catalog.html

NEGOFS or NWGOFS outputs are displayed on the CO-OPS web page at:

http://tidesandcurrents.noaa.gov

Additional information about NEGOFS or NWGOFS can be found at

http://www.tidesandcurrents.noaa.gov/models.html

NEGOFS or NWGOFS predictions are used by commercial and
recreational mariners and fishermen, emergency managers, search
and rescue operations, and NWS marine weather forecasters. The
development and implementation of NEGOFS and NWGOFS were a joint
project of the NOS/Office of Coast Survey (OCS); the NOS/Center
for Operational Oceanographic Products and Services (CO-OPS);
NWS/NCEP/NCO and the University of Massachusetts, Dartmouth; and
the Woods Hole Oceanographic Institution. NEGOFS and NWGOFS are
monitored 24x7 by both NCO/NCEP and CO-OPS Continuous Real-Time
Monitoring System (CORMS) personnel.

If you have any questions concerning these changes, please
contact:
Dr. Aijun Zhang
NOS/CO-OPS
Silver Spring, MD
Email: Aijun.Zhang@noaa.gov
 or
Dr. Frank Aikman
Marine Modeling and Analysis Branch
Coast Survey Development Laboratory
NOAA/NOS/Office of Coast Survey
Silver Spring, MD
Email: Frank.Aikman@noaa.gov

For questions regarding the dataflow aspects with respect to the
NCEP server at the WOC, please contact:
Rebecca Cosgrove
NCEP/NCO Dataflow Team
College Park, MD
Email: ncep.list.pmb-dataflow@noaa.gov

For questions on how to access NEGOFS or NWGOFS digital products
from CO-OPS servers please contact:
NOS/CO-OPS/User Services Team
Silver Spring, MD
Email: tide.prediction@noaa.gov

NWS Technical Implementation Notices are available online at:

  http://www.nws.noaa.gov/om/notif.htm

$$




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