NOUS41 KWBC 081935 AAA

PNSWSH

 

Technical Implementation Notice 14-26 Amended

National Ocean Service Headquarters Washington DC

Relayed by National Weather Service Washington DC

330 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

 

$$