NOUS41 KWBC 291303 AAA

PNSWSH

 

Technical Implementation Notice 13-41, Amended

NOAA’s National Ocean Service Headquarters Washington DC

Related by National Weather Service Washington DC

805 AM EST Wed Jan 29 2013

 

To:       Subscribers:

          -Family of Services

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network

          -NOAAPORT

          Other NWS and NOS partners and NWS and NOS employees

 

From:     Peter Stone

          Chief, Oceanographic Division

          NOS Center for Operational Oceanographic Products and

            Services (CO-OPS)

 

Subject:  Amended: Implementation of National Ocean Service’s new

          Oceanographic Forecast Modeling System for the

          San Francisco Bay Delayed until March 11, 2014

 

Amended to delay effective date until March 11, 2014

 

Effective March 11, 2014 beginning at 15z Coordinated Universal

Time (UTC), 1000 AM EST, the NOAA/National Ocean Service San

Francisco Bay Operational Forecast System (SFBOFS) will be

implemented on NOAA’s Weather Climate Operational Supercomputing

System (WCOSS) operated by NCEP Central Operations (NCO). SFBOFS

will provide users with nowcasts (analyses of near present) and

forecast guidance of the 3-dimensional physical conditions of the

San Francisco Bay, including surface water levels and 3-D water

currents, water temperature, and salinity out to 48 hours.

 

As its core ocean prediction model, SFBOFS uses 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

with a horizontal grid comprised of unstructured triangular cells

and where the irregular bottom is presented using generalized

terrain-following coordinates.

 

The SFBOFS grid consists of 54,120 nodes and 102,264 elements and

includes the near shelf from Point Reyes (north) to Point San

Pedro (south), the entrance of San Francisco Bay, and the

complete bay system (Suisin Bay, San Pablo Bay and Central and

South Bays). Grid resolution ranges from 39 km near the offshore

open ocean boundary to approximately 100 m near the coast,

indicating the flexibility of the grid size based on bathymetry

from the deep ocean to the coast. Additionally, the higher

resolution along the navigational channels within the bays, from

approximately 100 m to 10 m, provides detailed current features.

 

SFBOFS operates within the NOS Coastal Ocean Modeling Framework

(COMF) and has four daily nowcast and forecast cycles at 03, 09,

15 and 21 UTC.

 

For the SFBOFS 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 subtidal water levels, water

temperature and salinity on SFBOFS’ lateral open boundary on the

shelf are estimated based on forecast guidance from the Global

Real-Time Ocean Forecast System (G-RTOFS) and adjusted by real-

time observations at NOS water level gauges. Tides are derived

from a regional tidal model of the northeast Pacific Ocean

developed by Dr. Mike Foreman. The Navy’s Hybrid Coordinate Ocean

Model (HYCOM) and the NWS Extra-Tropical Storm Surge (ETSS) Model

are used as a backup if G-RTOFS is not available.

 

For the SFBOFS 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 subtidal water levels,

water temperature and salinity on SFBOFS’ lateral open boundary

on the shelf are estimated based on forecast guidance from 

G-RTOFS. Tides are derived from Dr. Mike Foreman’s northeast

Pacific Ocean tidal model. The Navy’s HYCOM and the NWS 

Extra-Tropical Storm Surge (ETSS) Model are used as a backup 

if G-RTOFS is not available.

 

Gridded and point forecast guidance from SFBOFS will be available

in netCDF files on the NCEP server at NOAA’s Web Operations

Centers (WOC) (ftpprd.ncep.noaa.gov) in the directory

 

/pub/data/nccfs/com/nos/prod/sfbofs.yyyymmdd

 

at NOS/CO-OPS OPeNDAP server

 

http://opendap.co-ops.nos.noaa.gov/netcdf/

 

and at CO-OPS THREDDS server

 

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

 

SFBOFS output is displayed on the CO-OPS web page at

 

http://tidesandcurrents.noaa.gov

 

Additional information about SFBOFS can be found at

 

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

 

SFBOFS 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 SFBOFS was 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. SFBOFS is 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 SFBOFS digital products from CO-

OPS servers please contact:

NOS/CO-OPS/User Services Team

Silver Spring, MD

Email: tide.prediction@noaa.gov

 

NWS National Technical Implementation Notices are online at:

 

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

 

$$