NOUS41 KWBC
041700 AAA
PNSWSH
Service Change
Notice 17-108 Updated
National Ocean
Service Headquarters Silver Spring MD
Related by
National Weather Service Silver Spring MD
100 PM EST Mon
Dec 4 2017
To: Subscribers:
-NOAA Weather Wire Service
-Emergency Managers Weather
Information Network
-NOAAPort
Other NWS and NOS partners and NWS
and NOS employees
From: Patrick Burke
Chief, Oceanographic Division
NOS/Center for Operational
Oceanographic Products
and Services
Subject: Updated: Implementation of new Oceanographic
Forecast
Modeling System for the Gulf of Maine
Effective January 3, 2018
Updated to change
the implementation date from Dec 19, 2017 to
Jan 3, 2018 and
to include major changes to the details related
to the upgrade. Users are urged to read through
this entire
notice.
Effective January
3, 2018 beginning at 18z Coordinated Universal
Time (UTC), the
NOAA/National Ocean Service (NOS) Gulf of Maine
Operational
Forecast System (GoMOFS) will be implemented on
NOAA’s Weather
Climate Operational Supercomputing System (WCOSS)
operated by NCEP Central Operations (NCO) and
maintained by the
Center for Operational
Oceanographic Products and Services (CO-
OPS).
1) GoMOFS System
GoMOFS will provide users with nowcasts
(analyses of near
present) and forecast guidance of the
three-dimensional physical
conditions of the Gulf of Maine, including surface
water levels
and 3-D water currents, water temperature, and
salinity out to
72 hours.
As its core ocean
prediction model, GoMOFS uses the Regional
Ocean Modeling
System (ROMS) developed by the ocean modeling
community and supported by Rutgers University. ROMS is a free-
surface, terrain-following, primitive equations
ocean model
widely used by the scientific and operational
community for a
diverse range of applications. GoMOFS
operates within the NOS
Coastal Ocean
Modeling Framework (COMF) and has four daily
nowcast and forecast cycles at 00, 06, 12, and 18
UTC.
The GoMOFS orthogonal grid has 1173 x 777 horizontal grid
points
with roughly 700m horizontal resolution. The
vertical grid
follows the terrain and consists of 30 model levels.
The grid
bathymetry of the Gulf of Maine ranges from 3m near the
coast to
4,500m
along its southern open boundary.
The surface
meteorological forcing used to run GoMOFS is based
on forecast guidance from the National Weather
Service (NWS)
North American
Mesoscale (NAM) weather prediction model (for
both nowcast and
forecast). Forecast guidance from the NCEP
Global Forecast
System (GFS) are used as a backup forcing if
forecast guidance from the NAM is not available.
GoMOFS relies on NCEP’s Global Real-Time Ocean
Forecast System
(G-RTOFS) to
provide open boundary temperature, salinity and
sub-tidal water level. The ADCIRC 2001 Tidal Database
is used to
generate GoMOFS tidal
forcing. Additionally, near real-time
observations from USGS river gauges are used to specify
river
discharge, river temperature and salinity at seven
major rivers
observations at seven major rivers in the Gulf of Maine.
2) GoMOFS Product Output
Fields and
station forecast guidance from GoMOFS will be
available in netCDF format
on CO-OPS THREDDS server
http://opendap.co-ops.nos.noaa.gov/thredds/catalog.html
and on NCEP Web services under gomofs.YYYYMMDD
http://nomads.ncep.noaa.gov/pub/data/nccf/com/nos/prod/
ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/nos/prod/
http://www.ftp.ncep.noaa.gov/data/nccf/com/nos/prod/
Where YYYYMMDD is
year, month, and day
GoMOFS is currently displayed in developmental mode
here:
https://tidesandcurrents.noaa.gov/ofs/dev/gomofs/gomofs_info.html
https://tidesandcurrents.noaa.gov/ofs/dev/gomofs/gomofs.html
After it is
transitioned to production, it will be displayed at:
https://tidesandcurrents.noaa.gov/ofs/gomofs/gomofs_info.html
https://tidesandcurrents.noaa.gov/ofs/gomofs/gomofs.html
GoMOFS has two types of model output data. Where
YYYYMMDD is
year, month, day; CC is cycle (00, 06, 12, 18)
- One is
field/gridded data which include three-dimensional
gridded data with 3 hour interval and
two-dimensional gridded
surface data with one hour interval.
nos.gomofs.fields.nHHH.YYYYMMDD.tCCz.nc
HHH is 003 and 006
nos.gomofs.fields.fHHH.YYYYMMDD.tCCz.nc
HHH is 003, 006, ...,072
for surface layer field NetCDF
file,
nos.gomofs.2ds.nHHH.YYYYMMDD.tCCz.nc
HHH is 001-006
nos.gomofs.2ds.fHHH.YYYYMMDD.tCCz.nc
HHH is 001, 002, 003, ...,
072
- Flag log file
for generating flags for Continuous Operational
Real-Time
Monitoring System (CORMS)
nos.gomofs.corms.YYYYMMDD.tCCz.log
- Initial files
for nowcast:
nos.gomofs.init.nowcast.YYYYMMDD.tCCz.nc
- ROMS runtime
log file:
nos.gomofs.jlogfile.YYYYMMDD.tCCz.log
nos.gomofs.nowcast.YYYYMMDD.tCCz.log
nos.gomofs.forecast.YYYYMMDD.tCCz.log
- The other is
station/point output data with 6 minutes
interval. Water lever, surface wind, water
temperature, water
salinity and currents are the preliminary output
variables.
nos.gomofs.stations.nowcast.YYYYMMDD.tCCz.nc
nos.gomofs.stations.forecast.YYYYMMDD.tCCz.nc
3) Model input
files
Surface
meteorological forcing NetCDF file,
nos.gomofs.met.nowcast.YYYYMMDD.tCCz.nc
nos.gomofs.met.forecast.YYYYMMDD.tCCz.nc
River forcing
file:
nos.gomofs.river.YYYYMMDD.tCCz.nc
Open boundary
forcing file:
nos.gomofs.obc.YYYYMMDD.tCCz.nc
Tidal open
boundary forcing file:
nos.gomofs.roms.tides.YYYYMMDD.tCCz.nc
ROMS runtime
input file:
nos.gomofs.nowcast.YYYYMMDD.tCCz.in
nos.gomofs.forecast.YYYYMMDD.tCCz.in
Climatological
nudging file:
nos.gomofs.clim.YYYYMMDD.tCCz.nc
GoMOFS predictions are used by commercial,
recreational
mariners, fisherman, emergency managers, search and
rescue
responders, and NWS marine weather forecasters. The
development
and implementation of GoMOFS
is a joint project between the
NOS/Office of
Coast Survey (OCS), the NOS/Center for Operational
Oceanographic
Products and Services (CO-OPS), and NWS/NCEP/NCO.
Rutgers
University provided technical support for ROMS.
GoMOFS
is monitored 24 x 7 by both NCO/NCEP and CO-OPS
Continuous Real-
Time
Monitoring System (CORMS) personnel.
NCEP urges all
users to ensure their decoders can handle changes
in content order and volume changes. These
elements may change
with future NCEP model implementations. NCEP will
make every
attempt to alert users to these changes before
implementation.
As part of NCEP’s
standard 30 day parallel testing, the new
output products will be available here:
http://para.nomads.ncep.noaa.gov/pub/data/nccf/com/nos/para/
Any questions,
comments or requests regarding this
implementation should be directed to the contacts
below. We
will review any feedback and decide whether to
proceed.
If you have any
questions concerning these changes, please
contact:
Dr. Aijun Zhang
NOS/Center for
Operational Oceanographic Products and Services
Silver Spring, MD
Email: Aijun.Zhang@noaa.gov
For questions
regarding the dataflow aspects, please contact:
Carissa Klemmer
NCEP/NCO Dataflow
Team Lead
College Park, MD
Email: ncep.list.pmb-dataflow@noaa.gov
NWS National
Service Change Notices are online at:
http://www.nws.noaa.gov/os/notif.htm
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