NOTICE:
Due to ongoing network issues with our supercomputers we may have to
temporarily suspend our web site updates periodically while
our sysadmins work on the problem. We apologize for the inconvenience.
Global RTOFS
A hybrid coordinate, 1/12° global ocean model, run once a day. Each run
starts with 48 hours of hindcasting and produces forecasts every 3 hours
(surface values only) and daily
full-volume forecasts from the initial time (0Z) out
to 144 hours (6 days).
Atlantic RTOFS
A hybrid coordinate, nominally 1/12° North and Equatorial Atlantic basin
model, run once a day. Each run starts with 24 hours of hindcasting and
produces forecasts every hour (surface values only) and
daily full-volume forecasts from the initial time (0Z) out to
144 hours (6 days).
Fukushima Tracers
NCEP/NWS deployed three-dimensional particle tracing
within our Global RTOFS system to predict the long-term movement of radionuclides
in the ocean shortly after the Japanese nuclear disaster near Fukushima.
Fukushima Surface Plume Study
NCEP/NWS conducted a surface plume study using data from our Global
RTOFS system to predict the first 100 days of movement of radionuclides
in the ocean shortly after the Japanese nuclear disaster near Fukushima.
NOTICE OF PUBLIC RELEASE:
A new version of WAVEWATCH III version 5.16 has been released.
Details about the model and how to obtain the code can be
found here.
A third generation wave model run four times a day (00Z, 06Z, 12Z, and
18Z). Each run starts with 9-, 6- and 3-hour hindcasts and produces forecasts
of every 3 hours from the initial time out to 180 hours (84 hours for the Great Lakes).
The Polar and Great Lakes Ice group works on sea ice analysis from satellite,
sea ice modeling, and ice-atmosphere-ocean coupling. Our work supports
the Alaska Region of the
National Weather Service, the Great
Lakes Marine Forecasting group in the Cleveland
NWSFO, and other groups, as well as the Environmental
Modeling Center, of which the ice group is a part. Ice group: longer description
Because there are a number of different uses for sea surface temperature
analysis, a number of different analyses have been developed at NCEP. The two
families are the RTG -- Real Time Global, and the OI -- Optimal
Interpolation (aka Reynolds SST). The RTG analyses are aimed at weather
prediction and modeling, particularly at high resolution and short range.
The OI analyses are lower resolution and aimed more at long range weather
and climate. Both have a history.
Marine Meteorology Group Products
Ocean Winds
- Satellite Remote Sensing:
Sensors: SSM/I and QuikSCAT
Products: wind speeds, wind vectors, atmospheric water vapor & liquid water
concentrations
Coastal Visibility:
The lowest layer Coastal Visual Range Guidance products are provided as
post-processed fields direct from the NAM (12 km resolution currently)
model. The data used for the lower 48 states are taken from a 40km Lambert
Conformal grid and applied to a 0.25° X 0.25° lon/lat grid over North
America. The data used for Alaska are taken from a 45 km polar stereographic
grid and applied to a 0.25° X 0.25° lon/lat grid over Alaska and
adjacent water bodies. These fields are in meters and have been converted to
nautical miles on the depictions shown on this web page.
Global Visibility:
This guidance is based on the GFS Model output and uses a modified version
of the Stoelinga and Warner algorithm used in the eta mesoscale model. The
GRIB output files have output in meters from 0 - 20,000 meters. The
graphical display is designed primarily for the use of mariners.
Vessel Icing:
The NCEP superstructure ice accretion forecast system was developed by
applying statistical algorithms developed by Overland and Pease at the
Pacific Marine Environmental Research Laboratory in the mid-1980s. The
algorithm relates icing to wind speed, freezing point of sea water, air
temperature, and sea surface temperature. The method is designed for
trawlers in the 20 to 75 meter length range, underway at normal speeds in
open seas and not heading downwind.
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SDM Contact Notes:
Ocean Models -- Avichal Mehra
Wave Models -- Arun Chawla
Sea Ice -- Robert Grumbine
SST -- Bert Katz
Marine Meteorology -- Robert Grumbine
General Server Issues -- Robert Grumbine