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).
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).
NCEP/NWS deployed particle tracing within our Global RTOFS system
to predict the movement of radionuclides
in the ocean shortly after the Japanese nuclear disaster near Fukushima.
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).
Because there are a number of different uses for sea surface temperature
analysis, a number of different analyses have developed in NCEP. The two
families are the RTG -- Real Time Global, and the OI -- Optimal
Interpolation. 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.
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.
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.
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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