What this page is about

This is a slimmed down version of Jim Coremman’s Available Saildocs Grib Data

NOTE The format of request message is as at the Saildocs page. Codes are given below. Grid spacing in request messages should be multiples of the quoted resolution. Times are UTC.

Code: GFS

The NOAA (NCEP) Global Forecast System is the model most likely to be available in GRIB apps and the most used by sailors.

  • Model resolution: 0.125 degrees
  • Available multiples of 0.25 degrees

Forecast periods:

  • 120 hours, 3-hourly intervals on a 0.25 x 0.25-deg grid;
  • 123-192 hours, 3-hourlyintervals on a 0.5 x 0.5-deg grid;
  • 198-240 hours, 6-hourly intervals on a 0.5 x 0.5-deg grid;
  • 252-384 hours, 12 hourly intervals on a 1.0 x 1.0-deg grid.

Approximate update times:

  • 0510
  • 1110
  • 1710
  • 2310


  • PRMSL (PRessure/Mean Sea Level)
  • WIND (10 metres above surface)
  • GUST (at 10 metres)
  • AIRTMP (temperature 2 metres above surface)
  • SFCTMP (temp at sea surface)
  • RH (Relative Humidity 2m above surface)
  • LFTX (LiFTed indeX)
  • CAPE (Clear Air Potential Energy)
  • RAIN (Precip rate, mm/hr)
  • APCP (Accumulated precip)
  • HGT500 (500hPa height)
  • TMP500 (temperature at 500hPa level)
  • WIND500 (Wind velocity at 500hPa level)
  • ABSV (Absolute vorticity at 500hPa)
  • CLOUDS (Total cloud cover)
  • WAVES (Significant wave height )

A typical request could be:
send GFS:26N,20N,114W,105W|0.25,0.25|0,6..72|WIND,PRMSL,RAIN,WAVES
The default is WIND, PRMSL

Codes: GFSwave and ww3euro:

NOAA's WW3 wave model is run with the GFS on the same schedule and grid.

Code WW3EURO covers the area

  • 29N,66N,015W,045E, Europe and the Black Sea
  • Resolution 0.2 x 0.2 degrees

Times: To 96 hrs, 6-houtly increments


  • HTSGW (Significant Height of Combined Wind Waves and Swell)
  • DIRPW (Direction of the Primary Wave - towards)
  • PERPW (Period of the Primary Wave)
  • WVHGT (Wind Waves Significant Height)
  • WVDIR (Wind Waves Direction - towards)
  • WVPER (Wind Waves Mean Period)
  • SWELL (Swell Wave Sig. Height primary swell)
  • SWDIR (Swell Wave Direction [104]
  • SWPER (Swell Wave Mean Period)
  • WIND (Wind from the GFS input to WW3)

A typical request could be:
send WW3:26N,20N,114W,105W|0.25,0.25|0,6..72|WIND,HTSGW,DIRPW,PERPW

Code: NDFD

National Digital Forecast Database
A US National Weather Service (NWS) development project. Although fairly static for a long time, data availability may be expanded. Currently wind and wave data are available for the areas shown, i.e. those that are the responsibility of the US NOAA.

  • Output resolution: 0.05 degree, about 5 km, .


  • Forecast period 1-3 days, every 3 hours from 0120.


  • WIND
  • GUST
  • WAVES.

A typical request would be:
send NDFD:24N,20N,110W,105W|0.05,0.05|06,3..36|


Data from the ECMWF HRES model are listed in the Catalogue but are only on prepayment. However, a limited amount of data are now “Open Data” and can be freely distributed.

  • Resolution: 0.1 degree.
  • Available 0.4 degrees


  • 0 to 144 hours at 3-hourly intervals
  • 144 to 240 hors at 6-hourly intervals

Approximate update times:

  • 0800
  • 2000


  • WIND (10 metres above surface)
  • MSLP
  • TEMP (temperature 2 metres above surface)
  • HGT500 (500hPa height)

A typical request might be:
send ECMWF:35N,19N,123W,102W|0.4,0.4|0,3..72|MSLP,WIND
The default is WIND.


ICON is a global model run by DWD, the German Met service.

  • Resolution: 0.125 degree.
  • Available 0.125 degrees


  • From 00/12 UTC data, to 180 hours at 3-hourly intervals
  • From 06/18 UTC data, to i2o hors at 3-hourly intervals

Approximate update times:

  • 0400
  • 1000
  • 1600
  • 2200


  • PRMSL (PRessure/Mean Sea Level)
  • WIND (10 metres above surface)
  • GUST (at 10 metres)
  • AIRTMP (temperature 2 metres above surface)
  • SFCTMP (temp at sea surface)

A typical request could be:
send ICON:26N,20N,114W,105W|0.125,0.125|0,6..72|WIND,MSLP,SFCTMP,

Code: ICON

Using the same code, there is a higher-resolution regional version. Saildocs will self select the model.

  • Area: 29.5N-70.5N and 023.5W-045.0E.
  • Output eesolution 0.0625 x 0.0625 degrees (around 7km)


  • 8 tmes daily from 00 UTC, to 120 hours.
  • Available 3 hours after data time. Saildocs will select the appropriate data for the requested area.

A typical request could be:
send ICON:46N,51N,5W,16E|0..06,0.06|0,6..72|WIND,MSLP,SFCTMP,


NAVGEM is the Navy model.

  • Model resolution: 0.18 degrees
  • Available multiples of 1 degree


  • 24 hours, 3-hourly intervals
  • 24-96 hours, 6-hourlyintervals

Approximate update times:

  • 0600
  • 1200
  • 1800
  • 2400


  • WIND
  • HGT (500hPa height)


COAMPS is the US Navy Meso-scale model (LAM). It uses NAVGEM for initial and boundary conditions. The model is run for:

  • NE Pac: 34-64N,172-118w
  • So Cal: 22-43N,128-109W
  • Eq. Am: 12-32N,122-058W
  • W Atl: 20-55N,093-055W
  • Euro: 29-66N,015W,040E
  • Available om 0.15 x 0.15-deg grid
  • Times: to 96 hours (except 72 hrs for w-Atl).

Default parameters

  • WIND. The euro model is 96 hours at 6-hour intervals for pressure and wind.

Code: HRRR:

HRRR - High Resolution Rapid Refresh" is a the latest NOAA hi-res forecast model covering the contiguous USA - as shown here.

  • Resolution: maximum 0.03 degrees.
  • Times: hourly forecasts:
    • To 18 hours, updated hourly. About HH+1.5.
    • To 48 hours, updated 6-hourly at about HH+2


  • PRMSL (pressure at sea level)
  • WIND (10 metres above surface)
  • GUST (10 metres)
  • AIRTMP (temperature 2 metres above surface)
  • SFCTMP (temp at surface)
  • LFTX (Lifted index)
  • CAPE (clear air potential energy)
  • RAIN (Precip rate, mm/hr)
  • APCP (Accumulated precip)

Typical trequest send HRRR:35N,31N,122W,116W|0.2,0.2|0,1..24|WIND,RAIN

Code: RTOFS:

RTOFS is NOAA's ocean current forecasts based on the HYCOM model

  • Times: To 72 hours at 3-hour intervals
  • Available around 1100
  • 72 to 192 hours at 6-hour intervals
  • Available around 17:00z.


  • WTMP (Water temperature)
  • DSL_M (sea-level deviation)
  • and SALTY (salinity)
  • ICE (Ice concentration)
  • ICETK (icethickness)

The default is CURRENT.

A request might be:
Send RTOFS:55N,30N,80W,70W|0.2,0.2|0,3..24|

Not all GRIB viewers handle RTOFS. Two that will are