Gribfiles

NAME

Gribfiles - Serve grib files on the coast from Oslo and Western Norway

DESCRIPTION

This module make some of our grib files available for access and download. The content is made to support yachts and yachting. Note that these files are meant for downloading and used with external software. All areas have all kind of contents. The data are delivered with content type application/octet-stream.

The files are updated every 3 hours, or maybe every 6 hours, possibly even every 12 hours (which is actually every 24 hours, but the files are produced twice). (Yeah, we know, hopefully we can add an "updated" field to /available soon.)

If you need other parameters or areas, please look at THREDDS (NetCDF only, no GRIB).

Data content

The area covered is from 57°54'00"N, 4°26'59"E to 63°00'00"N, 7°00'00"E, in 0.05° increments.

Some of the more standard variables will have a shortName parameter, others don't and you'll have to use grib_dump to figure it out. The standard variable codes are defined here:

https://codes.ecmwf.int/grib/format/grib1/ctables/

The following variables are included:

Current

10fg

u-component of current (m/s) (Not 10 metre wind gust!)

lspf

v-component of current (m/s) (Not Large-scale precipitation fraction!)

Both at -3 m below sea surface.

Weather

pres

Surface Pressure at surface (Pa)

10u

10v

Wind speed 10 m above surface (m/s)

unknown

Total precipitation at surface for period until next step (kg/m^2)

Waves

swh

Significant height of combined wind waves and swell (meters)

mwd

Mean wave direction (degree)

Previously the waves data files followed oceanographic convention, meaning that the value indicated which way the waves were moving. The new model, effective 10 Oct 2023, follows meteorological convention, i.e. where they are coming from. If you are drawing arrows you will need to rotate the direction 180 degrees.

USAGE

Parameters

• area

  Valid areas are: oslofjord, skagerrak, sorlandet, west_norway, n-northsea, troms-finnmark, nordland

• content

  Valid datatypes are: weather, current and waves

Available

Available is implemented.

• https://api.met.no/weatherapi/gribfiles/1.1/available
• https://api.met.no/weatherapi/gribfiles/1.1/available.json?content=waves

Sample request URLs

• https://api.met.no/weatherapi/gribfiles/1.1/?area=oslofjord&content=weather
• https://api.met.no/weatherapi/gribfiles/1.1/?area=sorlandet&content=current
• https://api.met.no/weatherapi/gribfiles/1.1/?area=skagerrak&content=waves
• https://api.met.no/weatherapi/gribfiles/1.1/current?area=oslofjord

Change log

Update of 1.1 2023-10-10

mywavewam4 model replaced by wavewatch_4km, as announced on the mailing list on 1 June 2023. The new model follows the meteorological convention of the values indicating where the waves are coming from. instead of going to as in the old model.

Production of current data for n-northsea (norkyst4km) stopped in 2022, and has been removed from the API.

Update of 1.1 2016-12-15

added areas nordland and troms-finnmark

Update of 1.1 2016-12-05

added area n-northsea

1.1 2016-09-01

Version 1.0 will be end of lifed at 2016-11-15.

Due to changes in which models are available, all files are changed. Please refer to the documentation for details of available data.

We do not longer support bzip2 as compression. All files is less than 5MB.

1.0 2011-12-08

oslofjorden is discontinued due to changes in available model data.

skagerrak will only have current data available.

1.0 2008-01-04

First version

See also

More wave data available on https://thredds.met.no/thredds/fou-hi/fou-hi.html as NetCDF files.