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The complete WMO compliant GRIB2 definitions of all wave parameters are linked in the page Wave verification LC-WFV technical details

General encoding details

Specific details which should be encoded in GRIB2 sections 1 and 4:

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parameter

Sample file

10 metre U wind component 

WAVE_165.128_1x1.grb2wave.10u.grib2

10 metre V wind component 

WAVE_166.128_1x1.grb2wave.10v.grib2
Mean wave period based on second momentWAVE_221.140_1x1.grb2wave.mp2.grib2
Mean wave directionWAVE_230.140_1x1.grb2wave.mwd.grib2
Peak wave periodWAVE_231.140_1x1.grb2wave.pp1d.grib2

Significant height of combined wind waves and swell

WAVE_229.140_1x1.grb2wave.swh.grib2