This page contains a few rules on the TIGGE parameters. A complete list of all the parameters and sample GRIB2 encoding is given here.
Units
- All fields should use units as defined in GRIB Edition 2
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Grids are defined in GRIB2 using an accuracy of 1/1000000 (one millionth) of a degree. If this accuracy is not sufficient to describe your grid (latitude/longitude of first and last points, as well as grid increments) without loss of information, you can use a GRIB2 feature that provides a way to describe any regular grid. See the page on encoding global latitude/longitude grid for more details.
Number of forecasts
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You should use value 5 when testing (and set the vvvv part of the file naming convention to test), and 4 for operational data (in this case vvvvshould be set to prod).
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