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Level
Type of first fixed surface= 100 Specified height level above ground (m)Isobaric surface Pa
Scale factor of first fixed surface= 0 
Scaled value of first fixed surface= value in Pa Value of the field in Pascal
Type of second fixed surface= all bits to 1Missing
Scale factor of second fixed surface= all bits to 1Missing
Scaled value of second fixed surface= all bits to 1Missing

 

A description of how to code re-forecasts in GRIB2 is available here

A description of how to code the data as S2S is available here

 

GRIB 2 and C-code for:  Perturbed forecast  Control forecast Perturbed re-forecast and Control re-forecast
GRIB 2
Discipline= 0  
Parameter Category= 3  
Parameter Number= 5  
Type of first fixed surface= 100Type of second fixed surface= All 1's
Scale factor of first fixed surface= 0Scale factor of second fixed surface= All 1's
Scaled value of first fixed surface= value in PaScaled value of second fixed surface= All 1's