Page History

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	parameter	Discipline	Category	parameter Number	Description
1	U-component of wind ( 10 m )	0 [ M products ]	2 [ Momentum ]	2
2	V-component of wind ( 10 m )	0 [ M products ]	2 [ Momentum ]	3
3	Significant height of combined wind waves and swell	10 [ O products ]	0 [ Waves ]	3
4	Peak wave period	10 [ O products ]	0 [ Waves ]	34	Mean wave period based on the second moment of the frequency spectrum
5	Mean zero-crossing wave period	10 [ O products ]	0 [ Waves ]	28
6	Direction of combined wind waves and swell	10 [ O products ]	0 [ Waves ]	14	Mean wave direction

NCEP sample file  multi_1.glo_30mext.t00z.f000.grib contains:

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title	NCEP GRIB2 summary

parameter

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Name

Discipline

Category

parameter
Number

vertical level

horizontal grid

time

bitmap

file

u-component of wind

0

2




typeOfFirstFixedSurface = 1 
[Ground or water surface]

gridDefinitionTemplateNumber = 0 [Latitude/longitude]
latitudeOfFirstGridPoint = 90000000
longitudeOfFirstGridPoint = 0
resolutionAndComponentFlags = 48 [00110000]
latitudeOfLastGridPoint = -77500000
longitudeOfLastGridPoint = 359500000
iDirectionIncrement = 500000
jDirectionIncrement = 500000

IndicatorOf

UnitOfTimeRange = 1 [Hour]



bitMapIndicator = 0 
[A bit map applies to this product]

v-component of wind

0

2

3

Significant height of 
combined wind waves and swell

10

0

3

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Dump of one of the messages

( Note that since the sections over all the messages are quite similar this dump summarizes the whole content of the file )

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multi_1.glo_30mext.t00z.f000.grib

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Dump of one of the messages