This example represents a  54 hour accumulation of a field produced by a re-forecast started on 20120101 00Z produced with the model version which is operational at 20130101 00Z .


  • In bold, the values are fixed. They are meant to be used by all partners
  • In green, these are the values for the example.
Time ( accumulated )
Start of re-forecast ( section 1 )

Octets

 

Values

Meaning of valuesGrib_api keys
12Significance of Reference Time1 

 

dataDate=20120101

dataTime=0

13-14Year (four digits)2012year of start of forecast
15Month01month of start of forecast
16Day01day of start of forecast
17Hour00hour of start of forecast
Accumulation ( section 4 e.g. template 4.61 )
18Indicator of unit of time range1Hour 
19-22Forecast time0Accumulation starts at step=0startStep=0
38-39Year of Model Version2013

 

 

When the forecast is run == when the version of the forecast used was operational

   

modelVersionDate=20130101

modelVersionTime=0

40Month of Model Version01
41Day of Model Version01
42Hour of Model Version00
43Minute of Model Version00
44Second of Model Version00
45-46year of end of overall time interval2012

 

End of accumulated period, 20120103 06Z



 

47month of end of overall time interval01
48day of end of overall time interval03
49hour of end of overall time interval06
52number of time ranges1Only one type of time statistics used (accumulation) 
53-56total number of data values missing in statistical process0  
57

Statistical process used to calculate the processed field from the field at each time increment during the time range

1AccumulationstepType=accum
58

Type of time increment between successive fields used in the statistical processing

2

Successive times processed have same start time of forecast, forecast time is incremented

 
59

Indicator of unit of time for time range over which statistical processing is done

1Hour 
60-63

Length of the time range over which statistical processing is done, in units defined by the previous octet

54Time step (in hour) at the end of the accumulation from start of forecastendStep=54 
64

Indicator of unit of time for the increment between the successive fields used

255Missing 
65-68

Time increment between successive fields, in units defined by the previous octet

00 

 

Examples of grib2 headers: