IS0: Indicator Section

Standard

octet(s) content value meaning notes
1-4 "grib" definition 71, 82, 73, 76 'GRIB' Coded according to the International Alphabet Number 5
5-6 reserved      
7 discipline 0 meteorological  
8 grib edition number 2    
9 total length of grib message in octets varies    

 

IS1: Identification Section

Standard

octet(s) content value meaning
1-4 length of section in octets 21  
5 section number 1  
6 ID of originating center 7 National Weather Service - NCEP
8 ID of origin sub-center 14 MDL
10 GRIB master tables version number 1  
11 GRIB local tables' version number 0  
12 significance of reference time 1 start of forecast
13-14 Year varies  
15 Month varies  
16 Day varies  
17 Hour 0  
18 Minute 0  
19 Second 0  
20 Production Status of Processed data in the GRIB message 0 operational product
21 Type of processed data in this GRIB message 1 forecast products

 

tstm03

octet(s) content value meaning
1-4 length of section in octets 21  
5 section number 1  
6 ID of originating center 7 National Weather Service - NCEP
8 ID of origin sub-center 9 Storm Prediction Center
10 GRIB master tables version number 2  
11 GRIB local tables' version number 1  
12 significance of reference time 1 start of forecast
13-14 Year varies  
15 Month varies  
16 Day varies  
17 Hour 0  
18 Minute 0  
19 Second 0  
20 Production Status of Processed data in the GRIB message 1 operational test product
21 Type of processed data in this GRIB message 1 forecast products

spc_svr

octet(s) content value meaning
1-4 length of section in octets 21  
5 section number 1  
6 ID of originating center 7 National Weather Service - NCEP
8 ID of origin sub-center 9 Storm Prediction Center
10 GRIB master tables version number 1  
11 GRIB local tables' version number 1  
12 significance of reference time 1 start of forecast
13-14 Year varies  
15 Month varies  
16 Day varies  
17 Hour 0  
18 Minute 0  
19 Second 0  
20 Production Status of Processed data in the GRIB message 1 operational product
21 Type of processed data in this GRIB message 1 forecast products