Table 2. WMO GRIB bulletin header descriptors.

T1 T21 A12 A2 dd Station id
O A
B
C
J
K
M
N
P
Y
N A
C
E
G
I
J
K
L
M
X
N
Y
O
88 KWBJ
Where:

T1 is the bulletin type descriptor: O - oceanographic.

T2 is the parameter descriptor, see notes below.

A1 is the grid and domain descriptor: N - 0.50o x 0.25o lon/lat grid over domain from 160E - 124W and 45N - 75N.

A2 is the forecast hour descriptor, see notes below.

dd is the surface descriptor: 88 - ocean surface.

Notes:

1. Parameter descriptors

A - u-wind component
B - v-wind component
C - Total significant wave height
J - Peak wave period
K - Peak wave direction
M - Peak wind sea period
N - peak wind sea direction
P - Dm
Y - Tm

2. Forecast hour descriptors at 6-h intervals from 0- to 72-h.