Table 3. WMO GRIB bulletin header descriptors.

T₁ T₂¹ A₁² A₂ dd Station id

O A
B
C
J
K
M
N
P
Y
Q A
C
E
G
I
J
K
L
M
X
N
Y
O
P
Q
Z
R
S
T
U
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: Q - 0.25^o x 0.25^o lon/lat grid over domain from 170.25W - 76.25W and 4.75N - 62.25N.
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 - D_m
Y - T_m
2. Forecast hour descriptors at 6-h intervals from 0- to 72-h and at 12-h intervals from 72- to 168-h.

T₁	T₂¹	A₁²	A₂	dd	Station id
O	A B C J K M N P Y	Q	A C E G I J K L M X N Y O P Q Z R S T U	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: Q - 0.25^o x 0.25^o lon/lat grid over domain from 170.25W - 76.25W and 4.75N - 62.25N. 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 - D_m Y - T_m 2. Forecast hour descriptors at 6-h intervals from 0- to 72-h and at 12-h intervals from 72- to 168-h.