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Excerpt taken from: WMO No. 386 Manual on the Global Telecommunication System
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| (1) | The designators specified in this table should be used to the greatest extent possible to indicate the reference time of data contained within the text of the bulletin. |
| (2) | Where the table does not contain a suitable designator for the reference time, an alphabetic designator which is not assigned in the table should be used. |
T1 |
A2 |
A2 - Reference Time Designator |
D, G, H, J, O, P or T |
A |
Analysis (00 hour) |
D, G, H, J, O, P or T
|
B |
6 hours forecast |
D, G, H, J, O, P or T
|
C |
12 hours forecast |
D, G, H, J, O, P or T |
D |
18 hours forecast |
D, G, H, J, O, P or T
|
E |
24 hours forecast |
D, G, H, J, O, P or T
|
F |
30 hours forecast |
D, G, H, J, O, P or T |
G |
36 hours forecast |
D, G, H, J, O, P or T
|
H |
42 hours forecast |
D, G, H, J, O, P or T
|
I |
48 hours forecast |
D, G, H, J, O, P or T |
J |
60 hours forecast |
D, G, H, J, O, P or T
|
K |
72 hours forecast |
D, G, H, J, O, P or T
|
L |
84 hours forecast |
D, G, H, J, O, P or T |
M |
96 hours forecast |
D, G, H, J, O, P or T
|
N |
108 hours forecast |
D, G, H, J, O, P or T
|
O |
120 hours forecast (5 days) |
D, G, H, J, O, P or T |
P |
132 hours forecast |
D, G, H, J, O, P or T
|
Q |
144 hours forecast |
D, G, H, J, O, P or T
|
R |
156 hours forecast (7 days) |
D, G, H, J, O, P or T
|
S |
168 hours forecast |
D, G, H, J, O, P or T |
T |
10 days forecast |
D, G, H, J, O, P or T
|
U |
15 days forecast |
D, G, H, J, O, P or T
|
V |
30 days forecast |
D, G, H, J, O, P or T
|
W |
Not assigned |
D, G, H, J, O, P or T |
X |
Not assigned |
D, G, H, J, O, P or T
|
Y |
Not assigned |
D, G, H, J, O, P or T
|
Z |
Not assigned |
 |
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