THE HONG KONG GOVERNMENT GAZETTE, JUNE 2, 1932.
429
(5) The third and lowest symbol of the group (b) indicates the radius of the circle whose centre is shown by the latitude and longitude, together with the degree of intensity, or alternatively, one of four conditions which can sometimes be given in addition to the direction of motion (Table 1) and in preference to the radius and intensity signal.
(6) The only velocity signals given are "stationary or very slow", which is an alternative to the direction of motion, and "exceptionally high rate of travel" which may be given in addition to direction of motion.
In this connection the following table, extracted from the China Seas Storm Signal Code will be useful:-
Latitude (North).
O
Ordinary limits.
Mean.
Rate of travel of typhoons in the Far East (Knots).
Before recurving.
Exceptional
Velocity
as signalled.
Maximum
recorded.
Ordinary limits.
5 to 15
5 to 12
11 or above
22
15
20 5
14
10
121
20 25
7
16
11
13
>>
"}
25 30 7
13
11
13
15
91
"
30 35
""
35 40
""
+ 2 1999
10
24
40
45
"2
45
50
50
55
19
5 to 17 10
14
11
25
"
23 17
23 18
Mean.
After recurving.
Exceptional
as signalled. Velocity
Maximum
recorded.
22
30
42
50
48
52
49
1 2 2 2 8 * N =
13 or above
21
""
23
47
"
25
34
26
>>
>
ར
26
26
"
26
"3
2 2 2 2 2 2 2
11,, 36
20
16
12, 36 21
36
17
12,, 36
21
12,, 37 21
བ . 7
21
(7) Caution.-The position indicated by the latitude and longitude signals does not purport to be the position of the centre of the typhoon, but merely the centre of a circle of specified radius within which the centre of the typhoon is believed to lie.
(8) The Time Signal (Table 2) indicates the time at which the typhoon or depression was in the position indicated. Symbol No. 9 provides for occasions when the centre has been located from observations at other than routine hours.
**