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THE HONG KONG GOVERNMENT GAZETTE, DECEMBER 19, 1930.
No. 766
NON-LOCAL STORM SIGNAL CODE, SUITABLE UNIVERSALLY FOR VISUAL AND TELEGRAPHIC STORM WARNINGS, ALSO FOR THE "GENERAL INFERENCE" FOLLOWING SYNOPTIC WEATHER MESSAGES.
Recommended for use in the Far East at a Conference of Directors of Far Eastern Weather Services, held at Hong Kong in the year 1930.
Adopted at Hong Kong from 1931, March 1.
The Code is an adaptation of the China Seas Storm Signal Code which has been in use in China since 1918.
The following ten symbols are used:-
LT+A
X
indicating the figures
1
2
4 5 6 7
8
9
0
(2) The signals are hoisted at the yard-arms and at the mast head of a Storm Signal Mast and have the following significance:--
Typhoon and depression Signals:-
(a) 4 symbols at one yard-arm showing the position of the centre. (6) 3 symbols at the other yard-arm, showing the direction of motion or, alternatively, certain conditions; also the accuracy with which the centre has been located, and the intensity. (Tables 1, 2 and 3). (c) 1 symbol at the mast head showing the time at which the centre was
in the position indicated (Table 4).
Gale Signals:-
(d) 1 symbol at one yard-arm showing the region threatened (Table 5). (e) 2 symbols at the other yard-arm showing the general direction from which the gale is blowing, in points: 08 East, 16-South, 24-West, 32-North.
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(f) 1 symbol at the mast head showing the time at which the gale was as
stated.
(3) The two upper symbols of group (a) indicate by their corresponding num- bers the latitude, and the two lower symbols the longitude, of the centre of a circle (of a radius specified by the lowest symbol of group (b)) within which the centre of the typhoon or depression lies. The symbols for longitude give the tens and units only; thus 32 indicates longitude 132°.
(4) The two upper symbols of group (b) indicate the direction in which the typhoon etc., is travelling (Table No. 1) or alternatively, certain conditions (Table 2).
(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.
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