F 9
which broadcasts the message at about noon and repeats it every two hours until midnight. If a second warning is issued during the day, the later warning is substituted.
When a local storm warning is displayed at the Observatory, a cone is exhibited at several outlying stations for the benefit of native craft and passing ocean vessels.
In the following table is given the number of hours the local signals were hoisted in each of the years 1912-1920:-
Year Red Signals. Number of hours hoisted. Black Signals. Number of hours hoisted. Bombs. Number of times fired. 1912 151 164 1913 146 189 1 1914 146 178 1915 64 120 1916 70 201 1917 102 36 1918 33 102 1919 78 105 1 1920 107 156The figures in the above table included the number of hours that night signals, corresponding to the day signals, were hoisted.
The red signals indicate that a depression exists which may cause a gale at Hongkong within 24 hours. The black signals indicate that a gale is expected at Hongkong.
Prior to July, 1917, the red signals indicated that the centre of the typhoon was believed to be more than 300 miles distant, and the black less than 300 miles; the returns for 1912-1916 are therefore not strictly comparable with those for 1917-1920.
VI.-METEOROLOGICAL OBSERVATIONS FROM SHIPS, TREATY PORTS, &c.
Logs received.-In addition to meteorological registers kept at about 40 stations in China, meteorological logs were received from 170 ships operating in the Far East. These logs, representing 5,872 days' observations, have been utilised for verifying typhoon tracks. The corresponding figures for the year 1919 were 81 and 2,587.
* Three bombs fired at intervals of 10 seconds indicate that wind of typhoon force is anticipated.
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F 9
which broadcasts the message at about noon and repeats it every two hours until midnight. If a second warning is issued during the day, the later warning is substituted.
When a local storm warning is displayed at the Observatory a cone is exhibited at several outlying stations for the benefit of native craft and passing ocean vessels.
In the following table is given the number of hours the local signals were hoisted in each of the years 1912-1920:-
Red Signals.
Black Signals.
Bombs. *
Year.
Number of hours hoisted.
Number of times fired.
1912
151
164
1913
146
189
1
1914
146
178
1915
64
120
1916
70
201
1917
IOZ
36
1918
33
102
1919
78
105
I
1920
107
156
The figures in the above table included the number of hours that night signals, corresponding to the day signals, were hoisted.
The red signals indicate that a depression exists which may cause a gale at Hongkong within 24 hours. The black signals indicate that a gale is expected at Hongkong.
Prior to July, 1917, the red signals indicated that the centre of the typhoon was believed to be more than 300 miles distant, and the black less than 300 miles; the returns for 1912-1916 are therefore not strictly comparable with those for 1917-1920.
VI.-METEOROLOGICAL OBSERVATIONS FROM SHIPS, TREATY PORTS, &c.
Logs received.-In addition to meteorological registers kept at about 40 stations in China, meteorological logs were received from 170 ships operating in the Far East. These logs, representing 5,872 days' observations, have been utilised for verifying typhoon tracks. The corresponding figures for the years 1919 were 81 and 2,587.
* Three bombs fired at intervals of 10 seconds indicate that wind of typhoon force is anticipated.
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