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Signal No. Meaning TCWS #1 winds of 30–60 km/h (19–37 mph; 16–32 kn) are prevailing or expected to occur within 36 hours: TCWS #2 winds of 61–120 km/h (38–74 mph; 33–64 kn) are prevailing or expected to occur within 24 hours: TCWS #3 winds of 121–170 km/h (75–105 mph; 65–91 kn) are prevailing or expected to occur within 18 ...
Signal number Signal name Symbol Meaning 1 Standby (戒備) No. 1 signal is an advisory signal for when there is a tropical cyclone centred within about 800 kilometres of Hong Kong. If strong winds are not expected within 24 hours, the issuance of the signal may be delayed.
In Hong Kong the typhoon signal system consists of 8 signals in 5 levels numbered non-consecutively for historical reasons. [26] [27] Each signal has a day signal and a night signal for hoisting, which are still hoisted in Macau but no longer hoisted in Hong Kong. Day signals are also used as signal symbols in both places.
In Hong Kong, the Hong Kong Observatory raised typhoon signal 1 at 12.40pm on November 8, and Signal 3 on November 9 at 3.40pm. [57] [58] The cross harbour swimming race in Victoria Harbour scheduled for November 10 was cancelled. [59] In Macau, typhoon signal 1 was raised on November 8 on 11am followed by Signal 3 on November 9 at 11pm. [60]
It was revised by the Board of Trade in 1887, and was modified at the International Conference of 1889 in Washington, D.C. [1] The new international code of signals officially came into worldwide operation on 1 January 1901. At first it was used concurrently with the old system until 1 January 1902, and then used exclusively after 1 January 1903.
On September 3, the Hong Kong Observatory issued a Standby Signal No.1 warning over Hong Kong as Yagi approached the territory [55] at the strength of a Category 4 typhoon. [56] The following day, the Strong Wind Signal No. 3 was hoisted, and six HK Express flights were rescheduled. [57] More than 100 flights were also cancelled. [30]
In preparation for the tropical depression, the HKO issued a Signal No. 1 warning for Hong Kong at 13:40 UTC on July 18, which was later upgraded to a Signal No. 3 warning as Cempaka neared the Pearl River Delta. However, as it moved away from Hong Kong, the HKO downgraded it to a Signal No. 1 warning, which was later cancelled at 11:40 UTC.
The Philippines is a typhoon-prone country, with approximately twenty tropical cyclones entering its area of responsibility per year. Locally known generally as bagyo (), [3] typhoons regularly form in the Philippine Sea and less often, in the South China Sea, with the months of June to September being the most active, August being the month with the most activity.