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The TCWS system is a tiered system (from TCWS #1 to #5) that allows for the escalation, de-escalation or lifting of wind signals in every TCB issuance depending on the tropical cyclone wind intensity, the extent of tropical cyclone winds (i.e. radius of tropical cyclone wind circulation) and the forecast direction and speed of movement of the ...
Within this warning system, an area having a wind signal may be under: TCWS #1 - Tropical cyclone winds of 39–61 km/h are prevailing or expected within the next 36 hours. TCWS #2 - Tropical cyclone winds of 62–88 km/h are prevailing or expected within the next 24 hours.
Strong Wind (強風) No. 3 signal is a warning that a tropical cyclone is expected to come near enough to Hong Kong to cause strong winds in Hong Kong. Strong winds range from 41 to 62 kilometres per hour, but gusts may exceed 110 kilometres per hour. The signal normally gives about 12 hours warning of strong winds over Hong Kong at sea level. 8NW
Within the region a tropical cyclone is defined as being a non-frontal low-pressure system of synoptic scale that develops over warm waters, with a definite organized wind circulation and 10-minute sustained wind speeds of 34 kn (63 km/h; 39 mph) or greater near the centre. [28]
Signal #5 – Tropical cyclone winds of 185 km/h (115 mph) or greater are expected within 12 hours. These warning signals are usually raised when a locality is about to be hit by a typhoon. As it gains strength and/or gets nearer to an area having a storm signal, the warning may be upgraded to a higher one for that particular area.
It is the strongest landfalling tropical cyclone on record by 1-minute maximum sustained winds. The name "Goni" means swan in Korean. The nineteenth named storm, ninth typhoon, and second super typhoon of the 2020 Pacific typhoon season, Goni originated as a tropical depression south portion of Guam on October 26.
Rai was a powerful rare tropical cyclone that struck the Philippines in December 2021. Rai became the first Category 5 -equivalent super typhoon to develop in the month of December since Nock-ten in 2016, and the third of four Category 5 super typhoons recorded in the South China Sea, along with Pamela in 1954, Rammasun in 2014 and Yagi in 2024.
As the storm began its phase of rapid intensification and began tracking closer to the Philippines, PAGASA began raising Tropical Cyclone Wind Signals (TCWS) for parts of northern Luzon. [45] Expecting rough weather and a transport strike protesting the 2023 State of the Nation Address , classes in public schools and work in government offices ...