Report on Super Typhoon Man-yi (2424)
Super Typhoon Man-yi (2424)
9 – 19 November 2024
Man-yi was the seventh tropical cyclone affecting Hong Kong in 2024. Following tropical cyclones Yinxing and Toraji, Man-yi necessitated the issuance of tropical cyclone warning signal for the third time in November, the first time since 1946.
Man-yi formed as a tropical depression over the western North Pacific about 1 840 km east of Guam in the small hours of 9 November, moved west-northwestwards, and intensified into a tropical storm that day. It turned to adopt a west-southwesterly track across the seas near Guam in the following four days. It turned gradually from moving westwards to northwestwards towards Luzon on 14 – 16 November. Man-yi intensified into a super typhoon in the small hours of 16 November and attained its peak intensity with an estimated maximum sustained wind of 220 km/h near its centre that morning. It moved across Luzon on 17 November, entered the central part of the South China Sea, and weakened rapidly. It then moved generally west-northwestwards across the northern part of the South China Sea the next day. Man-yi gradually turned to track west-southwestwards on the afternoon of 19 November and finally weakened into an area of low pressure over the seas southeast of Hainan Island in the small hours of 20 November.
According to press reports, Man-yi brought heavy rain and squalls to the Philippines, resulting in flooding and severe damage in many places. It caused many fallen trees, damaged houses and many casualties.
The Standby Signal No. 1 was issued at 6:40 a.m. on 18 November, when Man-yi was about 660 km southeast of Hong Kong. Local winds were moderate to fresh north to northeasterlies, occasionally strong offshore and on high ground that night and the next day. Man-yi came closest to Hong Kong at around 8 a.m. on 19 November, skirting past about 370 km south of the territory. With Man-yi departing from Hong Kong and weakening, it no longer posed a threat to Hong Kong and all tropical cyclone warning signals were cancelled at 10:10 p.m. on 19 November.
A fresh to strong northeast monsoon affected Hong Kong on 18 November and there were sunny intervals that day. There were also a few light rain patches with the approach of Man-yi. Under the combined effects of a spring tide, northeast monsoon and Man-yi, water levels in Hong Kong were particularly high on the night of 18 November. The water levels of Quarry Bay, Tai O and Tai Po Kau reached 3.36, 3.36 and 3.52 metres above the Chart Datum respectively and they were all the highest on record for November. Minor flooding occurred in some low-lying areas including the banks of Shing Mun River, Lei Yue Mun, Tai O and Sha Tau Kok. Under the influence of the northeast monsoon and the outer rainbands associated with Man-yi, the local weather was gloomy and rainy on 19 November.