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TC Watch / 熱帶氣旋 > Selected TC Review / 重要熱帶氣旋回顧 > 202412W (YAGI 摩羯) [Refresh 更新]

202412W (YAGI 摩羯) - Profile 檔案

(First draft issued on September 15, 2024, final version issued on January 12, 2025)
(初稿於 2024 年 9 月 15 日發出，最後版本於 2025 年 1 月 12 日上載)

Brief profile of YAGI | 摩羯小檔案:

^Refers to the period between the HK Observatory's first and last bulletins for the tropical cyclone (with at least tropical depression intensity). For storms formed/dissipated/transformed into an extratropical cyclone outside the area bounded by 7-36°N and 100-140°E, information from the JTWC will be used instead.
^即香港天文台為該熱帶氣旋（熱帶低氣壓級或更高）作出發佈的時期。至於在北緯 7 至 36 度、東經 100 至 140 度外形成／消散／轉化為溫帶氣旋的風暴，本網將參考聯合颱風警報中心的資料。

*The maximum strength estimated in live bulletins was 130 knots (Category 4 Super Typhoon).
*實時發佈中的最高強度為 130 節（四級超級颱風）。

TC signals in Hong Kong* 香港曾經生效的熱帶氣旋警告*:

Signal 信號	Date and time 日期和時間	Distance from HK 與香港的距離	Predicted movement 預測移動趨勢	Max. 10-min winds 中心最高十分鐘平均風速
	2024/09/03 (TUE) 17:40 HKT	SE 630 km	NW at 10 km/h	90 km/h (50 knots, STS)
	2024/09/04 (WED) 18:40 HKT	SE 460 km	W at 10 km/h	165 km/h (90 knots, ST)
	2024/09/05 (THU) 18:20 HKT	S 340 km	WNW at 15 km/h	210 km/h (115 knots, SuT)
	2024/09/06 (FRI) 12:40 HKT	SW 410 km	WNW at 18 km/h	230 km/h (125 knots, SuT)
	2024/09/07 (SAT) 04:20 HKT**	WSW 600 km	WNW at 18 km/h	185 km/h (100 knots, SuT)

*Based on the information from real-time tropical cyclone warning bulletins.
*根據實時熱帶氣旋警報資料。

**The Strong Monsoon Signal was issued at 04:21 HKT.
**強烈季候風信號於上午 4 時 21 分發出。

Percentile Ranks 百分等級:

IR imagery animation 紅外線雲圖動畫:

TC track from HKWW 本站的熱帶氣旋路徑圖:

TC track(s) from HKO 天文台的熱帶氣旋路徑圖:

Past HKWW Bulletins 本站發佈

Please click here for bulletins on this tropical cyclone. 請按這裡。

Storm Development Overview 風暴發展概覽

Unless otherwise stated, all times below are in Hong Kong Standard Time (UTC+8)
除非特別註明，下文時間均為香港標準時間（協調世界時加 8 小時）

In late August, an area of low pressure formed to the east of the Philippines. It was designated as tropical disturbance 92W by the JTWC. On September 1, 92W showed signs of intensification. The JTWC issued a tropical cyclone formation alert, while the JMA issued a gale warning that morning. In the afternoon, the NMC of China and the HKO upgraded 92W into a tropical depression. The JTWC followed suit that night, giving it the storm number 12W, while the JMA upgraded 12W into tropical storm status and named it YAGI.

At the time of YAGI's formation, it was moving northwest under the combined influence of the subtropical ridge to its east and a continental ridge anchored in China. Although it was expected to move north-northwest in the short run along the eastern coast of the Philippines, numerical models showed some disagreement on YAGI's future path. Some models predicted the continental ridge to dominate, causing YAGI to turn westwards and move into the South China Sea. Others predicted that Yagi would continue to move north towards Taiwan or the seas east of Taiwan. However, as time passed, more model outcomes were in favour of the former scenario.

YAGI's convections were initially displaced to the west and development was limited due to its proximity to land. It made landfall in the eastern Luzon province of Aurora in the afternoon of September 2 as a tropical storm. The centre of the storm appeared to turn northwest and cross Luzon, while a patch of convections re-developed in the South China Sea west of the Philippines.

YAGI further turned west-northwest and entered the South China Sea early on September 3. Its circulation expanded in size and its core convections tightened as the storm intensified into a severe tropical storm. Although virtually all models agreed that YAGI would move across northern South China Sea by that point, there was some uncertainty in the direction of movement. Landfalls in Hainan Island, Leizhou Peninsula or further east in western Guangdong were all depicted.

On September 4, YAGI intensified into a typhoon and developed a central dense overcast. In the extremely warm South China Sea with temperatures in excess of 30 degrees, YAGI underwent rapid intensification. By early September 5, YAGI had developed a clear eye with eyewall cloud-top temperatures reaching -70 degrees and below. The estimated intensity by the JTWC increased from 70 knots (130 km/h) at 8 am September 4 to 130 knots (241 km/h) in the live bulletin at 8 am September 5. The latter intensity was revised upwards to 140 knots (259 km/h) after re-assessment, making YAGI the first category-5-equivalent super typhoon in the South China Sea since RAI in December 2021. The HKO mentioned that YAGI went from a severe tropical storm to a super typhoon during September 4 Hong Kong Time.

YAGI was moving slowly westwards due to the competing steering influence from the continental ridge to the north and an equatorial ridge to the south. It underwent an eyewall replacement cycle on September 5, which saw a temporary decrease in its intensity as its northern eyewall shrank and weakened. However, the storm regained strength later that day and early on September 6. Its eye appeared clearer than before and the central dense overcast expanded in size. The JTWC estimated its intensity as 135 knots (250 km/h) at this second peak, lower than the first one. However, other agencies generally assessed the same or a higher intensity at the second peak. The maximum intensities estimated by the NMC, HKO, JMA and CWA (Taiwan) were 68 m/s (245 km/h), 230 km/h, 105 knots (194 km/h) and 58 m/s (209 km/h), respectively.

In the morning of September 6, YAGI accelerated and started to move west-northwest in response to a developing ridge east of the storm. It weakened slightly prior to its landfall in Wenchang, Hainan at around 3:20 pm. Nevertheless, at 62 m/s (223 km/h), the NMC reported YAGI as the strongest typhoon to make landfall in China in autumn (September to November) and the second strongest since 1949, after RAMMASUN in 2014 which also happened to make landfall in Wenchang. There were reports that YAGI's eye passed the No. 1 buoy near Hainan at 1 pm September 6, recording a minimum sea-level pressure of 916 hPa and a maximum 10-minute average wind speed of 46.9 m/s (169 km/h).

YAGI's eye shrank as the storm made its way across northern Hainan. It made a direct hit at Haikou between 7 and 8 pm. The NMC's estimated intensity was 60 m/s (216 km/h). A record-breaking pressure reading of 925 hPa, corresponding to a sea-level pressure of around 932 hPa, was observed at Haikou at 8 pm. Around 2 hours later, at 10:20 pm, the NMC said that YAGI made another landfall at Xuwen, Guangdong, which is on the opposite side of the Qiongzhou Strait.

YAGI entered the Gulf of Tonkin before midnight September 7, still moving west-northwest. Its core restructured while crossing the Gulf, and it made a final landfall near Ha Long, Vietnam, at around 3:30 pm. Both the NMC and HKO estimated YAGI to still be a super typhoon (with winds in excess of 180 km/h) at this time. Upon its landfall in northern Vietnam, YAGI began to weaken rapidly. It crossed Hanoi that night as a typhoon, and continued its way across northern Vietnam. It weakened into an area of low pressure on September 8. YAGI resulted in severe damage in Vietnam, with more than 280 deaths in the country. Floods caused by its remnants affected Laos and Myanmar, killing more than 400.

8 月下旬，一個低壓區於菲律賓以東形成，被聯合颱風警報中心（聯颱中心）編為熱帶擾動 92W。9 月 1 日，92W 有跡象發展，早上聯颱中心發佈熱帶氣旋形成警報，而日本氣象廳則發出烈風警告。當天下午，中國中央氣象台及香港天文台將 92W 升格為熱帶低氣壓。聯颱中心當晚跟隨，並給予風暴編號 12W。日本氣象廳更將其升格為熱帶風暴，命名為摩羯。

摩羯形成初時受東面副熱帶高壓脊及位於中國的大陸高壓脊的共同影響。雖然預料它於短期內向西北偏北移動並橫過菲律賓沿岸海域，但數值模式對於風暴其後的路徑出現分歧。部分模式預料大陸高壓脊將成為主導，令摩羯西轉並移入南海，而其他模式則預料摩羯會繼續北移至台灣及台灣以東海域。隨著時間過去，較多模式偏向作出前者進入南海的預報。

摩羯的對流初時偏離至其西面，風暴因靠近陸地而發展受阻。它於 9 月 2 日下午以熱帶風暴強度登陸呂宋東部的奧羅拉省。風暴的中心似乎轉向西北移動並橫過呂宋，而一團對流於菲律賓以西的南海中重新發展。

9 月 3 日早段，摩羯進一步轉向西北偏西移動，並進入南海。摩羯的對流有所擴展，核心環流變得緊密，它增強為強烈熱帶風暴。此刻幾乎所有數值模式均預測摩羯將橫過南海北部，但其移動方向仍有一定變數，登陸海南、雷州半島及其東面的廣東西部均可能發生。

9 月 4 日，摩羯增強為颱風並發展出中心密集雲區。南海當時非常溫暖，海溫超過 30 度，摩羯得以快速增強。至 5 日，摩羯已發展出清晰的風眼，而眼牆雲頂溫度跌至 -70 度以下。聯颱中心估算的強度由 4 日上午 8 時的 70 節（每小時 130 公里）上升至 5 日上午 8 時的 130 節（每小時 241 公里）。後者其後被重新評估並上調為 140 節（每小時 259 公里），令摩羯成為自 2021 年 12 月雷伊以來首個於南海達到相當於五級強度的超級颱風。香港天文台表示摩羯於香港時間 4 日由強烈熱帶風暴逐漸增強為超強颱風。

當時摩羯正受北面大陸高壓脊及南面赤道高壓脊的共同影響，兩脊流場部分抵銷令風暴緩慢西移。它於 9 月 5 日經歷一次眼牆置換週期，其北面眼牆縮小並減弱，風暴強度短暫下降。但是，當天稍後及 6 日摩羯重新增強，其風眼比之前更為清晰，中心密集雲區亦有所擴大。聯颱中心估算其第二次巔峰強度為 135 節（每小時 250 公里），較第一次巔峰強度低。但是，其他機構大多評估摩羯第二次巔峰強度等於或高於其第一次巔峰強度。中央氣象台、香港天文台、日本氣象廳及台灣中央氣象署的估計分別為每秒 68 米（每小時 245 公里）、每小時 230 公里、105 節（每小時 194 公里）及每秒 58 米（每小時 209 公里）。

隨著高壓脊於摩羯以東增強，風暴於 9 月 6 日早上加速並開始向西北偏西移動。它略為減弱，並於下午 3 時 20 分左右登陸海南文昌。中央氣象台表示，摩羯登陸時中心風力仍達每秒 62 米（每小時 223 公里），成為自 1949 年以來於秋天（9 至 11 月）登陸中國的最強颱風，全年計則是第二強的登陸颱風，僅次於 2014 年同樣登陸文昌的威馬遜。另外，有消息指摩羯的風眼於 6 日下午 1 時經過於海南附近的南海一號浮標，錄得最低海平面氣壓為 916 百帕，最高 10 分鐘持續風速為每秒 46.9 米（每小時 169 公里）。

摩羯的風眼於橫過海南北部期間縮小。風暴於下午 7 至 8 時直趨海口，中央氣象台估計當時風暴強度為每秒 60 米（每小時 216 公里）。海口於下午 8 時錄得 925 百帕的破紀錄氣壓，換算至海平面氣壓約為 932 百帕。約兩小時後，中央氣象台表示摩羯再度登陸位於瓊州海峽對岸的廣東徐聞。

摩羯於 9 月 7 日午夜前進入北部灣，仍然向西北偏西移動。風暴的核心於通過北部灣時重新整合，最終於下午約 3 時 30 分登陸越南下龍一帶。中央氣象台及香港天文台均估計摩羯登陸時仍然是一個超強颱風，風力超過每小時 180 公里。登陸越南後，摩羯快速減弱。它當晚以颱風級別橫過河內，其後橫過越南北部，最後於 8 日減弱為低壓區。摩羯於越南造成嚴重破壞，至少 280 人死亡，而其殘餘於老撾及緬甸釀成洪災，造成超過 400 人死亡。

Weather in Hong Kong During Approach 風暴影響時香港天氣狀況

Link to relevant HKO weather report bulletins: 3/9 ● 4/9 ● 5/9 ● 6/9 ● 7/9
香港天文台相關天氣報告連結： 3/9 ● 4/9 ● 5/9 ● 6/9 ● 7/9

Under the influence of the continental ridge, it was fine in Hong Kong before YAGI's approach. As early as September 2, before YAGI entered the South China Sea, the HK Observatory had already mentioned the possibility of YAGI moving towards western Guangdong and Hainan Island, and that the #1 Standby Signal would be considered in the afternoon to nighttime the next day.

Affected by YAGI's subsidence, it was very hot with light winds and some haze on September 2 and 3, with the temperature reaching 34.2 degrees at the Observatory on September 2. As expected, the #1 Standby Signal was issued at 5:40 pm on September 3, when YAGI was a severe tropical storm at around 630 km southeast of Hong Kong. Prior to the issuance of the #1 Signal, the HKO had mentioned that it would be likely for the #3 Strong Wind Signal to be issued.

The hot weather triggered convective activities in southern China in the night of September 3. At around 10 pm, an intense rainband approached Hong Kong from the northeast. More than 30 mm of rain was recorded in some parts of the territory, and the Amber Rainstorm Warning was in force between 10:25 pm and 11:50 pm. Over 2,000 cloud-to-ground lighting strikes were detected over Hong Kong that night.

There were sunny periods on September 4. At 8:45 am, the Observatory announced that the #3 Strong Wind Signal would be considered between 6 pm and 9 pm that night. The Signal was eventually issued at 6:40 pm, at which point YAGI had moved to about 460 km southeast of Hong Kong as a severe typhoon. At the time of the signal change, the Observatory indicated that it might need to issue higher signals in the afternoon to nighttime of September 5 if YAGI were to move according to the forecast track and continued to intensify. This sent a strong signal to the public that the #8 Signal would quite likely be needed, even though the storm was forecast to remain more than 300 km away from Hong Kong.

In the small hours of September 5, east to northeasterly winds strengthened at offshore and elevated stations. At 7:45 am, the Observatory mentioned that the gales associated with YAGI would edge closer to the Pearl River Estuary later that day, and that the #8 Gale or Storm Signal would be considered between 4 pm and 7 pm. Four hours later, the time of the signal upgrade was confirmed to be 6:20 pm; this marked the first time that the exact time of the issuance of the #8 Signal was made clear to the public more than 6 hours before. Around noon, the Government Flying Service sent dropsondes near YAGI's centre to collect meteorological data about the storm. A near-ground wind speed in excess of 160 km/h and a minimum pressure of 930.5 hPa at 31 metres above sea level were recorded.

The handling of cargoes was generally suspended at noon September 5. Various schedules to suspend public transport services were announced during the afternoon. High-speed jetfoil services between Hong Kong and Macau were suspended after 3 pm, while local ferry services generally lasted until 7 to 8 pm. In anticipation of the rise in commuter traffic before the evening rush hour, the MTR increased services gradually from 3 pm. The Education Bureau announced that the classes of all day and night schools would be suspended following the Pre-No. 8 Special Announcement, and that day schools would remain suspended on Friday.

Strong force winds were more consistently observed at offshore and elevated stations in the afternoon. There were some showers but they did not last long, and there was still sunshine as the winds strengthened. Sustained gales were first observed at Ngong Ping, an elevated station, after 3 pm. An hour later, gales were also observed at Waglan Island. At 4:20 pm, the Observatory issued the Pre-No. 8 Special Announcement to give the usual 2-hour notice. In the tropical cyclone bulletin issued at 4:45 pm, the Observatory said that the gales associated with YAGI were still expected to affect the vicinity of the Pearl River Estuary the next morning, and that the #8 Signal would remain in force at least until noon September 6. This meant many employees would get a half-day "typhoon holiday", and it was the first time the Observatory gave such an advance notice before the issuance of the #8 Signal.

The Observatory promptly issued the #8 Northeast Gale or Storm Signal at 6:20 pm. YAGI was about 340 km south of Hong Kong at that time, and continued to move west. In addition to Ngong Ping and Waglan Island, locations such as Cheung Chau Beach, Green Island and Tate's Cairn were also observing gale force winds near the time of the signal change. Winds continued to pick up in the several hours after sunset; the Observatory upgraded the local wind forecast to up to force 10 in offshore locations and on high ground. A major rainband approached the territory at around 10 pm; the Amber Rainstorm Warning was again issued at 9:30 pm, and lasted for more than two hours. The strongest winds during YAGI's approach were generally observed at that time. Hong Kong Sea School, Peng Chau, Tai Mei Tuk and Tap Mun were also affected by gale force winds, while sustained storm force winds of up to 116 km/h were registered at Ngong Ping before 11 pm. Between 10:10 pm and 10:20 pm, maximum gusts reached 139 km/h at Central Pier and 102 km/h at Kowloon Star Ferry Pier. YAGI was closest to Hong Kong during these few hours, passing to the south at a distance of around 330 km.

As YAGI failed to gain latitude overnight, easterly winds continued to prevail. The arrival of another rainband prompted the Observatory to issue the Amber Rainstorm Warning at 2:35 am September 6, the third time during YAGI's approach; it was cancelled at 4:25 am. By daybreak, YAGI had moved to about 400 km south-southwest of Hong Kong, and it became apparent that winds would not strengthen further. At 9:45 am, the Observatory indicated that the #3 Strong Wind Signal would be issued at 12:40 pm, replacing the #8 Northeast Gale or Storm Signal. Public services gradually resumed as employees returned to work in the afternoon. However, banks and the stock exchange remained closed for the day; this marked the last time that the securities market was closed due to adverse weather conditions, before a change of the rules on September 23 that would allow the market to remain open.

Throughout the afternoon of September 6, squally showers occasionally affected Hong Kong and winds remained rather strong especially in the southern parts of the territory. The rain turned heavy in eastern Hong Kong at around 7 pm. The Amber Rainstorm Warning was issued another time at 7:15 pm, which lasted more than five hours. An intense convective cell was spotted east of Hong Kong on radar images and the Observatory mentioned the possibility of a waterspout there at 7:10 pm. No actual report was received, however. The subsequent rainbands resulted in another surge in wind speeds over the territory. A maximum sustained wind speed of 80 km/h was recorded at Cheung Chau near 8:40 pm, the highest during YAGI's passage.

Winds eventually turned southeast in the small hours of September 7 and weakened. The Observatory cancelled the #3 Strong Wind Signal at 4:20 am and issued the Strong Monsoon Signal one minute later. It was cancelled at 12:45 pm the same day as winds moderated to below strong force level. A few showers affected Hong Kong that day; more than 100 mm of rain was recorded on September 7 in parts of the northern New Territories.

During YAGI's approach, the government received 119 reports of fallen trees, one flooding and one landslide report. Nine people received treatment at the Accident and Emergency Department of public hospitals for typhoon-related injuries. The Observatory's practice of giving an ample lead time before the issuance and cancellation of the #8 Signal was generally praised by the public. However, this had also led to concerns over the Observatory's flexibility to respond to unexpected changes. In a radio programme, Mr. Leung Wing-mo, former Assistant Director of the Observatory, explained that YAGI's track was stable with little uncertainty, which allowed the Observatory to give advance warnings. He reminded the public not to expect that such forecasts could be made hours ahead every time a cyclone approached Hong Kong.

由於大陸高壓脊盤踞華南，摩羯來襲前香港天色明朗。9 月 2 日，香港天文台於摩羯進入南海前已表示風暴較大機會移向廣東西部至海南島一帶，並會考慮於翌日下午至晚上發出一號戒備信號。

受摩羯的下沉氣流影響，9 月 2 及 3 日天氣酷熱並吹微風，天文台於 2 日錄得氣溫達 34.2 度。一如預期，一號戒備信號於 3 日下午 5 時 40 分發出，當時摩羯達強烈熱帶風暴級，位於香港東南約 630 公里。一號信號發出前，天文台已指出需要發出三號強風信號的機會較高。

9 月 3 日晚上，酷熱天氣於華南觸發對流活動。下午約 10 時，一道強雨帶從東北面靠近香港，多區錄得超過 30 毫米雨量，黃色暴雨警告於下午 10 時 25 分至 11 時 50 分期間生效。當晚天文台於境內錄得超過二千次雲對地閃電。

9 月 4 日，本港部分時間有陽光。上午 8 時 45 分，天文台表示將考慮於下午 6 至 9 時發出三號強風信號。該信號最終於下午 6 時 40 分發出，摩羯當時已移至香港東南約 460 公里，強度為強颱風級。發出三號信號之時，天文台指出若摩羯按預測路徑移動及繼續增強，有可能需要於 5 日下午至晚上改發更高信號。雖然預料摩羯會於香港 300 多公里外掠過，但此舉令市民相信發出八號信號的機會頗高。

本港離岸及高地東至東北風於 9 月 5 日凌晨有所增強。上午 7 時 45 分，天文台表示與摩羯相關的烈風區會在當天稍後靠近珠江口，將考慮於下午 4 至 7 時發出八號信號。四小時後，改發信號時間確定為下午 6 時 20 分，而這是天文台首次於改發八號信號前超過 6 小時通知市民有關信息。中午時份，政府飛行服務隊利用下投式探空儀，於摩羯的中心附近搜集氣象數據，錄得近地面風速超過每小時 160 公里，離海面約 31 米的最低氣壓為 930.5 百帕斯卡。

貨櫃交收服務普遍於 9 月 5 日正午暫停，而下午各公共運輸機構宣佈將於稍後暫停服務。其中，來往香港及澳門的高速船於下午 3 時後停航，本地航線則普遍繼續運行至下午 7 至 8 時。由於預料乘客量將於正常下午繁忙時間前增加，港鐵於下午 3 時起逐步增加班次。教育局宣佈所有日、夜校將於預警八號信號特別報告發出後停課，而日校週五亦將停課。

9 月 5 日下午，離岸及高地站強風變得較為持續。本港間中有驟雨，但維持時間短暫，風勢增強期間更可見到陽光。下午 3 時過後，位處高地的昂坪首先錄得持續烈風。一小時後，橫瀾島亦開始吹烈風。下午 4 時 20 分，天文台發出預警八號熱帶氣旋警告信號之特別報告，給予市民兩小時預警。在下午 4 時 45 分的熱帶氣旋警報中，天文台指摩羯相關的烈風區在翌日早上仍然會影響珠江口一帶，八號信號將至少維持至 6 日正午。這是天文台首次提早大半天、在未發出八號信號時已令市民得知會有多半日「風假」。

天文台準時於下午 6 時 20 分發出八號東北烈風或暴風信號。摩羯位於香港以南約 340 公里，並繼續向西移動。除昂坪及橫瀾島外，長洲泳灘、青洲及大老山亦於改發八號信號前後錄得烈風風速。日落後數小時風勢繼續增強，天文台將離岸及高地風力預測上調至間中達 10 級。一道主要雨帶於下午約 10 時靠近本港，黃色暴雨警告於下午 9 時 30 分再度發出，並生效超過兩小時，期間普遍錄得摩羯襲港時最高風速。香港航海學校、坪洲、大美督及塔門均吹烈風，而昂坪持續風速更於下午 11 時前達每小時 116 公里的暴風程度。下午 10 時 10 至 20 分，中環碼頭及九龍天星碼頭分別錄得每小時 139 及 102 公里的陣風。摩羯該數小時最接近香港，於南面約 330 公里掠過。

由於摩羯整晚並未北移，本港繼續吹東風。另一道雨帶到來令天文台於 9 月 6 日上午 2 時 35 分第三次發出黃色暴雨警告，該警告於上午 4 時 25 分取消。至破曉時份，摩羯移至香港西南偏南約 400 公里，基本肯定本港風勢不會進一步增強。上午 9 時 45 分，天文台表示三號強風信號將於下午 12 時 40 分發出，取代八號東北烈風或暴風信號。下午市民陸續上班，公共服務逐漸恢復，但銀行及股票市場全日暫停服務及交易。這是「惡劣天氣不停市」安排於 9 月 23 號生效之前證券市場最後一次因天氣原因暫停運作。

狂風驟雨於 9 月 6 日下午間中影響香港，本地風勢仍然頗強，尤其是南部地區。本港東部雨勢於下午 7 時轉大，黃色暴雨警告於下午 7 時 15 分再度發出，今次更持續超過 5 小時。雷達圖上，香港以東海域出現一個猛烈對流區，天文台表示下午 7 時 10 分左右西貢以東海面可能有水龍捲，但最終並未接獲相關報告。當晚的雨帶令本港風力有所上升，長洲更於下午約 8 時 40 分錄得持續風速達每小時 80 公里，是摩羯襲港期間的最高。

9 月 7 日凌晨，風向終於轉向東南並有所緩和。天文台於上午 4 時 20 分取消三號強風信號，一分鐘後發出強烈季候風信號。風勢其後跌至強風水平以下，強烈季候風信號於下午 12 時 45 分取消。當日香港繼續受驟雨影響，新界北部部分地區於 7 日共錄得超過 100 毫米雨量。

摩羯襲港期間，天文台接獲 119 宗塌樹、1 宗水浸及 1 宗山泥傾瀉報告。9 人於風暴期間受傷並於公共醫院急症室接受治療。天文台於發出及取消八號信號前提供充足預警普遍獲市民讚賞，但亦有人關注此舉會否令天文台處理突發情況時缺乏彈性。天文台前助理台長梁榮武於一個電台節目中指出，摩羯的路徑穩定且沒有太大懸念，因此能提早作出預告，但提醒市民不要期望每次都可以做到這樣的提示。

Image Gallery 圖片庫

Figure 1 - GFS (top left) and ECMWF (top right) ensemble forecasts at 8 am August 31; Multi-model forecast at 8 am September 2 (bottom) [Source: Tropical Tidbits; Easterlywave; Typhoon2000]
圖 1 - 8 月 31 日上午 8 時 GFS（左上）及 ECMWF（右上）模式集成預報；9 月 2 日上午 8 時多模式預報（下）[來源：Tropical Tidbits; Easterlywave; Typhoon2000]

Figure 2 - Steering flow chart at 8 am September 2
圖 2 - 9 月 2 日上午 8 時之駛流場分佈圖

Figure 3 - Forecast tracks from various official agencies on September 2 (left) and September 5 (right)
圖 3 - 9 月 2 日（左）及 5 日（右）各官方氣象台之預測路徑圖

Figure 4 - Radar image at 10:36 pm September 3
圖 4 - 9 月 3 日下午 10 時 36 分之雷達圖

Figure 5 - Wind field analysis at 9:50 pm September 4
圖 5 - 9 月 4 日下午 9 時 50 分之風場掃描圖

Figure 6 - Satellite images of YAGI when its intensity reached the first (left) and second (right) peaks
圖 6 - 摩羯強度達到第一次（左）及第二次（右）高峰時之衛星雲圖

Figure 7 - JTWC (top) and HKO (bottom) track forecasts at 8 pm September 5
圖 7 - 9 月 5 日下午 8 時聯合颱風警報中心（上）及香港天文台（下）之路徑預測

Figure 8 - Maximum gusts recorded between 10:10 pm and 10:20 pm September 5 (left) and the radar image at that time (right). One of YAGI's major rainbands was affecting Hong Kong at that time.
圖 8 - 9 月 5 日下午 10 時 10 分至 10 時 20 分之最高陣風（左）及當時之雷達圖（右），顯示摩羯一條主要雨帶正影響香港

Figure 9 - Radar images at 6-hour intervals from 10 am September 5 to 4 pm September 6
圖 9 - 9 月 5 日上午 10 時至 6 日下午 4 時每六小時之雷達圖

Figure 10 - Local weather element distribution maps at 6-hour intervals from 4 pm September 5 to 10 pm September 6 (strong winds or above are represented by red wind barbs)
圖 10 - 9 月 5 日下午 4 時至 6 日下午 10 時每六小時之本港天氣元素分布圖 (強風或以上風速以紅色風矢標示)

Figure 11 - Wind speed time series at Cheung Chau, Ngong Ping, North Point, Peng Chau and Waglan Island (top to bottom) between noon September 5 and midnight September 7
圖 11 - 長洲、昂坪、北角、坪洲及橫瀾島（上至下）於 9 月 5 日正午至 7 日午夜之風速時間序列圖

Figure 12 - Radar images showing YAGI's structure just before making landfall at Hainan Island (left) and while it crossed Haikou (right)
圖 12 - 雷達圖顯示摩羯登陸海南島前（左）及橫過海口時（右）的結構

Figure 13 - Daily rainfall distribution maps for September 6 (left) and September 7 (right)
圖 13 - 9 月 6 日（左）及 7 日（右）之雨量分佈圖

Figure 14 - Radar image showing intense convective activities in the seas east of Hong Kong at 7 pm September 6
圖 14 - 雷達圖顯示 9 月 6 日下午 7 時香港以東海域有猛烈對流活動

Winds Recorded at Reference Stations 參考站所錄得的風速

The following table lists the maximum 10-minute average (sustained) wind speed recorded while tropical cyclone signals were in force. In some occasions, it is possible that the strongest winds were not recorded when the highest signal was in force.

下表列出各站於熱帶氣旋警告信號生效時所錄得的最高 10 分鐘平均（持續）風速，留意此風速不一定於最高信號生效期間錄得。

*The anemometer at Chek Lap Kok was relocated to the new North Runway (third runway) on March 25, 2024. [HKO announcement]
*赤鱲角的風速計自 2024 年 3 月 25 日起遷移至新北跑道（第三跑道）。[香港天文台相關公佈]

Charts and Figures 各項數據

Table 1: Track data from HKWW:
表一 : 香港天氣觀測站之路徑資料

Table 2: Maximum gust and hourly average wind speed recorded in Hong Kong from HKO:
表二 : 香港天文台公佈的各站最高每小時平均風力和陣風數據 (英文)

Table 3: Rainfall (in millimetres) contributed by YAGI from HKO (figures in brackets are based on incomplete hourly data):
表三 : 香港天文台公佈的各站雨量資料 (英文) (方括號內之數據由不完整之每小時資料擷取)

Last Accessed 最近訪問日期: Sat Mar 22 2025 15:07:30 HKT
Last Modified 最近修訂日期: Sun Jan 12 2025