TC Watch / 熱帶氣旋 > Selected TC Review / 重要熱帶氣旋回顧 > 202617W (SAUDEL 沙德爾) [Refresh 更新]
 202617W (SAUDEL 沙德爾) - Profile 檔案 |
(First draft issued on September 12, 2026)
(初稿於 2026 年 9 月 12 日發出)
Brief profile of SAUDEL | 沙德爾小檔案:
| JTWC number 聯合颱風警報中心號碼 | 17W |
| International number 國際編號 | 2618 |
| Period of existence 生存時期^ | 2026/08/18 20 HKT - 2026/08/30 02 HKT (in NW Pacific and China 於西北太平洋及中國) 2026/08/31 17 HKT - 2026/09/03 20 HKT (in South China Sea and China 於南海及中國) |
| Estimated maximum 1-minute wind (JTWC) 聯合颱風警報中心估計一分鐘平均最高中心風速 |
(In NW Pacific 於西北太平洋) (In South China Sea 於南海) |
Estimated maximum 10-minute wind (HKO) |
(In NW Pacific 於西北太平洋) (In South China Sea 於南海) |
| Highest TC signal by HKO 香港天文台發出最高熱帶氣旋警告信號 |
1 (Standby Signal 戒備信號) |
| Closest point of approach by HKO 香港天文台所示之最接近距離 |
Real-time warning 實時報告: SE 240 km | 東南 240 公里 |
| Time of closest approach by HKO 香港天文台所示之最接近時間 |
Real-time warning 實時報告: 2026/09/01 22 HKT |
| Lowest pressure recorded at HKO 香港天文台錄得的最低氣壓 |
TBA 稍後公佈 |
^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。
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 |
 |
2026/08/31 (MON) 18:10 HKT | SW 520 km | E/ENE at 22 km/h | 45 km/h (25 knots, TD) |
 |
2026/09/04 (FRI) 00:10 HKT | NNE 260 km | WSW at 12 km/h | 40 km/h (20 knots, LPA) |
*Based on the information from real-time tropical cyclone warning bulletins.
*根據實時熱帶氣旋警報資料。
百分等級只適用於曾令天文台發出三號強風信號 (或更高) 的熱帶氣旋。
IR imagery animation 紅外線雲圖動畫:
TC track(s) 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:
TBA 稍後公佈
| 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）
SAUDEL formed as a tropical depression near Chuuk on August 18. Steered by the subtropical ridge, SAUDEL moved north-northwest initially as it gradually intensified. It underwent a period of rapid intensification on August 22; the HKO noted that it reached super typhoon strength on August 23. At the same time, SAUDEL turned northwest and later west-northwest as it weakened and approached the Ryukyu Islands on August 25. The storm slowed down on August 26 as it passed south of a weakness between the continental and Pacific ridges, and turned west to west-southwest towards southeastern China.
After making landfall in southern Zhejiang on August 28, SAUDEL tracked inland into Fujian, Jiangxi and Hunan provinces in the next two days. It weakened gradually into a low pressure area, and turned southwards early on August 30 towards eastern Guangxi. In the small hours of August 31, SAUDEL's remnants entered northern South China Sea near Zhanjiang, Guangdong.
Together with tropical disturbance 97W near the Taiwan Strait, the two systems formed a broad area of low pressure in the northern parts of the South China Sea. The JMA issued a gale warning at 8 am August 31 as SAUDEL's convections gathered. SAUDEL continued to dip south towards eastern Hainan; both the NMC and HKO upgraded the system into a tropical depression at 5 pm. Situated in the northern side of the equatorial ridge, SAUDEL was expected to move east-northeast and later track anticlockwise along the periphery of the broad area of low pressure affecting southern China at that time.
Affected by moderate vertical wind shear, SAUDEL's convections were displaced to the west when it re-intensified into a tropical depression. It gathered strength in the night of August 31, and the JMA upgraded it into a tropical storm at 2 am September 1. The name SAUDEL was kept as it was deemed the same system as the one that made landfall in eastern China earlier. SAUDEL moved east-northeast quickly during the day, and convections developed near its centre with its low-level circulation centre clearly visible.
SAUDEL slowed down gradually later on September 2. Intense convections developed north of its centre at night; the NMC revised its estimated intensity upwards from 18 m/s (65 km/h) to 23 m/s (83 km/h) at 10 pm. It turned northwest in the small hours of September 3 and a solid core could be seen developing near the centre. The NMC upgraded SAUDEL into a severe tropical storm at 5 am, while other agencies generally maintained their assessments at the tropical storm strength. According to the NMC, SAUDEL made landfall near Zhangpu, Fujian at about 6:30 am. This marked its third landfall in China, after the two made in Zhejiang province in late August.
As the continental ridge established in central China, SAUDEL turned west-northwest and entered Guangdong several hours after making landfall. It weakened into a tropical depression and turned west in the afternoon of September 3. In the absence of moisture supply from a southwesterly airstream, SAUDEL's convections dissipated quickly. The NMC stopped tracking it at 5 pm that day, while the HKO downgraded SAUDEL into an area of low pressure at midnight September 4, at which point SAUDEL was still moving west and edging closer to the Pearl River Estuary region.
沙德爾於 8 月 18 日在楚克島附近生成為熱帶低氣壓。受副熱帶高壓脊帶動，沙德爾初時向西北偏北移動，並逐漸增強。它於 22 日快速增強，香港天文台指出它於 23 日達到超強颱風強度。與此同時，沙德爾開始向西北移動，稍後進一步轉向西北偏西。它於 25 日靠近琉球群島，期間有所減弱。26 日，風暴橫過大陸高壓脊及太平洋高壓脊之間的弱點以南海域，其後轉向西至西南偏西，趨向中國東南部沿岸。
沙德爾於 8 月 28 日登陸浙江南部，其後兩天橫過福建、江西及湖南內陸。它逐漸減弱為低壓區，並於 30 日轉向偏南，移至廣西東部。31 日凌晨，沙德爾的殘餘於廣東湛江一帶進入南海北部。
當時熱帶擾動 97W 位於台灣海峽一帶，沙德爾與該擾動於南海北部形成一個廣闊低壓區域。隨著沙德爾的對流增加，日本氣象廳於 8 月 31 日上午 8 時發出烈風警告。沙德爾繼續南移至海南東部，中國中央氣象台及香港天文台於下午 5 時將其升格為熱帶低氣壓。由於沙德爾處於赤道高壓脊北部，當時預料它將向東北偏東移動，稍後沿廣闊低壓區的周邊作逆時針轉動。
受中等垂直風切變影響，沙德爾再度增強為熱帶低氣壓時，其對流向西切離。它於 8 月 31 日晚有所增強，日本氣象廳於 9 月 1 日上午 2 時將其升格為熱帶風暴。由於認為此氣旋與早前於華東登陸的風暴屬同一系統，因此該廳沿用沙德爾一名。沙德爾當日快速向東北偏東移動，對流於其中心附近發展，而其低層環流中心清晰可見。
沙德爾於 9 月 2 日稍後逐漸減速，晚間強對流於風暴中心以北形成，中央氣象台於下午 10 時將沙德爾的估計強度由每秒 18 米（每小時 65 公里）上調至每秒 23 米（每小時 83 公里）。風暴於 3 日凌晨轉向西北移動，並可見一紮實中心正在發展。上午 5 時，中央氣象台將沙德爾升格為強烈熱帶風暴，而其他機構普遍維持熱帶風暴的評級。繼 8 月底風暴於浙江省兩度登陸，中央氣象台表示沙德爾於上午 6 時 30 分左右於福建漳浦一帶第三度登陸。
隨著大陸高壓脊於華中建立，沙德爾登陸後轉向西北偏西移動，數小時後進入廣東省。它於 9 月 3 日下午減弱為熱帶低氣壓，並轉向西移。由於缺乏西南氣流所帶來的濕氣供應，沙德爾的對流快速消散。中央氣象台於當天下午 5 時停止追蹤該系統，而香港天文台則於 4 日午夜將沙德爾降格為低壓區，當時沙德爾仍正在西移並接近珠江口一帶。
| Weather in Hong Kong During Approach 風暴影響時香港天氣狀況 |
Link to relevant HKO weather report bulletins:
31/8 ●
1/9 ●
2/9 ●
3/9 ●
4/9
香港天文台相關天氣報告連結：
31/8 ●
1/9 ●
2/9 ●
3/9 ●
4/9
In the morning of August 31, the HK Observatory issued a special weather tip, stating that SAUDEL's remnants would move to near the southeastern Hainan coast and intensify into a tropical depression. The local weather turned unstable in the afternoon with occasional heavy showers; the Amber Rainstorm Warning was in force between 12:25 pm and 2:05 pm. At 4 pm, the Observatory indicated that the #1 Standby Signal would be issued at 6:10 pm.
SAUDEL's centre was in eastern Hainan, at a distance of about 520 km southwest of Hong Kong, when the #1 Signal was issued. The Observatory said that the #1 Signal would remain in force at least until noon of September 1, while local winds were expected to strengthen gradually. The weather was unstable on September 1; winds at several offshore and elevated stations such as Green Island, Ngong Ping, Sha Chau, Tate's Cairn briefly reached strong force as rainbands reached the territory, and gale force winds were recorded at Waglan Island before noon.
In the tropical cyclone warning bulletin at 4 pm September 1, the Observatory suggested that the chance of necessitating the #3 Strong Wind Signal that day or on September 2 was low as strong winds were unlikely to reach the territory. However, tropical cyclone signals might remain in force until later that week. SAUDEL passed at a distance of around 240 km to the south-southeast to southeast that evening and night, and continued to move northeast on September 2. As SAUDEL moved away, the weather in Hong Kong improved that day. North to northwesterly winds were still affecting the territory, and strong winds were occasionally observed in offshore waters and on high ground. Since SAUDEL was expected to turn west later that week, the Observatory said that there was substantial uncertainty in SAUDEL's intensity, and that it would assess the need to issue the #3 Signal as SAUDEL approached the Pearl River Estuary.
SAUDEL made landfall early on September 3 and moved inland. It moved to a higher latitude than was previously forecast, and it became apparent that SAUDEL would not be a significant threat even if it managed to come close to the Pearl River Estuary. As SAUDEL weakened into a tropical depression, the Observatory announced in its 3 pm tropical cyclone warning bulletin that the chance of issuing the #3 Signal was rather low. The local weather was generally stable with sunny intervals on September 3.
As the Observatory downgraded SAUDEL into an area of low pressure shortly after midnight September 4, the #1 Standby Signal was cancelled at 12:10 am. SAUDEL was situated about 260 km north-northeast of Hong Kong at that time, slightly more distant than its closest point of approach on September 1.
8 月 31 日早上，香港天文台發出特別天氣提示，表示沙德爾的殘餘將移至海南島東南沿岸一帶並增強為熱帶低氣壓。當日下午本港天氣轉趨不穩定，間中有大雨，黃色暴雨警告一度於下午 12 時 25 分至 2 時 05 分生效。下午 4 時，天文台表示一號戒備信號將於下午 6 時 10 分發出。
一號信號發出時，沙德爾的中心位於海南東部、本港西南約 520 公里處。天文台指出一號信號將至少維持至 9 月 1 日正午，本地風力會逐漸上升。1 日天氣仍然不穩定，而雨帶靠近時部分離岸及高地站如青洲、昂坪、沙洲及大老山錄得強風，正午前橫瀾島更曾吹烈風。
天文台於 9 月 1 日下午 4 時的熱帶氣旋警報中提及本港普遍吹強風的機會不大，當日及翌日需要改發三號強風信號的機會較低，但熱帶氣旋警告信號可能需要維持至當週後期。沙德爾於黃昏至晚間在香港東南偏南至東南方約 240 公里掠過，並於 2 日繼續向東北移動。隨著沙德爾遠離，本港天氣改善。2 日本港仍普遍吹北至西北風，而離岸及高地間中吹強風。由於預料沙德爾將於當週後期轉向偏西，天文台指出其強度變數甚大，會評估風暴接近珠江口時是否需要改發三號信號。
沙德爾於 9 月 3 日早段登陸並移入內陸。它的緯度較原先預計高，即使移近珠江口亦明顯不會構成威脅。隨著沙德爾減弱為熱帶低氣壓，天文台於下午 3 時的發佈表示改發三號信號機會頗低，而當日天氣大致穩定，短暫時間有陽光。
天文台於 9 月 4 日午夜後不久將沙德爾降格為低壓區，一號戒備信號於上午 12 時 10 分取消。當時沙德爾位於香港東北偏北約 260 公里，較 1 日最接近香港時稍遠。
| Image Gallery 圖片庫 |
Figure 1 - AI model forecasts (top-left: Google WNC; top-right: AIFS) and traditional numerical model forecast (bottom-left: GFS; bottom-right: ECMWF) on August 24
圖 1 - 8 月 24 日人工智能模式（左上：Google WNC；右上：AIFS）及傳統數值模式（左下：GFS；右下：ECMWF）預測
Figure 2 - Surface weather chart at 8 am August 24 showing the existence of four tropical cyclones in the northwest Pacific and South China Sea
圖 2 - 8 月 24 日上午 8 時之地面天氣圖顯示西北太平洋及南海共有四個熱帶氣旋
Figure 3 - Satellite image at 8 am August 24
圖 3 - 8 月 24 日上午 8 時之衛星雲圖
Figure 4 - Radar image of SAUDEL as it traversed the Ryukyu Islands early on August 26
圖 4 - 8 月 26 日早段沙德爾橫過琉球群島時之雷達圖
Figure 5 - Forecast tracks from various official agencies on August 26
圖 5 - 8 月 26 日之官方機構預測路徑圖
Figure 6 - 500 hPa upper-level weather map at 8 am August 28
圖 6 - 8 月 28 日上午 8 時之 500 百帕高空天氣圖
Figure 7 - Steering flow chart at 8 am August 28
圖 7 - 8 月 28 日上午 8 時之駛流場分佈圖
Figure 8 - Google WNC model forecast on August 29 showing a possible anticlockwise track in southern China and northern South China Sea
圖 8 - 8 月 29 日 Google WNC 模式預測顯示系統有機會於華南及南海北部呈現逆時針方向的路徑
Figure 9 - Radar image of SAUDEL's remnants near the Guangdong-Guangxi border (left) and the system redeveloping east of Hainan Island (right)
圖 9 - 雷達圖顯示沙德爾的殘餘位於廣東及廣西交界（左）及於海南島以東重新發展（右）
Figure 10 - Satellite image of SAUDEL developing south of Hong Kong. Its low-level circulation centre was clearly visible.
圖 10 - 衛星雲圖顯示沙德爾於香港以南發展，其低層環流中心清晰可見
Figure 11 - Wind field analysis map at 9:59 pm September 1
圖 11 - 9 月 1 日下午 9 時 59 分之風場分析圖
Figure 12 - Radar image of SAUDEL as it passed to the southeast of Hong Kong
圖 12 - 沙德爾於香港東南方掠過時之雷達圖
Figure 13 - Forecast tracks from various official agencies on September 2
圖 13 - 9 月 2 日之官方機構預測路徑圖
Figure 14 - Satellite image of SAUDEL as it made landfall in southern Fujian on September 3
圖 14 - 9 月 3 日沙德爾登陸福建南部時之衛星雲圖
Figure 15 - Rainfall distribution map for August 31 (left) and September 1 (right)
圖 15 - 8 月 31 日（左）及 9 月 1 日（右）之雨量分佈圖
| 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。
| Station 風速站 |
Max. 10-min avg. wind speed 最高十分鐘平均風速 |
Beaufort classification 蒲福氏風級分類 |
| Chek Lap Kok 赤鱲角 | 45 km/h | STRONG 強風 |
| Cheung Chau 長洲 | 37 km/h | Fresh 清勁 |
| Kai Tak 啟德 | Below "fresh" threshold of 31 km/h 低於「清勁」下限的 31 km/h | |
| Lau Fau Shan 流浮山 | 40 km/h | Fresh 清勁 |
| Sai Kung 西貢 | Below "fresh" threshold of 31 km/h 低於「清勁」下限的 31 km/h | |
| Sha Tin 沙田 | ||
| Ta Kwu Ling 打鼓嶺 | ||
| Tsing Yi (SHL) 青衣蜆殼油庫 | ||
| Number of stations recording at least STRONG force (force 6 - 7) winds: 錄得 強風 (6 - 7 級) 或更高風速的站數: |
1 |
| Number of stations recording at least GALE force (force 8 - 9) winds: 錄得 烈風 (8 - 9 級) 或更高風速的站數: |
0 |
| Number of stations recording at least STORM force (force 10 - 11) winds: 錄得 暴風 (10 - 11 級) 或更高風速的站數: |
0 |
| Number of stations recording HURRICANE force (force 12) winds: 錄得 颶風 (12 級) 風速的站數: |
0 |
| 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
YYMMDDZZ Lat Long Wind |
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 SAUDEL 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 Oct 10 2026 00:30:39 HKT
Last Modified 最近修訂日期: Sun Sep 20 2026
