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TC Watch / 熱帶氣旋 > Selected TC Review / 重要熱帶氣旋回顧 > 202519W (KAJIKI 劍魚) [Refresh 更新]

202519W (KAJIKI 劍魚) - Profile 檔案

(First draft issued on August 31, 2025, final version issued on April 18, 2026)
(初稿於 2025 年 8 月 31 日發出，最後版本於 2026 年 4 月 18 日上載)

Brief profile of KAJIKI | 劍魚小檔案:

^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。

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
	2025/08/22 (FRI) 21:40 HKT	SE 790 km	W at 28 km/h	45 km/h (25 knots, TD)
	2025/08/24 (SUN) 12:10 HKT**	SSW 660 km	W at 18 km/h	140 km/h (75 knots, T)

*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 12:11 HKT.
**強烈季候風信號於下午 12 時 11 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）

The precursor to KAJIKI, tropical disturbance 90W, formed in the northwest Pacific in mid-August. Although the disturbance was believed to develop gradually while it crossed the seas east of the Philippines, the convective clouds remained disorganized in the next couple of days. Numerical models initially predicted 90W to move west-northwest for a few days, but then diverged to two scenarios, with one continuing with the west-northwest track and leading the system towards Taiwan, and the other indicating a change to a westerly course, guiding the storm towards northern South China Sea.

As 90W moved close to the Philippines, models came to the consensus that it would move turn west and move towards the seas near Hainan Island. 90W's circulation had also become more organized; the JTWC issued a tropical cyclone formation alert at 2 am August 22, while the JMA issued a gale warning at 8 am the same day. The NMC upgraded 90W into a tropical depression at the same time. 90W made landfall in Luzon a few hours later and crossed northern Philippines that afternoon. It entered the South China Sea near dusk and turned westwards. The JTWC upgraded 90W into tropical depression 19W at 8 pm.

Steered by the subtropical ridge to its north, 19W moved westwards quickly. It was initially affected by moderate easterly vertical wind shear; this caused its convections to be displaced to the west. Nevertheless, 19W was in very warm seas with a good supply of moisture from the south. In this favourable environment, 19W intensified gradually into a tropical storm early on August 23 and was given the name KAJIKI by the JMA.

KAJIKI's circulation expanded on August 23. As shear decreased during the day, KAJIKI was then able to maintain its deep convections near the storm centre. KAJIKI developed a central dense overcast later that night, and dipped southwards slightly early on August 24. The NMC upgraded KAJIKI into a typhoon at 2 am, the first official agency to do so. Other agencies generally upgraded the storm to typhoon status in the morning of August 24, as a banding eye developed at KAJIKI's centre.

KAJIKI's eye became clear on satellite images in the afternoon of August 24. The storm turned west-northwest and both the NMC and HKO upgraded it into a severe typhoon at 2 pm. That evening, KAJIKI skirted the seas just off Sanya, Hainan, where record-breaking winds were observed. KAJIKI continued to move west-northwest on August 25 across the Gulf of Tonkin, and made landfall in Hà Tĩnh province, Vietnam near 7 pm as a typhoon. The storm weakened rapidly while on land. It entered Laos early on August 26 as a severe tropical storm, and degenerated into an area of low pressure that night in western Laos.

劍魚的前身是熱帶擾動 90W，它於 8 月中在西北太平洋上生成。雖然預料該擾動將於橫過菲律賓以東海域時逐漸發展，但隨後數天該擾動的對流雲帶仍然欠缺組織。數值模式原先預料 90W 將向西北偏西移動數天，但此後的路徑出現分歧，部分模式預料它繼續向西北偏西移動並靠近台灣一帶，其他模式則預料風暴會西轉，令風暴趨向南海北部。

隨著 90W 移近菲律賓，模式間的分歧收窄，大致同意它將西轉並趨向海南島附近海域。90W 的對流亦開始組織起來，聯合颱風警報中心於 8 月 22 日上午 2 時發出熱帶氣旋形成警報；日本氣象廳於同日上午 8 時發出烈風警告，中國中央氣象台亦於相同時間將 90W 升格為熱帶低氣壓。數小時後，90W 於呂宋登陸，並於下午橫過菲律賓北部，繼而於黃昏時份進入南海並西轉。聯合颱風警報中心於下午 8 時將 90W 升格為熱帶低氣壓 19W。

受北面的副熱帶高壓脊帶動，19W 快速向西移動。初時 19W 受中等偏東垂直風切變影響，令其對流向西切離。雖然如此，但 19W 所處海域非常溫暖，南方水氣供應良好，因此能在整體有利的大氣環境下於 8 月 23 日初段逐漸增強為熱帶風暴，被日本氣象廳命名為劍魚。

劍魚的對流於 8 月 23 日擴展。隨著風切減弱，劍魚能將其深層對流保留於風暴中心附近。它當晚發展出中心密集雲區，並於 24 日早段略為南移。中央氣象台於上午 2 時將劍魚升格為颱風，是首個作出升格的機構。其他官方機構普遍於當日早上升格劍魚為颱風，當時劍魚中心發展出一雲捲風眼。

8 月 24 日下午，劍魚的風眼於衛星雲圖上變得清晰。風暴轉向西北偏西移動，中央氣象台及香港天文台均於下午 2 時將它升格為強颱風。劍魚於黃昏時份掠過海南三亞近海，當地曾錄得破紀錄風速。劍魚於 25 日繼續向西北偏西移動，橫過北部灣，並於下午 7 時左右以颱風強度在越南河靜省登陸。風暴於陸上快速減弱，於 26 日早段以強烈熱帶風暴強度進入老撾，並於當晚在老撾西部減弱為低壓區。

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

Link to relevant HKO weather report bulletins: 22/8 ● 23/8 ● 24/8
香港天文台相關天氣報告連結： 22/8 ● 23/8 ● 24/8

It was very hot with plenty of sunshine on August 22, just before KAJIKI entered the South China Sea. At noon, the HK Observatory indicated that the low pressure area at Luzon would intensify into a tropical cyclone, and the #1 Standby Signal would be issued as the system came to within 800 km of the territory. The Observatory upgraded it into a tropical depression at 8 pm, and issued the #1 Signal at 9:40 pm when the system was about 790 km southeast of Hong Kong.

By the time KAJIKI entered the South China Sea, it was already very clear that it would move westwards and remain at a distance in excess of 500 km from Hong Kong. In the morning of August 23, KAJIKI moved to about 600 km south-southeast of the territory. Local winds generally strengthened at this time, coming in from the east. Strong force winds were observed at some offshore and elevated locations in the afternoon, while winds occasionally reached gale force at Ngong Ping later that afternoon and at night.

Rainbands in KAJIKI's northern semicircle were relatively sparse. The weather turned cloudy in the night of August 23, and a few squally showers affected parts of the territory. Around 10 to 20 mm of rain was observed in southern Hong Kong that day. KAJIKI was closest to Hong Kong near 8 pm, when it passed at a distance of 530 km to the south.

It was mainly cloudy with sunny intervals on August 24, and there were a few isolated showers. Winds did not strengthen further; the Observatory cancelled the #1 Standby Signal at 12:10 pm, when KAJIKI was about 660 km south-southwest of Hong Kong. As strong to gale force winds were still affecting parts of the territory, the Strong Monsoon Signal was issued at 12:11 pm. This signal lasted until 7:45 pm and local winds moderated somewhat that night.

8 月 22 日劍魚進入南海前，本港天氣酷熱，陽光充沛。香港天文台於當日正午表示位於呂宋的低壓區將會增強為熱帶低氣壓，會於系統進入本港 800 公里範圍時發出一號戒備信號。天文台於下午 8 時作出升格，並於下午 9 時 40 分發出一號信號，當時該系統位於香港東南約 790 公里。

劍魚進入南海時，預報明顯指出風暴將西移，並與本港保持 500 公里以上的距離。8 月 23 日早上，劍魚移至香港東南偏南約 600 公里，本地東風普遍於此時增強。下午部分離岸及高地站吹強風，稍後及晚間昂坪間中吹烈風。

劍魚北半圓的雨帶相對較稀疏。8 月 23 日晚間本港漸轉多雲，部分地區有幾陣狂風驟雨，香港南部錄得約 10 至 20 毫米雨量。劍魚於下午 8 時左右最接近本港，於南面約 530 公里掠過。

8 月 24 日本港大致多雲，日間短暫時間有陽光，局部地區亦有幾陣驟雨。風勢並未有進一步增強，天文台於下午 12 時 10 分取消一號戒備信號，當時劍魚位於香港西南偏南約 660 公里。由於本港部分地區仍然吹強風至烈風，天文台隨即於下午 12 時 11 分發出強烈季候風信號，而此信號維持至下午 7 時 45 分，當晚本地風勢稍為放緩。

Image Gallery 圖片庫

Figure 1 - Numerical model ensemble forecasts (left - GFS; right - ECMWF) at 8 am August 18
圖 1 - 8 月 18 日上午 8 時之數值模式集成預報（左：GFS；右：ECMWF）

Figure 2 - Satellite image of KAJIKI over Luzon
圖 2 - 劍魚位於呂宋時之衛星雲圖

Figure 3 - 500-hPa upper level weather chart at 8 am August 23
圖 3 - 8 月 23 日上午 8 時之 500 百帕高空天氣圖

Figure 4 - Forecast tracks from various official agencies at 8 am August 23
圖 4 - 8 月 23 日上午 8 時之官方機構預測路徑圖

Figure 5 - Steering flow chart at 8 am August 24
圖 5 - 8 月 24 日上午 8 時之駛流場分佈圖

Figure 6 - Wind field analysis map at 10:19 am August 24
圖 6 - 8 月 24 日上午 10 時 19 分之風場分析圖

Figure 7 - Satellite image of KAJIKI as it skirted past the seas south of Hainan
圖 7 - 劍魚掠過海南島以南海域時之衛星雲圖

Figure 8 - Satellite image of KAJIKI just prior to its landfall in Vietnam
圖 8 - 劍魚即將登陸越南時之衛星雲圖

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。

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 KAJIKI 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: Thu Jun 11 2026 12:04:44 HKT
Last Modified 最近修訂日期: Sat Apr 18 2026