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TC Watch / 熱帶氣旋 > Selected TC Review / 重要熱帶氣旋回顧 > 202523W (MITAG 米娜) [Refresh 更新]

202523W (MITAG 米娜) - Profile 檔案

(First draft issued on November 1, 2025)
(初稿於 2025 年 11 月 1 日發出)

Brief profile of MITAG | 米娜小檔案:

^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
	2025/09/17 (WED) 21:20 HKT	SE 770 km	NW at 18 km/h	55 km/h (30 knots, TD)
	2025/09/19 (FRI) 09:20 HKT	E 160 km	NW at 15 km/h	90 km/h (50 knots, STS)
	2025/09/20 (SAT) 09:20 HKT	NNW 130 km	WNW slowly	45 km/h (25 knots, TD)
	2025/09/20 (SAT) 10:40 HKT	NNW 140 km	WNW slowly	45 km/h (25 knots, TD)

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

Percentile Ranks 百分等級:

IR imagery animation 紅外線雲圖動畫:

Radar animation 雷達圖動畫:

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:

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）

The formative cloud bands that would become MITAG gathered in the seas east of the Philippines as tropical disturbance 99W on September 15. Numerical models predictions generally favoured a northwestward track towards Luzon and northeastern South China Sea, but there was some uncertainty on its movement as the system approached southeastern China. It was believed that the ridge in China would cause 99W to turn west or even southwest.

Wind field analyses in the morning of September 16 depicted strong winds near 99W's centre. The JTWC issued a tropical cyclone formation alert at 8 am, and upgraded 99W into tropical depression 23W six hours later. Meanwhile, the JMA issued a gale warning at 2 pm. The NMC and HKO upgraded 23W into a tropical depression in the afternoon and nighttime, respectively.

23W moved west-northwest to northwest and made landfall in eastern Luzon in the small hours of September 17. Prior to its landfall, radar images at the Philippines showed that 23W had a rather complete centre surrounded by intense convections. The JTWC assessed 23W as a 45-knot (83 km/h) tropical storm, while other agencies kept 23W as a tropical depression. 23W travelled across Luzon that day and its structure deteriorated gradually as it traversed the mountains there.

23W entered the South China Sea in the night of September 17. The effect of crossing land became apparent, as the system's centre was almost devoid of deep convections. It moved west-northwest early on September 18, and the warm South China Sea allowed 23W to rebuild during the day. At 2 pm, the JMA upgraded it into a tropical storm and named it MITAG. MITAG's convections gradually expanded in the afternoon, and convective bursts could be seen developing in its eastern semicircle.

MITAG moved northwest to north-northwest in the night of September 18 and early on September 19. Its cloud bands tightened and radar images suggested that the storm had intensified overnight. The HKO and NMC upgraded MITAG into a severe tropical storm at 9 am. The storm jogged westwards early in the morning, but turned north-northwest several hours later. MITAG made landfall near Shanwei, Guangdong at around 2:50 pm. It turned northwest and weakened into a tropical storm shortly after landfall, and further into a tropical depression near midnight September 20.

MITAG turned west-northwest early on September 20 and continued to move inland. It weakened into an area of low pressure that afternoon just north of Guangzhou.

9 月 15 日，米娜雛形的雲帶於菲律賓以東海域集結，並成為熱帶擾動 99W。數值模式大致傾向預測系統向西北移動，趨向呂宋及南海東北部。但是，系統靠近中國東南部時的預測有較大變數，當時相信位於中國的高壓脊將令 99W 轉向偏西甚至西南移動。

9 月 16 日的風場分析顯示 99W 近中心有強風區。聯合颱風警報中心於上午 8 時發出熱帶氣旋形成警報，並於六小時後將 99W 升格為熱帶低氣壓 23W。另一方面，日本氣象廳於下午 2 時發出烈風警告，而中國中央氣象台及香港天文台分別於當日下午及晚間將 23W 升格為熱帶低氣壓。

23W 向西北偏西至西北移動，並於 9 月 17 日凌晨登陸呂宋東部。登陸前菲律賓的雷達圖顯示 23W 的中心頗為完整，並被猛烈對流包圍。聯合颱風警報中心估計其風力達 45 節（每小時 83 公里；熱帶風暴級），而其餘機構則維持熱帶低氣壓的評級。23W 當日橫過呂宋，經過高山時其結構逐漸轉差。

23W 於 9 月 17 日晚進入南海。系統橫過呂宋的影響漸趨明顯，其中心幾乎沒有深層對流。它於 18 日早段向西北偏西移動，溫暖的南海令 23W 於當天重新發展。下午 2 時，日本氣象廳將其升格為熱帶風暴，命名為米娜。米娜的對流於下午逐漸擴展，其東半圓有對流爆發。

米娜於 9 月 18 日晚上至 19 日早段向西北至西北偏北移動。風暴的雲帶收緊，雷達圖顯示風暴凌晨有所增強。香港天文台及中央氣象台於上午 9 時將米娜升格為強烈熱帶風暴。它早上初段路徑稍為西偏，但數小時後轉回西北偏北。米娜於下午 2 時 50 分左右登陸廣東汕尾一帶，登陸後不久轉向西北並減弱為熱帶風暴，其後於 20 日午夜左右進一步減弱為熱帶低氣壓。

米娜於 9 月 20 日早段轉向西北偏西，繼續移入內陸。它當日下午於廣州以北不遠處減弱為低壓區。

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

Link to relevant HKO weather report bulletins: 17/9 ● 18/9 ● 19/9 ● 20/9
香港天文台相關天氣報告連結： 17/9 ● 18/9 ● 19/9 ● 20/9

The HK Observatory published a blog post on September 12 regarding three potential low pressure systems in the northwest Pacific Ocean. MITAG was the second of these systems; the Observatory upgraded it into a tropical depression at 8 pm September 16, and released its initial forecast track at 9:30 pm. In a rather rare move, the Tropical Cyclone Warning For Shipping (which contained the track and intensity forecast) was revised twice before the next regular update: once at 10 pm to revise the intensity forecast four days later (8 pm September 20) from 75 km/h to 55 km/h, and another at 10:52 pm to revise some forecast positions.

Apart from localized heavy showers in the morning, it was mainly cloudy and very hot on September 17. As MITAG entered the South China Sea, the #1 Standby Signal was issued at 9:20 pm when the storm was situated about 770 km southeast of Hong Kong. Showers associated with MITAG's outer rainbands affected southeastern China in the afternoon of September 18; there were thundery showers over parts of the territory associated with an increase in wind speeds. At 9:15 pm, the Observatory announced that the #3 Strong Wind Signal would be issued between 9 am and 11 am on September 19, as MITAG was expected to intensify and approach the eastern Guangdong coast.

Locally, winds reached strong force in offshore and elevated stations in the small hours of September 19, and gales were occasionally observed at Ngong Ping. The #3 Strong Wind Signal was eventually issued at 9:20 am when MITAG was about 160 km east of Hong Kong. As MITAG approached coastal Guangdong, the wind direction in Hong Kong backed to the northwest. However, winds were rather weak and many stations not exposed to the northwest actually saw a decrease in wind speeds.

MITAG's southwestern rainbands reached Hong Kong in the afternoon of September 19. The rain was relatively light; except in northeastern Hong Kong, most parts of the territory received less than 10 mm of rain that day. Winds strengthened at some locations as the rainbands approached, but again the increase was short-lived. The wind direction backed to the west gradually during the night. A stronger rainband approached the territory from west to east in the small hours of September 20, and the Amber Rainstorm Warning was issued at 4:05 am. Rain persisted into the morning and was rather heavy occasionally; there were also some squally thunderstorms.

MITAG was closest to Hong Kong at 5 am September 20 when it was located about 100 km to the north. As MITAG continued to weaken inland, the #3 Strong Wind Signal was replaced by the #1 Standby Signal at 9:20 am, and the latter was cancelled at 10:40 am. Although the rain moderated somewhat later in the afternoon and that the Amber Rainstorm Warning was cancelled at 3:10 pm, the weather remained unstable in the rest of the day. A total daily rainfall of 98.4 mm was recorded at the Observatory, while that at the Hong Kong International Airport exceeded 200 mm.

The convergence of MITAG's remnant circulation and a southeasterly airstream produced rain that affected Hong Kong during much of September 21. The Amber Rainstorm Warning was again in force between 9:10 am and 5:30 pm that day. It was the rainiest in northeastern New Territories and parts of Lantau Island, where more than 140 mm of rain was recorded. The daily rainfall reported at the Observatory was 81.6 mm. Due to the persistent rainfall, Races 9 and 10 of the race meeting at the Sha Tin Racecourse that afternoon were cancelled as the track condition deteriorated to the point where it was deemed unsafe for the horses and horsemen.

As the subtropical ridge and tropical cyclone RAGASA's subsidence began to affect southern China, the rainbands dissipated gradually towards the end of September 21, and it was mainly sunny on September 22.

香港天文台於 9 月 12 日發表網誌指西北太平洋有三個潛在的低壓系統出現，而米娜是其中的第二個。天文台於 16 日下午 8 時將其升格為熱帶低氣壓，並於下午 9 時 30 分發出首次路徑預測。其後，天文台罕有地於下一次恆常更新時間前兩度修改包含路徑及強度預測的「為船舶提供的熱帶氣旋警告」：首先於下午 10 時將四天後、20 日下午 8 時的強度預測由每小時 75 公里下調至 55 公里，繼而於下午 10 時 52 分修訂部分預測位置。

除早上局部地區有大驟雨外，9 月 17 日大致多雲，天氣酷熱。隨著米娜進入南海，一號戒備信號於下午 9 時 20 分發出，當時米娜位於香港東南約 770 公里。於米娜外圍雨帶相關的驟雨於 18 日下午影響中國東南部，本港部分地區有雷陣雨，風勢增強。由於預料米娜會增強並靠近廣東東部沿岸，天文台於下午 9 時 15 分宣佈會於 19 日上午 9 至 11 時之間改發三號強風信號。

香港離岸及高地風力於 9 月 19 日凌晨達到強風程度，而昂坪間中吹烈風。三號強風信號最終於上午 9 時 20 分發出，米娜當時集結於香港以東約 160 公里。隨著米娜靠近廣東沿岸，香港風向逆轉至西北，多區風勢較弱，西北面並不當風的站點風速更有所下降。

米娜西南方的雨帶於 9 月 19 下午到達本港，但雨勢相對較弱。除本港東北部外，多區當日雨量少於 10 毫米。雨帶靠近時部分地區風勢增強，但並不持續，而當晚風向逆轉至偏西。20 日凌晨，一道較強的雨帶由西至東靠近本港，天文台於上午 4 時 05 分發出黃色暴雨警告。降雨持續至早上，間中雨勢頗大，亦有幾陣狂風雷暴。

米娜於 9 月 20 日上午 5 時最接近香港，於北面約 100 公里處掠過。隨著米娜繼續於內陸減弱，三號強風信號於上午 9 時 20 分被一號戒備信號取代，而後者亦於上午 10 時 40 分取消。雖然雨勢於下午略為減弱且黃色暴雨警告於下午 3 時 10 分取消，但當日餘下時間天氣仍然不穩定。天文台當日雨量為 98.4 毫米，而香港國際機場雨量更達 200 毫米。

米娜的殘餘對流與一道東南氣流匯聚，令香港於 9 月 21 日大部份時間有雨。黃色暴雨警告於上午 9 時 10 分至下午 5 時 30 分之間再度生效。新界北部及大嶼山部分地區雨勢最大，錄得超過 140 毫米雨量，而天文台當日雨量為 81.6 毫米。由於天雨持續，沙田馬場跑道狀態轉差，對馬匹及騎師或構成危險，香港賽馬會遂宣佈取消當日下午的第 9 及第 10 場賽事。

隨著副熱帶高壓脊及熱帶氣旋樺加沙的外圍下沉氣流開始影響華南，雨帶於 9 月 21 日末段逐漸消散，22 日本港大致天晴。

Image Gallery 圖片庫

Figure 1 - JTWC's initial forecast track showing the prediction of a direct hit at Hong Kong
圖 1 - 聯合颱風警報中心的初始預測路徑圖，顯示氣旋有機會直趨香港

Figure 2 - HKO forecast tracks and intensities issued for 8 pm September 16. The forecast was changed twice before its next regular update.
圖 2 - 香港天文台於 9 月 16 日下午 8 時發佈的預測路徑及強度圖，其預測於下次恆常更新前曾兩度被修改

Figure 3 - Satellite (top) and radar images (bottom) of MITAG in its initial stage of formation
圖 3 - 米娜形成初期之衛星雲圖（上）及雷達圖（下）

Figure 4 - ECMWF, Google DeepMind FNV3 and GFS ensemble predictions (from top to bottom) on September 17
圖 4 - 9 月 17 日之 ECMWF、Google DeepMind FNV3 及 GFS 集成模式預測（由上至下）

Figure 5 - Steering flow chart at 8 am September 17
圖 5 - 9 月 17 日上午 8 時之駛流場分佈圖

Figure 6 - 500 hPa weather map at 8 am September 17
圖 6 - 9 月 17 日上午 8 時之 500 百帕天氣圖

Figure 7 - Forecast tracks from various official agencies at 2 pm September 18
圖 7 - 9 月 18 日下午 2 時之官方機構預測路徑圖

Figure 8 - Satellite image of MITAG at peak intensity
圖 8 - 米娜達到巔峰強度時之衛星雲圖

Figure 9 - Wind field analysis map at 10:30 am September 19
圖 9 - 9 月 19 日上午 10 時 30 分之風場分析圖

Figure 10 - Radar images at 6-hour intervals from 8 am September 19 to 2 pm September 20
圖 10 - 9 月 19 日上午 8 時至 20 日下午 2 時每六小時之雷達圖

Figure 11 - Local weather element distribution maps at 6-hour intervals from 8 am September 19 to 2 pm September 20 (strong winds or above are represented by red wind barbs)
圖 11 - 9 月 19 日上午 8 時至 20 日下午 2 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 12 - Wind speed time series at Cheung Chau, Green Island, Lau Fau Shan and Tate's Cairn (top to bottom) between September 19 and 20
圖 12 - 長洲、青洲、流浮山及大老山（上至下）於 9 月 19 至 20 日之風速時間序列圖

Figure 13 - Rainfall distribution maps for September 20 (left) and 21 (right)
圖 13 - 9 月 20 日（左）及 21 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。

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 MITAG 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 11:53:58 HKT
Last Modified 最近修訂日期: Sat Nov 01 2025