• A. 天氣資訊
• B. 天文資訊
• C. 熱帶氣旋
• D. 本站活動
• E. 其他資訊
• F. 搜尋本站

主頁 現時生效警告 分區天氣 雨量 紫外線指數 華南海域天氣報告 香港天氣預測 天氣照片 天氣圖 衛星 / 雷達圖像 華南天氣要素圖

香港天文資料 世界時間 世界各大城市太陽資訊 特別天文事件 日食日期和數字 月食日期和數字 日月食問與答 日食計算機

最新熱帶氣旋資訊 天文台之熱帶氣旋資訊 官方熱帶氣旋路徑資料 熱帶氣旋信號機率 各站預測路徑圖 熱帶氣旋資料庫 熱帶氣旋尋找工具 重要熱帶氣旋回顧 影響香港氣旋之風速數據 厄爾尼諾-南方濤動動態 西北太平洋: ASCAT 風場圖 西北太平洋: 風 / 分析 西北太平洋: 駛流圖 參考資料: 熱帶氣旋名稱 參考資料: 蒲福氏風級 參考資料: 熱帶氣旋分類 參考資料: 熱帶氣旋發佈機制 有關熱帶氣旋之連結

實時天氣資訊圖 本站選舉 * 一觸即發遊戲 * 月氣候展望比賽

其他氣象連結 合作網站 關於我們 本站聲明 * 網誌 "望天打卦"

TC Watch / 熱帶氣旋 > Selected TC Review / 重要熱帶氣旋回顧 > 201414W [Refresh 更新]

201414W - Profile 檔案

(Issued on September 28, 2014)
(於 2014 年 9 月 28 日發出)

Brief profile of 14W | 14W 小檔案:

TC signals for Hong Kong & Track 香港曾經生效的熱帶氣旋警告和路徑圖:

Table 表:

Signal 信號	Date and time 日期和時間	Distance from HK 與香港的距離	Predicted movement 預測移動方向和速度	Max. 10-min winds 中心最高十分鐘平均風速
	2014/09/07 (SUN) 09:40 HKT	SSW 390 km	NW at 16 km/h	45 km/h (25 knots, TD)
	2014/09/08 (MON) 09:10 HKT	WSW 390 km	NW at 14 km/h	55 km/h (30 knots, TD)

Figure 圖:

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 from HKO 天文台的熱帶氣旋路徑圖:

Past HKWW Bulletins on 14W 本站有關 14W 的發佈

Please click here for bulletins on HAGIBIS. 請按這裡。

Storm Formation and Development 氣旋形成和發展

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)

14W is the first unnamed tropical cyclone to necessitate tropical cyclone warning signals since 2006. After a long period of inactivity, a blob of convections developed within South China Sea in early September. The JTWC issued a tropical cyclone formation alert at 2 pm September 6 as the system appeared to gather strength. Meanwhile, the HKO upgraded it into a tropical depression at 8 am the next day, when it was around 400 km SSW of Hong Kong. Due to the proximity of the system, the #1 Standby Signal was issued at 9:40 am. The JTWC also upgraded the system and gave it the number 14W.

14W was at that time situated to the SW of a subtropical ridge, and was therefore forecast to move NW. This implied that 14W would maintain a considerable distance from Hong Kong; together with its weak strength, widespread strong winds were not expected to affect the territory, and the Observatory mentioned in various reports that the chance of issuing higher signals was not high.

As the storm moved NW, its rainbands touched southern China. Locally, there were scattered showers but the amount of rainfall was low in general. Winds strengthened slightly on September 7, occasionally reaching strong force at offshore locations and on high ground.

14W 是自 2006 年以來首個未命名風暴令天文台發出熱帶氣旋警告信號。經過長時間的沉寂後，一團對流於 9 月初在南海發展。隨著該雲團有增強跡象，聯合颱風警報中心於 6 日下午 2 時對其發出熱帶氣旋形成警報。香港天文台於翌日早上 8 時將其升格為熱帶低氣壓，當時它為處本港西南偏南約 400 公里。由於該熱帶低氣壓較為接近本港，天文台於上午 9 時 40 分發出一號戒備信號。聯合颱風警報中心亦將系統升格，並給予編號 14W。

14W 當時處於副熱帶高壓脊的西南沿，並預料向西北移動，這意味著它會與本港保持距離；亦由於系統偏弱，當時估計本港普遍將不會吹強風，因此天文台於其熱帶氣旋警告中多次表示發出更高信號的機會不大。

隨著風暴向西北移動，其雨帶掠過華南沿岸，香港當天有幾陣驟雨，但雨勢不大。風勢於 7 日稍為增強，離岸及高地間中吹強風。

Figures 1a and 1b - Satellite images of 14W at formation (left) and at closest approach to Hong Kong (right)
圖 1a 及 1b - 14W 初形成 (左) 及最接近香港 (右) 時的衛星雲圖

Figure 2 - Steering flow chart at 8 am September 7
圖 2 - 9 月 7 日上午 8 時之駛流圖

Figure 3 - HKO's track forecast on September 7
圖 3 - 9 月 7 日香港天文台之路徑預測

Landfall and Dissipation 登陸及消散

14W turned more poleward in the latter part of September 7, and was the closest to Hong Kong at around 2-3 am September 8 when it was at 360 km to the SW. Showers were more frequent on September 8; more than 10 mm of rainfall was recorded at some parts of Hong Kong. Winds started to subside in the morning, and the Standby Signal was cancelled at 9:10 am.

Since 14W was close to landmass, its development was severely hindered. Convections were sheared to the west throughout its journey across northern South China Sea, leaving the low-level circulation centre partly exposed. According to the Chinese authorities, 14W made landfall near Zhanjiang at around 1:10 pm September 8, and was carrying force 7 winds near its centre. It turned WNW and soon dissipated in Guangxi.

It is worth mentioning that September 8 was the mid-autumn festival. In Hong Kong, clouds gradually dissipated in the latter part of September 8 as the influence of 14W diminished. The full moon was visible at times that night. As the subtropical ridge re-established, there were sunny periods in the following day.

14W 於 9 月 7 日後段的移向較為偏北，並於 8 日早上 2 至 3 時最接近香港，當時它處於本港西南約 360 公里。驟雨於 8 日較為頻密，本港部分地區當天錄得超過 10 毫米雨量。由於風勢於早上逐漸緩和，天文台於上午 9 時 10 分取消一號戒備信號。

由於 14W 靠近陸地，其發展受嚴重限制。14W 於南海前進期間，其對流一直被切離至系統西面，令低層環流中心部分外露。中國有關方面表示，14W 於 8 日下午約 1 時 10 分登陸湛江一帶，中心附近風力達 7 級。登陸後風暴向西北偏西移動，不久後於廣西消散。

值得一提的是 9 月 8 日為中秋節。香港方面，隨著 14W 的影響漸退，雲層於 8 日後段轉薄，晚間更可見滿月。副熱帶高壓脊隨即重新建立，翌日本港部分時間有陽光。

Figures 4a and 4b - 14W's outer rainbands affected Hong Kong on September 7 and 8
圖 4a 及 4b - 14W 的外圍雨帶於 9 月 7 及 8 日影響香港

Figure 5 - Total rainfall chart for September 8
圖 5 - 9 月 8 日之總雨量圖

Figure 6 - 14W about to make landfall near Zhanjiang
圖 6 - 14W 即將於湛江一帶登陸

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

(Except for special cases, this section is not available for cyclones that only necessitated the Standby Signal 除非特別情況，否則此部只當氣旋令天文台發出三號或更高信號時提供)

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

Table 3: Rainfall (in millimetres) contributed by 14W 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 (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: Sun Sep 08 2024 12:45:51 HKT
Last Modified 最近修訂日期: Mon Jul 24 2023