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TC Watch / 熱帶氣旋 > Selected TC Review / 重要熱帶氣旋回顧 > 201611W (DIANMU 電母) [Refresh 更新]

201611W (DIANMU 電母) - Profile 檔案

(Issued on October 11, 2016)
(於 2016 年 10 月 11 日發出)

Brief profile of DIANMU | 電母小檔案:

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
	2016/08/17 (WED) 11:30 HKT	SW 200 km	W Slowly	45 km/h (25 knots, TD)
	2016/08/17 (WED) 22:15 HKT	SW 240 km	W Slowly	55 km/h (30 knots, TD)
	2016/08/18 (THU) 11:15 HKT	WSW 310 km	W at 15 km/h	65 km/h (35 knots, TS)
	2016/08/18 (THU) 13:15 HKT	WSW 350 km	W at 18 km/h	65 km/h (35 knots, TS)

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 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)

A broad area of monsoon depression persisted in northern South China Sea in mid-August. It transformed into a tropical depression in the morning of August 17, at around 200 km southwest of Hong Kong. At that time, a high pressure cell was established in central China, and was strengthening gradually. Under its influence, the tropical depression was expected to move west slowly in the general direction of Leizhou Peninsula.

The JTWC issued a tropical cyclone formation alert for the system that night, while the JMA issued a gale warning. Both agencies upgraded the system at 8 am August 18; giving it the storm number 11W and the name DIANMU respectively. DIANMU's more intense convections are concentrated in the south to southwestern peripheries. It moved west-southwest and crossed Leizhou Peninsula that afternoon, picking up speed in the process as the high pressure in China intensifies.

DIANMU entered the Gulf of Tonkin that night and the larger body of warm water there allowed the storm to intensify. Its convections tightened and the Chinese authorities upgraded it into a severe tropical storm on August 19, while the other official agencies maintained their tropical storm assessment. DIANMU made landfall in northern Vietnam in the afternoon of August 19 and weakened gradually, degenerating into an area of low pressure on August 20.

一個廣闊季風低壓於 8 月中旬在南海北部徘徊。8 月 17 日，該低壓於香港西南方約 200 公里處轉為熱帶低氣壓。當時，中國中部有一高壓區，並逐漸增強。受其影響，該熱帶低氣壓預料會向偏西緩慢移動，靠近雷州半島。

聯合颱風警報中心當晚對該系統發出熱帶氣旋形成警報，而日本氣象廳則發出烈風警告。兩台均於 18 日上午 8 時作出升格，分別給予風暴編號 11W 及命名為電母。電母較強的對流集中在其南及西南面；它向西南偏西移動，於下午橫過雷州半島，並因於中國的高壓增強而加速移動。

電母於 18 日晚進入北部灣。由於該區有大片較暖海域，風暴逐漸增強。它的對流變得較為緊密，中國方面將其升格為強烈熱帶風暴，但其他官方氣象台則維持熱帶風暴的評級。電母於 19 日下午登陸越南北部，隨後逐漸減弱，於 20 日減弱為低壓區。

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

Link to relevant HKO weather report bulletins: 17/8 18/8
香港天文台相關天氣報告連結：17/8 18/8

The weather in Hong Kong has been unstable prior to DIANMU's formation as the monsoon depression had already been lingering around northern South China Sea for several days. The HKO issued the #1 Standby Signal at 11:30 am on August 17, the same time as the upgrade into a tropical depression. Winds were generally moderate in the territory at that time, coming in from the east. The HKO expected local winds to strengthen overnight and issued the #3 Strong Wind Signal at 10:15 pm the same day. As the storm moved west, local winds veered to the southeast early on August 18, together with an increase in wind speed. The strongest winds were generally observed in the early morning, with strong winds recorded at some stations.

DIANMU's track speed increased on August 18 and the storm was moving away from the territory. The HKO issued the #1 Standby Signal at 11:15 am when the storm was around 310 km from Hong Kong. This signal was cancelled just two hours later, at 1:15 pm. It should be mentioned that many places saw another surge in wind speed near 3 pm as a rainband swept across the territory, although they did not reach strong force except for a few stations.

The weather in Hong Kong remained unstable in the following few days and improved on August 22.

由於電母前身的季風低壓盤據南海北部達數天之久，香港的天氣於電母形成之前已經較為不穩定。香港天文台於 8 月 17 日上午 11 時 30 分將該系統升格為熱帶低氣壓之時發出一號戒備信號，當時本港吹東風，風勢和緩。由於天文台預計當晚深夜風勢會有所加強，它於同日晚上 11 時 15 分改發三號強風信號。隨著風暴西移，本港風向於 18 日早段順轉至東南，風速開始上升；早上風勢最為強勁，部分地區吹強風。

電母於 18 日加速西移，與香港的距離逐漸增加。天文台於上午 11 時 15 分改發一號戒備信號，當時電母距離香港約 310 公里。一號信號只維持了兩小時，於下午 1 時 15 分取消。值得留意的是一道雨帶於 3 時左右橫過香港，多數地區風勢曾再度增強，但只有少數氣象站再度錄得強風。

電母遠去後，本港天氣仍然不穩定，至 22 日才見好轉。

Image Gallery 圖片庫

Figure 1 - The monsoon depression lingering around northern South China Sea on August 15 (left) and its tropical cyclone transition on August 17 (right)
圖 1 - 8 月 15 日於南海北部徘徊的季風低壓 (左) 及其於 8 月 17 日之熱帶氣旋轉化 (右)

Figure 2 - Calculated wind field distribution chart at 8 am August 17
圖 2 - 8 月 17 日上午 8 時之估算風場分布圖

Figure 3 - Radar image showing DIANMU at its formation, at around 220 km southwest of Hong Kong
圖 3 - 雷達圖顯示電母初形成時的情況，當時風暴於香港西南約 220 公里處

Figure 4 - Wind field analysis at 9:26 pm August 17
圖 4 - 8 月 17 日下午 9 時 26 分之風場分析圖

Figures 5 - HKO's forecast track and estimated wind radii for DIANMU on August 18
圖 5 - 8 月 18 日香港天文台對電母的預測路徑及風圈估計圖

Figure 6 - Steering flow chart at 8 am August 18
圖 6 - 8 月 18 日上午 8 時之駛流場圖

Figure 7 - Local wind distribution at 7:10 am August 18
圖 7 - 8 月 18 日上午 7 時 10 分之本地風勢分布圖

Figure 8 - Wind speed time series at Cheung Chau (top) and Waglan Island (bottom) on August 17-18
圖 8 - 長洲 (上) 及橫瀾島 (下) 於 8 月 17 至 18 日的風速時間序列圖

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

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 DIANMU 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: Sun Sep 08 2024 12:34:51 HKT
Last Modified 最近修訂日期: Mon Jul 24 2023