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201805W (EWINIAR 艾雲尼) - Profile 檔案

(First draft issued on June 13, 2018; final version issued on July 9, 2018)
(初稿於 2018 年 6 月 13 日發出,最後版本於 2018 年 7 月 9 日上載)

Brief profile of EWINIAR | 艾雲尼小檔案:

JTWC number 聯合颱風警報中心 (JTWC) 號碼 05W
International number 國際編號 1804
Period of existence 生存時期 (JTWC) 2018/06/02 14 HKT - 2018/06/08 20 HKT
Lifetime 壽命 (JTWC) 6.25 days 日
Maximum 1-minute wind (JTWC) JTWC 一分鐘平均最高中心風速 35 knots 節 (Tropical Storm 熱帶風暴)
Minimum pressure (JTWC) JTWC 最低氣壓 994 hPa 百帕
Highest TC signal by HKO
香港天文台發出最高熱帶氣旋警告信號
3 (Strong Wind Signal 強風信號)
Closest point of approach by HKO
香港天文台所示之最接近距離
WNW 200 km (real-time warning 實時報告 and 及 TC report 熱帶氣旋報告)
Time of closest approach by HKO
香港天文台所示之最接近時間
2018/06/08 13 HKT (real-time warning 實時報告 and 及 TC report 熱帶氣旋報告)
Lowest pressure recorded at HKO
香港天文台錄得的最低氣壓
998.7 hPa 百帕 (2018/06/08 17:01 HKT)

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
2018/06/05 (TUE) 11:20 HKT SSW 600 km N at 12 km/h 55 km/h (30 knots, TD)
2018/06/07 (THU) 12:40 HKT WSW 330 km N/NNE at 10 km/h 75 km/h (40 knots, TS)
2018/06/08 (FRI) 15:40 HKT WNW 210 km N/NNE Slowly 55 km/h (30 knots, TD)
2018/06/08 (FRI) 18:20 HKT NW 200 km N/NNE Slowly 55 km/h (30 knots, TD)

Percentile Ranks 百分等級:

Percentile rank among storms with #3 Signal (at compilation of this review)*:
發出三號信號之風暴中的百分等級 (編寫此回顧之時)*:

*This measures the relative wind strength in Hong Kong caused by this storm compared with others that share the same signal. 指標顯示此風暴相對於其他發出同樣信號的風暴為香港帶來之風力強度

For more information, please refer to Wind Speed Data for TCs that Have Affected Hong Kong. 更多資訊載於 影響香港氣旋之風速數據

  Overall:
總計:
12
  Weak
Component Ranks 分部等級
  Reference stations:
參考站:
19
  Weak
  Victoria Harbour:
維多利亞港:
6
  Weak
  Urban:
市區:
14
  Weak
  Offshore & high ground
離岸和高地:
8
  Weak

Cyclones that attained similar rating (with signal #3): MAWAR (2017), DIANMU (2016), NALGAE (2011), NANGKA (2009), DAN (1999), PENNY (1998)
相近級別之熱帶氣旋 (三號信號):瑪娃 (2017)、電母 (2016)、尼格 (2011)、浪卡 (2009)、丹尼 (1999)、彭妮 (1998)

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

TC tracks from HKO 天文台的熱帶氣旋路徑圖:

TC Track

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)

EWINIAR is the first system to necessitate tropical cyclone signals in Hong Kong this year.

After a prolonged period of dominance of the subtropical ridge in May, convective activities developed in southern South China Sea in the beginning of June. The disturbance, numbered as 99W, strengthened into tropical depression 05W on June 2. 05W was situated in the western periphery of the subtropical ridge, and was expected to move north and approach Hainan. However, there was substantial disagreement among various numerical models on its future track.

05W remained as a weak system in the next two days as it suffered from moderate to strong southwesterly vertical wind shear. It failed to gather much clouds around its centre until June 5, when shear started to relax and convective bursts could be seen developing. It took another day before 05W's spiraling characteristics became prominent, prompting the JMA to upgrade it into tropical storm EWINIAR at 8 am June 6. EWINIAR was reaching the Leizhou Peninsula at that time, and a weakening in the steering flow caused the storm to decelerate once again.

EWINIAR spent the day completing an anti-clockwise loop around Leizhou Peninsula and the Qiongzhou Strait, and made another landfall at northeastern Hainan at nighttime. Due to land interaction, EWINIAR's convections thinned but the core remained intact as could be seen on Hainan's radar images. The storm resumed its north to north-northeastward motion in the morning of June 7, and was able to intensify in northern South China Sea prior to landfall in coastal Guangdong.

According to Chinese authorities, EWINIAR made its final landfall near Yangjiang, Guangdong at around 8:30 pm June 7, carrying winds of up to force 8. Some numerical models had previously predicted EWINIAR to turn east immediately after landfall, but this did not materialize as the storm continued to move north-northeast inland. It weakened at a relatively slow pace due to the continued supply of moisture from the south, and was downgraded into a tropical storm by the HKO as late as in the afternoon of June 8. Because of the weakening ridge, EWINIAR stagnated again and turned east. It weakened into an area of low pressure near Guangzhou in the morning of June 9*. It is worth noting that the JMA retained EWINIAR's tropical storm status until 8 am June 9, when it downgraded the system north of Hong Kong.

* In HKO's TC report, EWINIAR was described to have weakened into an area of low pressure by the night of June 8.

艾雲尼為本年首個令香港天文台發出熱帶氣旋警告的系統。

經過 5 月副熱帶高壓脊長時間支配後,6 月初南海南部開始出現對流活動。熱帶擾動 99W 於 6 月 2 日增強為熱帶低氣壓 05W。05W 當時處於副高西面,預料向偏北移動並靠近海南,但各數值預報模式對其未來路徑分歧較大。

05W 於隨後兩日受中等至強烈西南垂直風切變影響而未能發展,中心附近雲層稀薄,直至 5 日垂直風切變有所放緩,05W 中心附近可見對流爆發。一日後,05W 的螺旋性轉佳,日本氣象廳於 6 日上午 8 時將其升格為熱帶風暴艾雲尼。當時艾雲尼正靠近雷州半島,而由於流場減弱,風暴再次減速移動。

艾雲尼用了一天時間,於雷州半島及瓊州海峽一帶逆時針轉了一圈,晚間於海南東北部再次登陸。受地形影響,艾雲尼的對流變得稀薄,但從海南雷達可見其中心仍然完整。艾雲尼於 7 日早上開始回復向北至東北偏北移動,並於登陸廣東沿岸前增強。

按中國官方宣佈,艾雲尼於 7 日下午 8 時 30 分左右登陸廣東陽江一帶,登陸時風力達 8 級。部分數值模式先前預測艾雲尼登陸後即轉向偏東移動,但此並未發生,風暴登陸後繼續向東北偏北移入內陸。由於南方不斷有水氣供應,艾雲尼減弱速度較慢,天文台直至 8 日下午才將其降格為熱帶低氣壓。隨著副高減弱,艾雲尼減速並轉東移,於 9 日早上在廣州附近減弱為低壓區*。值得留意的是日本氣象廳一直維持艾雲尼的熱帶風暴強度,直至 9 日上午 8 時才將其降格,路徑圖顯示當時它已到達香港以北。

* 天文台於其熱帶氣旋報告表示艾雲尼於 6 月 8 日晚減弱為低壓區。

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

Link to relevant HKO weather report bulletins: 5/66/67/68/6
香港天文台相關天氣報告連結5/66/67/68/6

EWINIAR came to within 800 km of Hong Kong on June 4. There were some scattered showers in Hong Kong on that day. The HKO issued the #1 Standby Signal at 11:20 am on June 5 when the storm was around 600 km from the territory. A rare procedural error from the Observatory allowed the signal to be displayed on its website at 10:40 am, while its mobile application even dated back the announcement to 9:25 am. The weather turned unstable as induced convections associated with EWINIAR affected the territory, and 28.2 mm of rain was recorded at the Observatory on June 5.

Heavy showers affected Hong Kong on June 6; the HKO maintained a low possibility for upgrading the signal that day and noted the erratic movement of the cyclone. The first Amber Rainstorm Warning of the year and the Special Announcement on Flooding in the Northern New Territories were issued just after 1 pm, with the former lasting until 2:50 pm and the latter 6 pm. Northeastern Hong Kong received the most rainfall that day with areas such as Tai Po reaching 150 mm, while more than 50 mm of rain was recorded over most parts of the territory. A surge in wind speed associated with the rainbands was observed later that night; strong force winds were blowing in offshore areas such as Cheung Chau, and on high grounds.

Early on June 7, the Observatory mentioned that raising the signal before 10 am would be unlikely. However, as EWINIAR was approaching and had the potential to strengthen, the Observatory later indicated a possibility of issuing a higher signal by 2 pm. The Landslip Warning was issued in the morning due to the prolonged rainfall. The #3 Strong Wind Signal was eventually issued at 12:40 pm when EWINIAR was at a distance of 330 km west-southwest of Hong Kong. Winds did not strengthen further following the issue of the signal, but strong winds were observed occasionally during the night. A waterspout was spotted in Cheung Chau towards dusk that day amidst the unstable weather.

After EWINIAR's landfall, the rainbands associated with its core propagated eastward and reached Hong Kong in the small hours of June 8. The Amber Rainstorm Warning was issued at 6:50 am; the rain was especially heavy between 8 and 9 am, but it was not until 11:30 am that the Observatory decided to raise the alert to the Red Rainstorm Warning, way after the peak of heaviest rainfall. This warning lasted only 1 hour and was replaced by the Amber warning, which was cancelled at 2:15 pm. As winds moderated in the afternoon, the #1 Standby Signal was issued at 3:40 pm to replace the #3 Signal. The #1 Signal was also cancelled at 6:20 pm. Following EWINIAR's degeneration, its rainbands also started to disintegrate and the Landslip Warning was cancelled at 3:50 pm.

The weather improved gradually over the weekend. Between June 4 and June 9, a total rainfall of 221.3 mm was recorded at the HK Observatory. This brought an end to a period of extreme dryness in middle to late May.

艾雲尼於 6 月 4 日進入香港 800 公里範圍,當天香港有零散驟雨。天文台於 5 日上午 11 時 20 分發出一號戒備信號,當時風暴距離香港約 600 公里。信號發出前天文台程序出錯,誤於上午 10 時 40 分已於網頁宣告信號生效,手機程式中更指信息於上午 9 時 25 分發出。受艾雲尼引發的對流活動影響,香港天氣轉趨不穩定,天文台當天共錄得 28.2 毫米雨量。

6 日本港有大驟雨,天文台指當天改發更高信號機會不大,並提及風暴路徑較為飄忽。本年首個黃色暴雨警告及新界北部水浸特別報告分別於下午 1 時過後發出,前者維持至下午 2 時 50 分,而後者更於下午 6 時才取消。當天新界東北部雨勢最大,大埔等地區錄得超過 150 毫米雨量,而香港大部分地區雨量亦達 50 毫米。受雨帶影響,當晚較後時間風力有所增強,高地及離岸地區如長洲吹強風。

天文台於 7 日早段表示上午 10 時前改發更高信號機會不大,但隨著艾雲尼靠近及有增強之勢,天文台之後表示會於下午 2 時前考慮改發信號。由於雨勢持續,山泥傾瀉警告於當日早上發出。三號強風信號最終於下午 12 時 40 分發出,當時艾雲尼位於香港西南偏西約 330 公里。信號生效後風勢並未進一步增強,但晚間仍間中吹強風。而不穩定天氣繼續影響本港,當天傍晚有市民於長洲發現水龍捲的蹤跡。

艾雲尼登陸後,其中心附近的雨帶向東發展,並於 8 日凌晨到達本港。天文台於上午 6 時 50 分發出黃色暴雨警告;上午 8 至 9 時左右雨勢最大,但天文台遲至上午 11 時 30 分、降雨區已開始移離本港之時才改發紅色暴雨警告。一小時後,此警告被黃色暴雨警告取代,並持續至下午 2 時 15 分取消。隨著風勢於下午減弱,天文台於下午 3 時 40 分改發一號戒備信號,繼而於下午 6 時 20 分取消該信號。而由於艾雲尼繼續消散,其雨帶亦開始瓦解,山泥傾瀉警告於下午 3 時 50 分取消。

本港天氣於周末好轉。天文台於 6 月 4 至 9 日間共錄得 221.3 毫米雨量,結束了 5 月中後期持續多時的乾旱天氣。

Image Gallery 圖片庫

Figure 1 - Numerical model predictions on May 30 indicating tropical cyclone development in the South China Sea
圖 1 - 5 月 30 日數值模式預報預示熱帶氣旋於南海發展

Figure 2 - Vertical wind shear distribution map on June 4
圖 2 - 6 月 4 日之垂直風切變分佈圖

Figure 3 - Steering flow map on June 7
圖 3 - 6 月 7 日之駛流場圖

Figure 4 - Satellite image of EWINIAR landfalling at Leizhou Peninsula on June 6
圖 4 - 6 月 6 日艾雲尼登陸雷州半島之衛星雲圖

Figure 5 - Forecast track from different official agencies on June 6
圖 5 - 6 月 6 日各官方氣象台之預測路徑

Figure 6 - Radar images at 4-hour intervals from 10 pm June 7 to 10 am June 8
圖 6 - 6 月 7 日下午 10 時至 8 日上午 10 時每四小時之雷達圖

Figure 7 - Wind speed time series at Chek Lap Kok, Cheung Chau and Tate's Cairn (top to bottom) on June 7 and 8
圖 7 - 赤鱲角、長洲及大老山 (上至下) 於 6 月 7 至 8 日之風速時間序列圖

Figure 8 - Rainfall distribution maps between June 5 and June 8
圖 8 - 6 月 5 至 8 日之雨量分佈圖

Figure 9 - Waterspout captured by HKO's webcams at Cheung Chau on June 7
圖 6 - 6 月 7 日天文台網絡攝影機拍下的水龍捲

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

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 48 km/h STRONG 強風
Cheung Chau 長洲 66 km/h GALE 烈風
Kai Tak 啟德 37 km/h Fresh 清勁
Lau Fau Shan 流浮山 33 km/h Fresh 清勁
Sai Kung 西貢 43 km/h STRONG 強風
Sha Tin 沙田 27 km/h Moderate 和緩
Ta Kwu Ling 打鼓嶺 20 km/h Moderate 和緩
Tsing Yi (SHL) 青衣蜆殼油庫 33 km/h Fresh 清勁

Number of stations recording at least STRONG force (force 6 - 7) winds: 3
Number of stations recording at least GALE force (force 8 - 9) winds: 1
Number of stations recording at least STORM force (force 10 - 11) winds: 0
Number of stations recording HURRICANE force (force 12) winds: 0

錄得 強風 (6 - 7 級) 或更高風速的站數: 3
錄得 烈風 (8 - 9 級) 或更高風速的站數: 1
錄得 暴風 (10 - 11 級) 或更高風速的站數: 0
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
18060206 119N1121E 025
18060212 123N1120E 025
18060218 127N1117E 025
18060300 132N1113E 025
18060306 144N1110E 025
18060312 152N1109E 025
18060318 155N1107E 025
18060400 157N1105E 030
18060406 158N1105E 030
18060412 160N1105E 030
18060418 167N1109E 030
18060500 175N1111E 035
18060506 184N1112E 035
18060512 197N1111E 040
18060518 204N1108E 040
18060600 204N1103E 040
18060606 201N1103E 035
18060612 199N1109E 035
18060618 203N1112E 035
18060700 208N1113E 035
18060706 210N1115E 040
18060712 215N1118E 040
18060718 221N1120E 040
18060800 227N1122E 035
18060806 233N1124E 035
18060812 236N1126E 030
18060818 236N1132E 025
18060900 237N1138E 020

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)

Station Maximum Gust Maximum Hourly Mean Wind
Direction Speed
(km/h)
Date/Month Time Direction Speed
(km/h)
Date/Month Time
Bluff Head (Stanley) SSE 67 7/6 03:45 SSE 34 8/6 14:00
Central Pier SE 49 8/6 13:16 ESE 23 7/6 20:00
Cheung Chau S 87 8/6 09:03 ESE 52 8/6 01:00
Cheung Chau Beach S 67 8/6 09:00 E 45 8/6 00:00
Hong Kong International Airport SSE 65 7/6 04:04 ESE 34 8/6 01:00
Kai Tak E 62 8/6 00:52 ESE 31 8/6 08:00
King's Park SSE 52 5/6 13:06 E 20 6/6 23:00
E 20 7/6 00:00
Lau Fau Shan SE 54 7/6 04:58 SE 25 8/6 16:00
North Point E 45 7/6 07:27 E 20 7/6 19:00
Peng Chau SE 56 7/6 10:04 ESE 30 8/6 01:00
Ping Chau SSE 38 8/6 12:16 SSE 9 8/6 15:00
Sai Kung S 67 5/6 13:09 SSE 31 8/6 09:00
Sha Chau SSW 79 8/6 07:53 SE 40 8/6 01:00
Sha Lo Wan ESE 72 8/6 01:56 ESE 31 8/6 02:00
Sha Tin SE 47 8/6 04:49 SE 19 8/6 05:00
SE 19 8/6 08:00
Shek Kong E 41 8/6 07:28 ENE 12 6/6 18:00
E 12 7/6 10:00
E 12 8/6 08:00
Star Ferry (Kowloon) E 59 7/6 03:58 ESE 31 8/6 01:00
E 31 8/6 02:00
Ta Kwu Ling E 40 8/6 02:34 ENE 14 7/6 21:00
ENE 14 8/6 00:00
Tai Mei Tuk E 54 7/6 19:59 E 30 7/6 21:00
Tai Mo Shan SE 104 7/6 04:13 SE 68 8/6 02:00
Tai Po Kau ESE 51 7/6 00:48 ESE 23 8/6 00:00
Tap Mun ESE 72 8/6 02:16 E 49 7/6 23:00
Tate's Cairn S 79 8/6 08:41 S 45 8/6 09:00
Tseung Kwan O ESE 45 8/6 00:28 E 14 8/6 01:00
Tsing Yi Shell Oil Depot SE 58 8/6 07:51 SE 27 8/6 10:00
Tuen Mun Government Offices SSE 54 7/6 03:19 SSE 22 8/6 10:00
Wetland Park S 45 7/6 04:56 SSE 16 8/6 16:00
Wong Chuk Hang SE 54 6/6 23:07 E 19 8/6 08:00

Table 3: Rainfall (in millimetres) contributed by EWINIAR 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)

Station 5-Jun 6-Jun 7-Jun 8-Jun Total Rainfall
(mm)
Hong Kong Observatory 28.2 58.3 47.4 70.2 204.1
Hong Kong International Airport (HKA) 17.8 74.4 83.4 71.9 247.5
Cheung Chau (CCH) [35.5] 134.0 [35.5] [57.0] [262.0]
H23 Aberdeen 49.0 39.0 52.0 70.0 210.0
N05 Fanling 38.5 130.5 225.5 71.0 465.5
N13 High Island 38.5 41.0 30.5 93.5 203.5
K04 Jordan Valley 39.5 52.5 107.5 124.0 323.5
N06 Kwai Chung 41.5 111.5 78.5 81.0 312.5
H12 Mid Levels 59.5 76.5 70.5 92.5 299.0
N09 Sha Tin 43.0 115.5 135.5 78.0 372.0
H19 Shau Kei Wan 36.5 70.5 76.5 118.5 302.0
SEK Shek Kong [23.5] [94.5] [68.5] 60.5 [247.0]
K06 So Uk Estate 32.0 88.5 72.0 66.0 258.5
R31 Tai Mei Tuk 41.0 189.5 70.0 100.0 400.5
R21 Tap Shek Kok 25.0 75.0 105.5 68.0 273.5

Last Accessed 最近訪問日期: Mon Dec 17 2018 19:40:17 HKT
Last Modified 最近修訂日期: Mon Jul 09 2018

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