VAMCO has transformed into an extratropical cyclone. At 08 HKT, VAMCO was centred about 2880 km (1560 NM) NE of Tokyo.
環高已轉化為溫帶氣旋。在 08 HKT，環高集結在東京東北約 2880 公里 (1560 海里)。
TC Naming 氣旋命名
VAMCO is the 84th name in the tropical cyclone name list and was contributed by Vietnam. It is the name of a river in the southwestern part of the country which originates from Cambodia. This name was last used in 2003.
VAMCO is the 84th name in the tropical cyclone name list and was contributed by Vietnam. It is the name of a river in the southwestern part of the country which originates from Cambodia. This name was last used in 2003.
VAMCO is the 84th name in the tropical cyclone name list and was contributed by Vietnam. It is the name of a river in the southwestern part of the country which originates from Cambodia. This name was last used in 2003.
VAMCO is expected to recurve in the northwestern periphery of the subtropical ridge, and is expected to accelerate.
預料環高將沿東部副熱帶高壓脊西北面逐漸轉向東北移動，移速將會加快。
Intensity Analysis 強度分析
Current T-number: T4.5/5.0/W0.5/24 HRS
Lower sea surface temperatures will cause VAMCO's weakening trend to continue. Extratropical transition is expected to start near t+24.
現時的 T 號碼: T4.5/5.0/W0.5/24 HRS
預料環高將受較低海溫影響而繼續減弱，並於約 24 小時後開始溫帶氣旋轉化。
Effects on Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
環高於未來的 72 小時將不會對香港構成任何影響。
Next Update 下次更新
19 HKT, 2009/08/25 (or earlier 或更早)
Probabilities of TC Signals from HKO 香港天文台 (已) 發出 / 取消熱帶氣旋警告信號的機率
VAMCO is the 84th name in the tropical cyclone name list and was contributed by Vietnam. It is the name of a river in the southwestern part of the country which originates from Cambodia. This name was last used in 2003.
VAMCO is expected to travel N along the western periphery of the eastern subtropical ridge. Recurvature will occur soon after VAMCO traverses the ridge axis.
預料環高將沿東部副熱帶高壓脊西面向北移動，當其越過副高脊線時將開始轉向。
Intensity Analysis 強度分析
Current T-number: T5.0/5.0/S0.0/24 HRS
Lower sea surface temperatures will cause VAMCO's weakening trend to continue. Extratropical transition is expected to start between t+36 and t+48.
現時的 T 號碼: T5.0/5.0/S0.0/24 HRS
預料環高將受較低海溫影響而繼續減弱，並於 36 至 48 小時後開始溫帶氣旋轉化。
Effects on Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
環高於未來的 72 小時將不會對香港構成任何影響。
Next Update 下次更新
19 HKT, 2009/08/24 (or earlier 或更早)
Probabilities of TC Signals from HKO 香港天文台 (已) 發出 / 取消熱帶氣旋警告信號的機率
VAMCO is the 84th name in the tropical cyclone name list and was contributed by Vietnam. It is the name of a river in the southwestern part of the country which originates from Cambodia. This name was last used in 2003.
VAMCO is expected to travel NNW along the western periphery of the eastern subtropical ridge. Upon reaching the ridge axis at around 30°N, a typical recurvature scenario follows.
預料環高將沿東部副熱帶高壓脊西面向西北偏北移動，當其越過位於北緯 30 度附近的脊線時將開始轉向。
Intensity Analysis 強度分析
Current T-number: T5.0/6.0/W1.0/24 HRS
Cloud top temperatures near the eyewall have risen. It is expected that heightened shear and lower sea surface temperatures will cause VAMCO to weaken. Extratropical transition will start between t+48 and t+72.
現時的 T 號碼: T5.0/6.0/W1.0/24 HRS
環高眼牆附近的雲頂溫度升高。預料環高將受較低海溫和較高垂直風切變影響而減弱，並於 48 至 72 小時後開始溫帶氣旋轉化。
Effects on Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
環高於未來的 72 小時將不會對香港構成任何影響。
Next Update 下次更新
19 HKT, 2009/08/23 (or earlier 或更早)
Probabilities of TC Signals from HKO 香港天文台 (已) 發出 / 取消熱帶氣旋警告信號的機率
VAMCO is the 84th name in the tropical cyclone name list and was contributed by Vietnam. It is the name of a river in the southwestern part of the country which originates from Cambodia. This name was last used in 2003.
VAMCO is expected to travel NNW along the western periphery of the eastern subtropical ridge. Upon reaching the ridge axis at around 30°N, a typical recurvature scenario follows.
預料環高將沿東部副熱帶高壓脊西面向西北偏北移動，當其越過位於北緯 30 度附近的脊線時將開始轉向。
Intensity Analysis 強度分析
Current T-number: T6.0/6.0/D0.5/24 HRS
VAMCO has almost reached the maximum intensity that can be supported by ambient environments. It is expected that VAMCO will maintain strength in the next day or two, after which heightened shear and lower sea surface temperatures will cause VAMCO to weaken.
現時的 T 號碼: T6.0/6.0/D0.5/24 HRS
環高已差不多達到附近環境所能容納的極限強度。預料環高的強度將於未來 24 至 48 小時維持，其後將受較低海溫和較高垂直風切變影響而減弱。
Effects on Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
環高於未來的 72 小時將不會對香港構成任何影響。
Next Update 下次更新
23 HKT, 2009/08/22 (or earlier 或更早)
Probabilities of TC Signals from HKO 香港天文台 (已) 發出 / 取消熱帶氣旋警告信號的機率
VAMCO is the 84th name in the tropical cyclone name list and was contributed by Vietnam. It is the name of a river in the southwestern part of the country which originates from Cambodia. This name was last used in 2003.
A weakness has developed within the subtropical ridge, breaking it into two halves. VAMCO is expected to travel NW/NNW along the southwestern (turning to western) periphery of the eastern ridge. Upon reaching the ridge axis at around 30°N, a typical recurvature scenario follows.
Current T-number: T5.5/5.5/D1.5/24 HRS
Favourable outflow persists. VAMCO is expected to strengthen into a category 4 typhoon in the next 24 to 48 hours, after which a weakening trend follows as it travels into cooler water.
現時的 T 號碼: T5.5/5.5/D1.5/24 HRS
環高輻散繼續良好，預料將於未來 24 至 48 小時內增強至四級颱風。其後當環高繼續北移，它將開始受較低海溫影響而減弱。
Effects on Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
環高於未來的 72 小時將不會對香港構成任何影響。
Next Update 下次更新
19 HKT, 2009/08/21 (or earlier 或更早)
Probabilities of TC Signals from HKO 香港天文台 (已) 發出 / 取消熱帶氣旋警告信號的機率
VAMCO has strengthened into a typhoon. At 14 HKT, VAMCO was centred about 1460 km (790 NM) ENE of Guam.
環高今天增強為颱風。在 14 HKT，環高集結在關島東北偏東約 1460 公里 (790 海里)。
TC Naming 氣旋命名
VAMCO is the 84th name in the tropical cyclone name list and was contributed by Vietnam. It is the name of a river in the southwestern part of the country which originates from Cambodia. This name was last used in 2003.
VAMCO's movement remained slow due to the lack of steering force. It is expected to track north turning to northwest slowly in the next 72 hours. A weakness is expected to develop later in the ridge which will make VAMCO turn poleward again.
11W intensified into a tropical storm last night and was named VAMCO by the JMA. It further intensified into a severe tropical storm tonight. At 20 HKT, VAMCO was centred about 1380 km (740 NM) ENE of Guam.
VAMCO is the 84th name in the tropical cyclone name list and was contributed by Vietnam. It is the name of a river in the southwestern part of the country which originates from Cambodia. This name was last used in 2003.
VAMCO is expected to track NNW along the southwestern periphery of the subtropical ridge, the orientation of which will allow VAMCO to briefly track NW before turning poleward.
預料環高將沿副熱帶高壓脊西南面向西北偏北轉西北移動，稍後將由於到達副高西方而轉向偏北移動。
Intensity Analysis 強度分析
Current T-number: T3.5/3.5/D1.0/24 HRS
VAMCO has good outflow channels and is situated in warm seas. Gradual intensification is expected.
現時的 T 號碼: T3.5/3.5/D1.0/24 HRS
環高輻散良好，附近海溫偏高。預料環高將繼續增強。
Effects on Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
環高於未來的 72 小時將不會對香港構成任何影響。
Next Update 下次更新
19 HKT, 2009/08/19 (or earlier 或更早)
Probabilities of TC Signals from HKO 香港天文台 (已) 發出 / 取消熱帶氣旋警告信號的機率
11W is expected to track WNW along the southern periphery of the subtropical ridge north of the system. A break is expected to appear in the ridge later allowing 11W to recurve.
Active Tropical Cyclone(s) 正活躍之熱帶氣旋
