Please click here for the plain text version of the track data. 請按此觀看純文字資料。
Overview 總覽
Other images 其他圖像
JTWC Track 聯合颱風警報中心路徑圖
JMA Track 日本氣象聽路徑圖
HKO Satellite 香港天文台衛星圖
RAMMASUN intensified slightly last night, making it a super typhoon with wind speed of 135 knots. It has weakened since then and is now a category 4 typhoon. At 14 HKT, RAMMASUN was situated about 1030 km (560 NM) WSW of Iwo Jima.
RAMMASUN is about to turn NE as it crosses the ridge axis. It will maintain its northeasterly movement along the northwest periphery of the subtropical ridge in the rest of the forecast period.
威馬遜即將轉向東北移動。預料在餘下時間威馬遜將沿副熱帶高壓脊的西北部向東北加速移動。
Intensity Analysis 強度分析
Current T-number: T6.0/6.5/W0.5/24 HRS
Wind shear will strengthen as RAMMASUN is subject to the westerlies. Coupled with lower sea surface temperatures and entrainment of drier air RAMMASUN will weaken and will start extratropical transition in a baroclinic environment.
現時的 T 號碼: T6.0/6.5/W0.5/24 HRS 隨著垂直風切變增強，海水漸冷和更多乾空氣的入侵，預料威馬遜將逐漸減弱並在斜壓環境下轉化為溫帶氣旋。
Effects on Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
威馬遜於未來的72小時將不會對香港構成任何影響。
Next Update 下次更新
19 HKT, 2008/05/12 (or earlier 或更早)
Probabilities of TC Signals from HKO 香港天文台(已)發出熱帶氣旋警告信號的機率
Please click here for the plain text version of the track data. 請按此觀看純文字資料。
Overview 總覽
Other images 其他圖像
JTWC Track 聯合颱風警報中心路徑圖
JMA Track 日本氣象聽路徑圖
HKO Satellite 香港天文台衛星圖
RAMMASUN intensified rapidly last night and a round, symmetric eye is developed. At 14 HKT, RAMMASUN was situated about 1370 km (740 NM) SW of Iwo Jima.
RAMMASUN is now tracking along the weakness in the subtropical ridge induced by an arriving mid-latitude trough. It is expected that RAMMASUN will accelerate and turn NE once it crosses the ridge axis at around 20N.
Current T-number: T6.5/6.5/D2.0/24 HRS
There is virtually no vertical wind shear at where RAMMASUN is situated. Also, as the sea surface temperature at where RAMMASUN is located is very suitable for storm strengthening and the poleward outflow channels keep improving due to the trough that deepens the weakness in the subtropical ridge, it is expected that RAMMASUN can maintain strength or even strengthen a bit before recurvature. Extratropical transition is expected in extended forecast period.
現時的 T 號碼: T6.5/6.5/D2.0/24 HRS 威馬遜附近幾乎沒有垂直風切變。另外由於威馬遜附近的水溫頗高，而西風槽亦將令威馬遜高空輻散轉好，預料該系統將在轉向前維持強度或作少許增強。在轉向以後預料威馬遜將轉化為溫帶氣旋。
Effects on Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
威馬遜於未來的72小時將不會對香港構成任何影響。
Next Update 下次更新
19 HKT, 2008/05/11 (or earlier 或更早)
Probabilities of TC Signals from HKO 香港天文台(已)發出熱帶氣旋警告信號的機率
Please click here for the plain text version of the track data. 請按此觀看純文字資料。
Overview 總覽
Other images 其他圖像
JTWC Track 聯合颱風警報中心路徑圖
JMA Track 日本氣象聽路徑圖
HKO Satellite 香港天文台衛星圖
RAMMASUN's large area of convection consolidated today and a banding eye is developing. The storm also reached typhoon status earlier today. At 14 HKT, RAMMASUN was situated about 710 km (380 NM) WNW of Yap.
RAMMASUN is now tracking along the weakness in the subtropical ridge induced by an arriving mid-latitude trough. It is expected that RAMMASUN will accelerate and turn NE once it crosses the ridge axis at around 20N.
Current T-number: T4.5/4.5/D1.5/24 HRS
As the sea surface temperature at where RAMMASUN is located is very suitable for storm strengthening and the poleward outflow channels keep improving due to the trough that deepens the weakness in the subtropical ridge, it is expected that RAMMASUN can intensify further into a category 3 typhoon later. Extratropical transition is expected in extended forecast period.
現時的 T 號碼: T4.5/4.5/D1.5/24 HRS
由於威馬遜附近的水溫頗高，而西風槽亦將令威馬遜高空輻散轉好，預料該系統將在轉向前繼續增強至三級颱風強度。在轉向以後預料威馬遜將轉化為溫帶氣旋。
Effects on Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
威馬遜於未來的72小時將不會對香港構成任何影響。
Next Update 下次更新
19 HKT, 2008/05/10 (or earlier 或更早)
Probabilities of TC Signals from HKO 香港天文台(已)發出熱帶氣旋警告信號的機率
RAMMASUN has started its poleward turn earlier than forecast, and from steering charts the weakness in the subtropical ridge has widened. It is expected that the ridge will retreat further to the east and allow RAMMASUN to move poleward in the first half of the forecast period, after which it will encounter the westerlies and gradually turn northeastward towards the seas southeast of Japan.
Current T-number: T3.0/3.0/D0.5/24 HRS
As the sea surface temperature at where RAMMASUN is located is very suitable for storm strengthening (near 30 degrees) and the poleward outflow channels keep improving due to the trough that deepens the weakness in the subtropical ridge, it is expected that RAMMASUN can gradually attain typhoon strength as it travels northwards. Extratropical transition is expected in extended forecast period.
現時的 T 號碼: T3.0/3.0/D0.5/24 HRS
由於威馬遜附近的水溫頗高，而西風槽亦將令威馬遜高空輻散轉好，預料該系統可以在其北移的過程中增強至颱風程度。在轉向以後預料威馬遜將轉化為溫帶氣旋。
Effects on Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
威馬遜於未來的72小時將不會對香港構成任何影響。
Next Update 下次更新
19 HKT, 2008/05/09 (or earlier 或更早)
Probabilities of TC Signals from HKO 香港天文台(已)發出熱帶氣旋警告信號的機率
Please click here for the plain text version of the track data. 請按此觀看純文字資料。
Overview 總覽
Other images 其他圖像
JTWC Track 聯合颱風警報中心路徑圖
JMA Track 日本氣象聽路徑圖
HKO Satellite 香港天文台衛星圖
The disturbance 94W has strengthened into a tropical depression earlier today, and is now a tropical storm. JTWC has given it a temporary number of 03W. At 20 HKT, 03W was situated about 700 km (380 NM) WSW of Yap.
The subtropical ridge to the north of 03W has developed a weakness directly above the system. It is expected that the ridge will retreat further to the east and allow 03W to move poleward in the first half of the forecast period. Currently the extended forecast calls for a recurvature along the northwestern periphery of the retreated ridge, which is the scenario predicted by most numerical forecast models.
Current T-number: T2.5/2.5/INT OBS
As the sea surface temperature at where 03W is located is very suitable for storm strengthening (near 30 degrees), it is expected that 03W can gradually attain typhoon strength as it travels northwards.
現時的 T 號碼: T2.5/2.5/INT OBS
由於 03W 附近的水溫頗高，預料該系統可以在其北移的過程中增強至颱風程度。
Effects on Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
03W 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, 2008/05/08 (or earlier 或更早)
Probabilities of TC Signals from HKO 香港天文台(已)發出熱帶氣旋警告信號的機率
Active Tropical Cyclone(s) 正活躍之熱帶氣旋
