PEWA is expected to go north along the western periphery of the subtropical ridge.
PEWA 將沿副熱帶高壓脊西部向北移動。
Intensity
Analysis 強度分析
Current T-number: T2.0/2.0/S0.0/24 HRS
PEWA's low-level circulation centre is fully exposed and clouds are thinning out. The storm is expected to weaken and dissipate in poor environment before having the opportunity to undergo extratropical transition.
現時的 T 號碼: T2.0/2.0/S0.0/24 HRS
PEWA 的低層環流中心完全暴露，且雲層轉薄，預料它將於較差大氣環境下減弱消散，而不會轉化為溫帶氣旋。
Effects on
Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
PEWA 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
This is the final bulletin on PEWA.
這是本站對 PEWA 的最後一次發佈。
Other Images
其他圖像
JTWC Track 聯合颱風警報中心路徑圖
JMA Track 日本氣象廳路徑圖
HKO Satellite 香港天文台衛星圖
HKO Track 香港天文台路徑圖
Probabilities
of TC Signals from HKO 香港天文台發出 / 取消熱帶氣旋警告信號的機率
N/A 不適用
Past Bulletins (click on the bulletin no. for the contents) 過往報告
(請按發佈編號顯示內容)
PEWA will gradually turn poleward again as the eastern ridge resumes dominance.
於 PEWA 東面的脊場將逐漸帶領風暴轉往偏北移動。
Intensity
Analysis 強度分析
Current T-number: T2.0/2.5/W0.5/24 HRS
PEWA's low-level circulation centre is fully exposed and clouds are thinning out. The storm is now forecast to weaken and dissipate in poor environment before having the opportunity to undergo extratropical transition.
現時的 T 號碼: T2.0/2.5/W0.5/24 HRS
PEWA 的低層環流中心完全暴露，且雲層轉薄，預料它將於較差大氣環境下減弱消散，而不會轉化為溫帶氣旋。
Effects on
Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
PEWA 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
2013/08/26 (Mon 一), afternoon 下午 (or earlier 或更早)
Other Images
其他圖像
JTWC Track 聯合颱風警報中心路徑圖
JMA Track 日本氣象廳路徑圖
HKO Satellite 香港天文台衛星圖
HKO Track 香港天文台路徑圖
Probabilities
of TC Signals from HKO 香港天文台發出 / 取消熱帶氣旋警告信號的機率
PEWA is expected to move slowly in the next 48 hours within a pressure col, generally towards the WNW. As the trough digs deeper, PEWA will be able to escape from the col and recurve.
Current T-number: T2.5/2.5/S0.0/24 HRS
Vertical wind shear continued to decrease, but PEWA appears disorganized. The storm is expected to maintain intensity over the next 48 hours with some chance of intensifying slightly. Thereafter sea temperatures will drop quickly and the storm will weaken. Extratropical transition is expected four days later.
現時的 T 號碼:T2.5/2.5/S0.0/24 HRS
垂直風切變繼續下降，但 PEWA 結構仍然鬆散。預料風暴會於未來 48 小時維持強度或稍為增強，隨後由於海溫下降而減弱，並於四天後轉化為溫帶氣旋。
Effects on
Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
PEWA 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
2013/08/25 (Sun 日), afternoon 下午 (or earlier 或更早)
Other Images
其他圖像
JTWC Track 聯合颱風警報中心路徑圖
JMA Track 日本氣象廳路徑圖
HKO Satellite 香港天文台衛星圖
HKO Track 香港天文台路徑圖
Probabilities
of TC Signals from HKO 香港天文台發出 / 取消熱帶氣旋警告信號的機率
The subtropical ridge has weakened and PEWA is expected to travel with reduced speed in the next 48 hours. Current forecast calls for a recurvature as the ridge to the right of PEWA dominates.
Current T-number: T2.5/2.5/S0.0/24 HRS
Vertical wind shear has dropped and may allow some development. As the storm reaches 30°N, however, ocean heat content will decrease more rapidly and the storm will weaken. It is expected to transform into an extratropical cyclone beyond t+96.
The weakening of the ridge north of PEWA will create a col in which PEWA will stagnate beyond t+48.
PEWA 以北的副熱帶高壓脊正減弱，這會造成一鞍場，PEWA 將會於 48 小時後處於停滯狀態。
Intensity
Analysis 強度分析
Current T-number: T2.5/3.0/S0.0/24 HRS
Shear is still very high northwest of PEWA and is responsible for the continual displacement of its deep-layer convections to the northeast. This situation is not expected to alleviate drastically, but the reorientation of the ridge and the improvement of outflow from the arriving trough may help PEWA to intensify slightly near t+48.
現時的 T 號碼: T2.5/3.0/S0.0/24 HRS
PEWA 西北方垂直風切變仍非常高，這導致其深層對流持續向東北切離。預料此情況將不會大幅改善，但隨著副高改變型態且西風槽到來令輻散改善，PEWA 或可於 t+48 附近稍為增強。
Effects on
Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
PEWA 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
2013/08/23 (Fri 五), afternoon 下午 (or earlier 或更早)
Other Images
其他圖像
JTWC Track 聯合颱風警報中心路徑圖
JMA Track 日本氣象廳路徑圖
HKO Satellite 香港天文台衛星圖
HKO Track 香港天文台路徑圖
Probabilities
of TC Signals from HKO 香港天文台發出 / 取消熱帶氣旋警告信號的機率
PEWA is forecast to move NW along the periphery of the subtropical ridge. The ridge is expected to weaken two to three days later, which will see PEWA remain stagnant at later taus.
Current T-number: T2.5/3.0/W0.5/24 HRS
Vertical wind shear is still causing PEWA to weaken but some convective bursts near the centre were observed over the past few hours. As the ridge weakens, shear is expected to relax and together with improved outflow there should be some room for intensification.
PEWA is forecast to move NW along the periphery of the subtropical ridge. Some numerical models are predicting a weakening and reorientation of the ridge 3 to 4 days later and PEWA will then decelerate.
Current T-number: T3.0/3.5/W1.0/24 HRS
PEWA entered a high shear zone which accounted for its decrease in intensity. As sea temperatures are high and outflow should improve due to a passing trough, the storm is still expected to intensify slightly at later taus.
現時的 T 號碼: T3.0/3.5/W1.0/24 HRS
PEWA 進入高垂直風切變地區，因此開始減弱。由於海溫仍高，且西風槽到來有助提升高層輻散，預料 PEWA 仍能於預測後期略為增強。
Effects on
Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
PEWA 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
2013/08/21 (Wed 三), afternoon 下午 (or earlier 或更早)
Other Images
其他圖像
JTWC Track 聯合颱風警報中心路徑圖
JMA Track 日本氣象廳路徑圖
HKO Satellite 香港天文台衛星圖
HKO Track 香港天文台路徑圖
Probabilities
of TC Signals from HKO 香港天文台發出 / 取消熱帶氣旋警告信號的機率
Tropical cyclone PEWA, the first cyclone formed in central north Pacific this year, entered the northwestern Pacific yesterday, and intensified into a typhoon today. At 2 pm, PEWA was centred about 1350 km (730 NM) ESE of Wake Island.
PEWA is forecast to move NW along the periphery of the subtropical ridge. Some numerical models are predicting a weakening and reorientation of the ridge 4 to 5 days later and PEWA will then decelerate.
Current T-number: T4.0/4.0/INT OBS
An eye was visible briefly, and convective banding justifies its typhoon strength. The storm is expected to intensify gradually in generally good environmental conditions.
現時的 T 號碼: T4.0/4.0/INT OBS
PEWA 的風眼曾短暫可見，而其對流旋捲度顯示風暴達颱風強度。預料在大致良好的大氣環境中風暴會逐漸增強。
Effects on
Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
PEWA 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
2013/08/20 (Tue 二), afternoon 下午 (or earlier 或更早)
Other Images
其他圖像
JTWC Track 聯合颱風警報中心路徑圖
JMA Track 日本氣象廳路徑圖
HKO Satellite 香港天文台衛星圖
HKO Track 香港天文台路徑圖
Probabilities
of TC Signals from HKO 香港天文台發出 / 取消熱帶氣旋警告信號的機率
Active Tropical Cyclone(s) 正活躍之熱帶氣旋
