HAITANG has started to move west. At 20 HKT, HAITANG was centred about 200 km (110 NM) ENE of Da Nang.
海棠開始西移。在下午 8 時，海棠集結在峴港東北偏東約 200 公里 (110
海里)。
TC
Naming 氣旋命名
HAITANG is the 128th name in the tropical cyclone name list. It was contributed by China, meaning Chinese crabapple. This name was last used in 2005.
海棠為熱帶氣旋名稱列表中第 128 個名字，由中國提供，為一種花。這個名稱曾於 2005 年使用。
Movement
Analysis 路徑分析
Under the influence of a ridge in southern China, HAITANG is expected to move west and make landfall in central Vietnam tomorrow morning.
受中國南部一道高壓脊的影響，預料海棠向西移動並於明早登陸越南。
Intensity
Analysis 強度分析
Current T-number: T2.5/2.5/S0.0/24 HRS
HAITANG is expected to remain as a tropical storm until landfall, after which it will gradually weaken and dissipate.
現時的 T 號碼: T2.5/2.5/S0.0/24 HRS
預料海棠將維持熱帶風暴強度直至登陸，其後逐步減弱並消散。
Effects on
Hong Kong 對香港的影響
No threat to Hong Kong is expected within the next 72 hours.
海棠於未來的 72 小時將不會對香港構成任何影響。
Next Update
下次更新
23 HKT, 2011/09/27 (Tue 二) 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 (已) 發出 / 取消熱帶氣旋警告信號的機率
HAITANG is the 128th name in the tropical cyclone name list. It was contributed by China, meaning Chinese crabapple. This name was last used in 2005.
海棠為熱帶氣旋名稱列表中第 128 個名字，由中國提供，為一種花。這個名稱曾於 2005 年使用。
Movement
Analysis 路徑分析
Under the influence of a developing ridge in southern China, HAITANG is expected to move west and make landfall in central Vietnam.
受中國南部一道正發展之高壓脊的影響，預料海棠向西移動並登陸越南。
Intensity
Analysis 強度分析
Current T-number: T2.5/2.5/D0.5/24 HRS
Shear is rather high in HAITANG's vicinity. Together with proximity to land, HAITANG is not expected to strengthen significantly before landfall.
現時的 T 號碼: T2.5/2.5/D0.5/24 HRS
海棠附近風切較高。同時，由於海棠靠近陸地，預料它將不會明顯增強。
Effects on
Hong Kong 對香港的影響
The combined effect of HAITANG and the northeast monsoon will continue to bring rain and strong easterly winds to Hong Kong tomorrow.
受海棠和東北季候風的共同影響，香港將於明天繼續吹強風程度東風並有雨。
Next Update
下次更新
23 HKT, 2011/09/26 (Mon 一) 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 (已) 發出 / 取消熱帶氣旋警告信號的機率
By issuing the Strong Monsoon Signal, the Observatory is considering the northeast monsoon as the dominant reason for the strong winds observed in Hong Kong. Tropical cyclone signals are therefore not expected.
Tropical disturbance 97W in the South China Sea has intensified into tropical depression 21W. At 20 HKT, 21W was centred about 810 km (440 NM) SSW of Hong Kong.
21W is under a weak steering environment. Together with multiple competing vortices, it may show irregular movement in the next 24 hours. A ridge in southern China is expected to push 21W westward starting from t+24 to t+36. 21W should make landfall at Vietnam in two to three days' time.
Current T-number: T2.0/2.0/INT OBS
Being a monsoon depression, 21W has larger winds in its periphery. Such storms are known to take extremely long time to develop. Together with 21W's proximity to land, intensification should be limited.
現時的 T 號碼: T2.0/2.0/INT OBS
21W 為季風低壓，風暴周邊風力較大。季風低壓發展緩慢，且由於 21W 靠近陸地，預料它將不會大幅增強。
Effects on
Hong Kong 對香港的影響
The combined effect of 21W and the northeast monsoon will result in fresh to strong east to northeasterly winds in Hong Kong. Convections associated with 21W could also bring unsettled weather to the region.
受 21W 和東北季候風的共同影響，香港將吹清勁至強風程度東至東北風，而天氣會變得不穩定。
Next Update
下次更新
23 HKT, 2011/09/25 (Sun 日) 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 (已) 發出 / 取消熱帶氣旋警告信號的機率
Signal 信號
t+12
t+24
t+36
t+48
t+60
t+72
Standby 戒備 #1
Low 低
Low 低
Low 低
Strong Wind 強風 #3
Gale/Storm 烈或暴風 #8
G/S Incr. 烈或暴風增強 #9
Hurricane 颶風 #10
Notes 註:
1) For issuance, "Signal" column represents having issued that signal or above. 有關發出機率，首欄指已發出該信號或更高信號。
2) "Low" = Probability from 5 to 20 per cent; "Medium" = 20 to 50%; "High" = 50 to 80%; "V High" = 80% or above.
"低" = 5% - 20% 的機率; "中等" = 20 - 50%; "高" = 50 - 80%; "極高" = 80% 或以上。
Active Tropical Cyclone(s) 正活躍之熱帶氣旋
