風雨飄搖的2007年秋天即將來臨?

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  • #8097

    Just done page on the site re Pabuk, inc some photos and video clips from Cheung Chau, ferry from CC to Hong Kong Island:
    回來的孩子帕布克

    #8098

    Well, been quite a while since Pabuk – and with lull in tropical storms in this region, seemed my notion that may have stormy autumn was to prove completely wrong.

    Yet now, storms forming again – and Typhoon Wipha headed towarsd Shanghai, as looks possible there could be tropical storm for S China Sea next week.

    La Nina is evidently developing: waters cooler than normal in eastern Pacific, warmer than normal in western Pacific.
    WIth such conditions, tend to have tropical storms form west of normal, so more chance for hitting coasts from Vietnam to e China:
    An INTERVIEW with Professor Johnny Chan

    Here’s page where you can see maps showing recent sea surface temperatures in Pacific, and deviations from the norm.
    Tropical Pacific Sea Surface Temperature Animation

    Tropical storms need sea surface temps of over around 26.5C; west Pacific waters currently to over 30C in places, so plenty warm enough to form storms.
    Other factors invmportant too, like wind shear, which can destroy storms. Now, seems some convection in west Pacific: about right for creating storms.
    Waters should cool as and when winter monsoons really start blowing; but they’ve been weaker of late, not so chill, so wonder if may form storms later than normal.

    #8099

    今天早些時候在長洲閒逛,風很大。
    部分是東北季風,但也有強烈的熱帶風暴利奇馬圍繞我們西南南部,向海南移動。

    查看香港天文台各氣象站的資料,可以看到今早風力普遍增強。在長洲,有時(超過 10 分鐘)平均時速超過 60 公里/小時,所以剛剛達到大風強度。昂坪有時會超過颶風強度(平均時速118公里),高峰期10分鐘平均時速在早上6點左右達到140公里/小時。

    在Weather Underground 論壇上,有一些討論是這樣的:當風完全在T3 信號範圍內並且在達到大風(即8 號)的地方時,為什麼只發出強季風信號?那裡的觀念是,現在觀測站不喜歡發布颱風/熱帶風暴信號;還想知道人們是否可能對只有季風信號的天氣過於放鬆。
    好吧,讓我們看看——結果會不會有很多人出去做了一些如果 T3 發行的話他們不會做的事情,然後遇到了一些問題?此外,如果 Lekima 靠近 - 特別是如果雨帶和狂風越來越近 - 可以查看 Obs 是否切換到 T3。

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