天氣小觀:東隅已逝,桑榆非晚;多颱之秋,梅花再開 - 颱風討論
By Ingrid
at 2022-09-10T18:36
at 2022-09-10T18:36
Table of Contents
天氣小觀:東隅已逝,桑榆非晚;多颱之秋,梅花再開
秋月如珪,梅花非花,
誰也沒想到短短一週的東亞南方入秋大環境,
西太平洋竟能一字排開颱風、熱帶性低氣壓、熱帶擾動通通來,
帶頭的梅花颱風更是即將接近台灣,海上警報甚至陸上警報又要發布囉。
只能說,
類東北季風真是興奮劑,
軒蘭諾颱風讓季風槽深入西太平洋,儘管太平洋高壓嘗試復原,
但北方入秋大環境的西風槽卻又適時地於揮劍斬擊,
畢竟與季風槽爭地是家務事,太平洋高壓只能先處理外敵西風槽,
於是今天,季風槽一字排開14W梅花、92W、93W。
秋天颱風,往往要考慮的是兩個字:滯留
秋季的大氣環境特色由地面冬季系統率先發動,地面變化快於高空變化;
於是,地面場的偏北風與偏南風頻頻相遇,
導致秋天的颱風地面場和北方系統互動,高空場卻和南方系統互動,
如果沒有西風槽勾引轉性,
還真的不知道"秋天颱風"到底要幹嘛哩..
而梅花颱風所處環境,日本有一個太平洋分裂高壓單體勢力,
因此理當受太平洋高壓導引向西北移動,然而,東亞有一大型高空冷渦旋,
想當然太平洋高壓不會順利西伸,
但孟加拉灣的高空反氣旋暖脊延伸後向東擠壓東亞的高空渦旋,
東亞的高空渦旋剩兩條路可走,
1. 併入西風槽
2. 繼續橫在東亞
因此,
從太平洋高壓觀點來看,有顆大石頭障礙,希望可以把它丟進水裡!
從高空冷渦旋觀點來看,南方有個討厭梅花,高空釋放潛熱,不愛!
從南亞暖脊觀點來看,我想和太平洋高壓結合,這障礙好像要斬除!
最終,
從梅花颱風觀點來看,
太平洋高壓導引要我去哪,看起來西伸,應該向西走,
不對!
東亞有個高空冷渦旋,那應該往北走,
又不對,
南亞暖脊好像把高空冷渦旋切斷了,南亞暖脊和太平洋高壓結合,
那應該往西走了,
好吧,
這到底是甚麼情況呢,神鬼莫測的秋季大環境,
台灣今傍晚天空已發紅,反正就是過來囉。
(以上說說囉)
--
秋月如珪,梅花非花,
誰也沒想到短短一週的東亞南方入秋大環境,
西太平洋竟能一字排開颱風、熱帶性低氣壓、熱帶擾動通通來,
帶頭的梅花颱風更是即將接近台灣,海上警報甚至陸上警報又要發布囉。
只能說,
類東北季風真是興奮劑,
軒蘭諾颱風讓季風槽深入西太平洋,儘管太平洋高壓嘗試復原,
但北方入秋大環境的西風槽卻又適時地於揮劍斬擊,
畢竟與季風槽爭地是家務事,太平洋高壓只能先處理外敵西風槽,
於是今天,季風槽一字排開14W梅花、92W、93W。
秋天颱風,往往要考慮的是兩個字:滯留
秋季的大氣環境特色由地面冬季系統率先發動,地面變化快於高空變化;
於是,地面場的偏北風與偏南風頻頻相遇,
導致秋天的颱風地面場和北方系統互動,高空場卻和南方系統互動,
如果沒有西風槽勾引轉性,
還真的不知道"秋天颱風"到底要幹嘛哩..
而梅花颱風所處環境,日本有一個太平洋分裂高壓單體勢力,
因此理當受太平洋高壓導引向西北移動,然而,東亞有一大型高空冷渦旋,
想當然太平洋高壓不會順利西伸,
但孟加拉灣的高空反氣旋暖脊延伸後向東擠壓東亞的高空渦旋,
東亞的高空渦旋剩兩條路可走,
1. 併入西風槽
2. 繼續橫在東亞
因此,
從太平洋高壓觀點來看,有顆大石頭障礙,希望可以把它丟進水裡!
從高空冷渦旋觀點來看,南方有個討厭梅花,高空釋放潛熱,不愛!
從南亞暖脊觀點來看,我想和太平洋高壓結合,這障礙好像要斬除!
最終,
從梅花颱風觀點來看,
太平洋高壓導引要我去哪,看起來西伸,應該向西走,
不對!
東亞有個高空冷渦旋,那應該往北走,
又不對,
南亞暖脊好像把高空冷渦旋切斷了,南亞暖脊和太平洋高壓結合,
那應該往西走了,
好吧,
這到底是甚麼情況呢,神鬼莫測的秋季大環境,
台灣今傍晚天空已發紅,反正就是過來囉。
(以上說說囉)
--
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