天氣速觀:諾盧颱風的類/準共伴效應 - 颱風討論
By Hamiltion
at 2022-09-25T14:40
at 2022-09-25T14:40
Table of Contents
共伴效應高空場就是颱風、太平洋高壓、西風槽
地面場就是冷高壓、颱風、太平洋高壓。
目前地面場來看,
台灣南方的諾盧颱風正通過呂宋島,
台灣北方從東北亞、東亞沿海到東亞內陸整片都是冷高壓區,
再從高空場來看,
西風槽位於長江流域,太平洋高壓單體中心位於日本南方,
這種配置可以說是準共伴效應的配置,
差別在於冷高壓弱了些,西風槽和太平洋高壓稍微偏北了些,
因此,不見傳統共伴鋒面的出現,反而比較像是一般的輻合/類共伴。
事實上,
預報一開始也認為高空配置偏北,即使出現類共伴時間很短,
然而,一切就是始於諾盧颱風的快速發展。
諾盧颱風的快速發展,帶上來大量水氣並加速太平洋高壓的偏東氣流,
同時,也與冷高壓南下的類東北季風輻合在西側外圍環流,
因此,
低層氣流加速在台灣西北沿岸往南海,高層氣流加速在台灣北部往東海,
秋颱扮演的角色就是打水泵,由太平洋高壓導引進來台灣。
成就了"秋颱的外圍環流與冷高壓的類東北季風共伴"
而
這次諾盧颱風徹底發揮了打水幫浦的角色,
儘管距離遠,且風場不大,但同時與"地面場冷高壓"與"高空場太平洋高壓"互動,
再加上,
西風槽的淺化比原先預期來的慢些,冷高壓較晚東移出海,
成就了這次"類共伴"或是根本稱"準共伴"
說到底就是秋季的輻合秀,
類東北季風的冷性東北風輻合的重雨區往宜蘭山區落,
這種就就秋季最強降雨的特性-神鬼莫測。
不過,好在的是
模式顯示,
北方冷高壓入夜後東移,雖然慢了點,但東北風變東北東風
此後,宜蘭南方山區的豪雨才會逐漸趨緩。
結論:
如果是夏天,太平洋高壓在高空地面都有能力阻擋"颱風與冬季系統互動"
但到了秋天,高空有漏洞,或是地面場冷高壓(類)東北季風與秋颱輻合,
都要留意是否為秋颱共伴效應的大氣形勢發展囉。
(快速說說囉)
--
地面場就是冷高壓、颱風、太平洋高壓。
目前地面場來看,
台灣南方的諾盧颱風正通過呂宋島,
台灣北方從東北亞、東亞沿海到東亞內陸整片都是冷高壓區,
再從高空場來看,
西風槽位於長江流域,太平洋高壓單體中心位於日本南方,
這種配置可以說是準共伴效應的配置,
差別在於冷高壓弱了些,西風槽和太平洋高壓稍微偏北了些,
因此,不見傳統共伴鋒面的出現,反而比較像是一般的輻合/類共伴。
事實上,
預報一開始也認為高空配置偏北,即使出現類共伴時間很短,
然而,一切就是始於諾盧颱風的快速發展。
諾盧颱風的快速發展,帶上來大量水氣並加速太平洋高壓的偏東氣流,
同時,也與冷高壓南下的類東北季風輻合在西側外圍環流,
因此,
低層氣流加速在台灣西北沿岸往南海,高層氣流加速在台灣北部往東海,
秋颱扮演的角色就是打水泵,由太平洋高壓導引進來台灣。
成就了"秋颱的外圍環流與冷高壓的類東北季風共伴"
而
這次諾盧颱風徹底發揮了打水幫浦的角色,
儘管距離遠,且風場不大,但同時與"地面場冷高壓"與"高空場太平洋高壓"互動,
再加上,
西風槽的淺化比原先預期來的慢些,冷高壓較晚東移出海,
成就了這次"類共伴"或是根本稱"準共伴"
說到底就是秋季的輻合秀,
類東北季風的冷性東北風輻合的重雨區往宜蘭山區落,
這種就就秋季最強降雨的特性-神鬼莫測。
不過,好在的是
模式顯示,
北方冷高壓入夜後東移,雖然慢了點,但東北風變東北東風
此後,宜蘭南方山區的豪雨才會逐漸趨緩。
結論:
如果是夏天,太平洋高壓在高空地面都有能力阻擋"颱風與冬季系統互動"
但到了秋天,高空有漏洞,或是地面場冷高壓(類)東北季風與秋颱輻合,
都要留意是否為秋颱共伴效應的大氣形勢發展囉。
(快速說說囉)
--
Tags:
颱風
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