天氣小觀:未來一周~新颱風
天氣小觀:未來一周~新颱風
目前位於關島東方的熱帶太平洋上,
已經出現熱帶擾動在旋轉,
初始的氣旋擾動出現,
未來一周預報看好會發展成新的颱風。
不過這次不像蘇迪勒颱風由太平洋高壓主導的穩定路徑。
這次路徑因為北方大氣系統加入戰局,路徑上變數變大了,
自冬季系統的覺醒,重新震撼了夏季系統,
北極渦旋的攻擊使南亞高壓往南退讓一些,讓西風噴流壓到北緯40度以下。
西風槽的活動,又連帶壓迫太平洋高壓往南退讓一些,讓出日本一帶。
未來一周,太平洋高壓是否能如期重回日本,
勢必與即將來到的東北高空冷渦旋一戰,
以季節來看,太平洋高壓應該佔上風,因此先前模式預報,一周後期,
太平洋高壓重新掌控日本,當然就迫使新颱風偏西移動趨向台灣。
但新的模式預報,即便後期高壓脊重新往日本伸展,
但在東北高空冷渦旋的壓迫下,無法壓制颱風偏西,
因此颱風也有可能偏北趨向東海。
以上還不包括颱風本身發展的問題。
因為關島東方的熱帶太平洋上,將會有兩個主要氣旋擾動出現,
而究竟是東邊擾動發展快,或是西邊擾動發展快,預報都有分歧。
若東邊擾動發展快,發展為颱風強度和範圍大,
將影響太平洋高壓勢力的分布,加強高壓南側的偏東風,
連帶使西邊的擾動偏西移動,趨向台灣東南方海面。
若西邊的擾動發展快,則形成颱風後先由太平洋高壓導引偏西,
後期則視太平洋高壓勢力與是否能壓制颱風偏西,決定路徑偏北或偏西。
而東邊的擾動則自顧發展。
因此,整體來看,未來颱風的路徑算蠻複雜的,還需要觀察。
(以上供參囉)
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