天氣小觀:西伯利亞凍氣沒有最狂,只有更狂
天氣小觀:邁向零下30度,西伯利亞凍氣沒有最狂,只有更狂
模式預報,受歐洲阻塞高壓入侵北極,北極高空大氣場持續呈現"工"型,
北極氣團持續流向北亞與北美大陸,尤其盤踞在西伯利亞高空的北極渦旋,
讓今年的西伯利亞凍氣沒有極限。
模式預報,隨著歐洲阻塞高壓崩潰前,又與新的北大西洋暖脊結合再生,
未來一周乃至於一周過後,西伯利亞地面凍氣開始邁向零下30度。
預報一周的高空形勢來看,西伯利亞伸出一大橫槽,
後期受到暖脊逼近中亞,中亞的溫度槽落後高度槽,
這時冷平流順著槽後氣流往南方送,有利於槽加深南壓。
一周後期,中亞西風槽就有加深的現象,帶動冷氣團向南方侵襲。
中亞西風帶的更下游就是東亞,中亞西風槽成形後,
往往也牽動著東亞西風帶的波動,
畢竟西風帶是一環扣著一環的連結全球,
藉西風槽脊的波動達到南北氣流交換,
但問題是,現在的西伯利亞凍氣無極限,
東亞氣團若要和它交換,那可是不得了。
因此,後續要再觀察。
而這波冷空氣影響過後,一周後期,還有一小波比較弱的冷空氣補充,
但降溫不大,以北部/東北部降雨為主,之後地面高壓東移,風向漸漸轉為偏東風。
因此,未來一周來看,仍以正常的淺秋~深秋的天氣為主。(冷也不會太冷,熱也不會太熱)
(簡單說說,以上供參囉)
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※ 編輯: daron (123.192.194.253), 11/09/2016 23:07:06
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