天氣速觀:西風槽往東偏,冷空氣稍弱些,明早最冷 - 颱風討論
By Andy
at 2021-12-17T21:05
at 2021-12-17T21:05
Table of Contents
冷高壓今起南下,不過,南邊的雷伊颱風與副高場,稍微影響了西風槽南壓較為往東偏。
這當然和雷伊颱風有關係了。
副高場與雷伊颱風的互動,影響了副高場與西風槽的互動:
雷伊颱風西北方的副高場阻絕了雷伊颱風水氣北上華南,
雷伊颱風東北方的副高場引導了雷伊颱風環流水氣北上,
然而,
西風槽南壓時,雷伊颱風通過菲律賓由西北方副高場導引持續往西,
西北方的副高場讓西風槽南壓往東偏,東亞落入槽後乾燥的西北氣流,
對台灣來說,還有副高的偏西風氣流至少沒那麼乾燥。
但整體降雨來說,就很侷限迎風面山區。
溫度上,今晚蒙古冷高壓會南下到華中,明天清晨溫度最冷。
但由於西風槽東偏受副高影響淺縮了一點,槽後的西北氣流變得沒那麼"北",
因此冷空氣強度略減一點,但還是有機會達標冷氣團。
事實上,
雷伊颱風的影響不只如此,孟加拉灣東南側的擾動和雷伊颱風連結成大低壓帶,
夏季系統想比照西南季風復活,但只是南支槽變得活躍,
南支槽前的導引氣流讓雷伊颱風和孟加拉灣東南側未來有機會發展的熱帶氣旋,
兩者都會併入西風帶,水氣往台灣飄來。
但,最先飄來的是外圍環流輻合在呂宋島的水氣北漂,
隨著北方冷高壓出海,雷伊颱風北上,東部海面從東北風轉東南風,
但台灣海峽還是東北風(東亞還有弱冷高壓),
東南風和東北風在台灣附近交會,全台容易降雨。
但雨怎麼下,要再觀察了。
(快速說說囉)
--
這當然和雷伊颱風有關係了。
副高場與雷伊颱風的互動,影響了副高場與西風槽的互動:
雷伊颱風西北方的副高場阻絕了雷伊颱風水氣北上華南,
雷伊颱風東北方的副高場引導了雷伊颱風環流水氣北上,
然而,
西風槽南壓時,雷伊颱風通過菲律賓由西北方副高場導引持續往西,
西北方的副高場讓西風槽南壓往東偏,東亞落入槽後乾燥的西北氣流,
對台灣來說,還有副高的偏西風氣流至少沒那麼乾燥。
但整體降雨來說,就很侷限迎風面山區。
溫度上,今晚蒙古冷高壓會南下到華中,明天清晨溫度最冷。
但由於西風槽東偏受副高影響淺縮了一點,槽後的西北氣流變得沒那麼"北",
因此冷空氣強度略減一點,但還是有機會達標冷氣團。
事實上,
雷伊颱風的影響不只如此,孟加拉灣東南側的擾動和雷伊颱風連結成大低壓帶,
夏季系統想比照西南季風復活,但只是南支槽變得活躍,
南支槽前的導引氣流讓雷伊颱風和孟加拉灣東南側未來有機會發展的熱帶氣旋,
兩者都會併入西風帶,水氣往台灣飄來。
但,最先飄來的是外圍環流輻合在呂宋島的水氣北漂,
隨著北方冷高壓出海,雷伊颱風北上,東部海面從東北風轉東南風,
但台灣海峽還是東北風(東亞還有弱冷高壓),
東南風和東北風在台灣附近交會,全台容易降雨。
但雨怎麼下,要再觀察了。
(快速說說囉)
--
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颱風
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