天氣小觀:北極渦旋先退,冬季系統南侵力道大減 - 颱風討論
By Noah
at 2023-03-10T19:57
at 2023-03-10T19:57
Table of Contents
最新模式預報與先前有了很大不一樣,
主要原先模式認為北極渦旋進入西伯利亞配合中層西風大槽轉直,
因此原先看好冬季系統冷氣團或強冷氣團南下;
不過,
目前模式認為北極渦旋會先退回北極,
這將導致冬季系統西風大槽轉直的南侵力道不夠,
甚至槽後的冷空氣受制於南方地形與日照暖勢力,原先的大直槽裂成短槽,
如此一來,
就是一般冷空氣南下台灣了。
未來一週模式顯示,週日晚起蒙古冷高壓南下,東北季風開始增強,
北部與東北部鋒面通過下雨,
不過由於初春冷高壓移動速度開始加快,因此南下到出海時間也很快,
週二冷高壓就完全出海,週三冷高壓已經減弱變性,台灣溫度回升。
台灣目前最關心的雨水,
南方大氣環境來看,一週尾聲,
西風南支槽少了北方大陸冷高壓的抑制後,開始趨向活躍,
中低空西南風急流出現,把印度洋暖濕水氣帶入華南地區出現降雨,
不過,南支槽往東移的過程中會北縮減化,
原因當然是一週過後,第二波冷高壓會逐漸南下,抑制了南支槽,
因此華南雲雨帶的鋒面水氣往台灣的過程中,就減弱溜,
整體來看台灣降雨還是要再等等。
北部東北部例外,甚至週日晚北宜鋒面掃過可能有較大雨勢溜。
春天多鋒面雨,夏天多對流雨,秋天多氣旋雨,冬天多地形雨。
(以上供參溜)
--
主要原先模式認為北極渦旋進入西伯利亞配合中層西風大槽轉直,
因此原先看好冬季系統冷氣團或強冷氣團南下;
不過,
目前模式認為北極渦旋會先退回北極,
這將導致冬季系統西風大槽轉直的南侵力道不夠,
甚至槽後的冷空氣受制於南方地形與日照暖勢力,原先的大直槽裂成短槽,
如此一來,
就是一般冷空氣南下台灣了。
未來一週模式顯示,週日晚起蒙古冷高壓南下,東北季風開始增強,
北部與東北部鋒面通過下雨,
不過由於初春冷高壓移動速度開始加快,因此南下到出海時間也很快,
週二冷高壓就完全出海,週三冷高壓已經減弱變性,台灣溫度回升。
台灣目前最關心的雨水,
南方大氣環境來看,一週尾聲,
西風南支槽少了北方大陸冷高壓的抑制後,開始趨向活躍,
中低空西南風急流出現,把印度洋暖濕水氣帶入華南地區出現降雨,
不過,南支槽往東移的過程中會北縮減化,
原因當然是一週過後,第二波冷高壓會逐漸南下,抑制了南支槽,
因此華南雲雨帶的鋒面水氣往台灣的過程中,就減弱溜,
整體來看台灣降雨還是要再等等。
北部東北部例外,甚至週日晚北宜鋒面掃過可能有較大雨勢溜。
春天多鋒面雨,夏天多對流雨,秋天多氣旋雨,冬天多地形雨。
(以上供參溜)
--
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