天氣速觀:罕見三天的炎熱冬陽,後天冷暖開戰 - 颱風討論
By Eartha
at 2018-12-03T17:54
at 2018-12-03T17:54
Table of Contents
一連三天罕見的炎熱冬陽,令人不禁聯想到聖嬰現象的暖冬,
聖嬰現象的發展就是每年聖誕節前後,
正值夏季的東南太平洋海溫升高,
這表示東南太平洋帶來祕魯寒流的東南風減弱,
因此就來看模式,
模式預報未來一周,祕魯寒流的東南風不強,
但並沒有轉風向,因此聖嬰現象可以再觀察。
聖嬰現象一旦發展,
原本赤道東風帶,東太平洋海溫<西太平洋海溫,
變成赤道有西風,東太平洋海溫>西太平洋海溫,
因此,熱帶東太平洋相對為低壓,
而熱帶西太平洋相對為高壓,
對於冬季來說,
剛好副高位於低緯度的熱帶地區,
於是副高往西伸,造成暖冬。
目前副高雖然依舊位處熱帶低緯度,但北邊勢力已盤據台灣,
不過東北亞北方的強大高空冷渦旋已經出現,
模式預報,後天起冷渦旋延伸的西風槽將與副高大戰一週了,
尤其一開始的副高優勢,冷空氣南壓有限,
接著1064百帕冷高壓一口氣南衝,優勢倒向冷渦旋,
最後副高撐著一口氣,中南半島大規模降水釋放潛熱,
副高再接再厲,低空西南風急流出現,東北部甚至全台都要嘩啦啦了。
嘩啦啦之後,再戰嗎?
因為東北亞高空冷渦旋減弱,
這就要看北極渦旋支不支援了,
一週後北極渦旋會到北極,如此一來,正北極震盪不利再戰,
(簡單速觀,以上供參囉)
--
聖嬰現象的發展就是每年聖誕節前後,
正值夏季的東南太平洋海溫升高,
這表示東南太平洋帶來祕魯寒流的東南風減弱,
因此就來看模式,
模式預報未來一周,祕魯寒流的東南風不強,
但並沒有轉風向,因此聖嬰現象可以再觀察。
聖嬰現象一旦發展,
原本赤道東風帶,東太平洋海溫<西太平洋海溫,
變成赤道有西風,東太平洋海溫>西太平洋海溫,
因此,熱帶東太平洋相對為低壓,
而熱帶西太平洋相對為高壓,
對於冬季來說,
剛好副高位於低緯度的熱帶地區,
於是副高往西伸,造成暖冬。
目前副高雖然依舊位處熱帶低緯度,但北邊勢力已盤據台灣,
不過東北亞北方的強大高空冷渦旋已經出現,
模式預報,後天起冷渦旋延伸的西風槽將與副高大戰一週了,
尤其一開始的副高優勢,冷空氣南壓有限,
接著1064百帕冷高壓一口氣南衝,優勢倒向冷渦旋,
最後副高撐著一口氣,中南半島大規模降水釋放潛熱,
副高再接再厲,低空西南風急流出現,東北部甚至全台都要嘩啦啦了。
嘩啦啦之後,再戰嗎?
因為東北亞高空冷渦旋減弱,
這就要看北極渦旋支不支援了,
一週後北極渦旋會到北極,如此一來,正北極震盪不利再戰,
(簡單速觀,以上供參囉)
--
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