天氣小觀:東北季風漸弱,後期觀察颱風 - 颱風討論
By Charlie
at 2021-04-09T10:15
at 2021-04-09T10:15
Table of Contents
昨天南壓的西風槽比預期弱些,因此低空噴流主要位於東海,
槽後的地面冷空氣倒是蠻給力的,清晨北部16~17度。
看來有了上週前鋒冷空氣打底還是有差,
明天起東北亞的冷高壓出海開始變性,台灣轉為偏東風水氣進來,
因此週日到週一主要降雨轉到東部,不過很快的,週三又一波鋒面南下。
模式預報,
週二蒙古冷高壓南下,週三鋒面斷成兩截,
前段通過台灣北部,東北季風的冷鋒降雨,
後段停留在華南成為華南滯留鋒。
因此,未來一週代表著兩件重要大事:
1.(正統)東北季風準備退場
蒙古冷高壓週二南下,週三才有東北季風吹到台灣北部,
這表示蒙古冷高壓已逐漸無法影響台灣;
一般,
4月下旬,西伯利亞/蒙古地面冷高壓吹出的正統東北季風已影響不到台灣,
這是由於青藏高原4月轉變為熱源,到了4月下旬,連蒙古高原都增溫了,
冷氣團只好轉往北亞大陸堆積冷高壓,
而台灣已不受極地冷氣團影響了(除非北極大震盪)。
因此,
4月下旬影響台灣的主要是東亞殘餘冷空氣重新堆積的東北風。
目前漸漸步入4月中,繼青藏高原之後,蒙古高原也準備要增溫了,
冷氣團進入蒙古不再享有優勢,反而逐漸處於地緣劣勢,
因此,
東北季風對台灣影響越來越弱,一旦蒙古高原增溫不利冷高壓發展,
東亞就只剩各自為政的殘餘冷空氣,等著南海西南季風爆發來清除了。
而,
對台灣來說,(正統)東北季風當然也就掰掰了。(下次再見要好幾個月以後了)
而今年蒙古冷高壓(正統)--東北季風退場的時間點,沒意外應該會落於4月中旬。
2. 冷暖大戰更激烈
南支槽重新發揮影響力,槽前大氣中低層的低空西風噴流進入華南,地面則是冷暖氣流交會,
於是一週後期華南滯留鋒的出現代表著冷暖大戰更加激烈,讓人期待之後的梅雨壓軸大秀。
模式一週尾聲,冷暖交會區也逐漸往東擴及,
如此一來照理說,
台灣也要落入滯留鋒區。
偏偏,偏偏,南方有颱風出現。
滯留鋒是大氣高空秀,颱風是大氣地面秀;
春季是大氣高空秀的季節,偏偏颱風要玩大氣地面秀,
那模式就不看好滯留鋒出現在台灣上空了。
可是,
颱風對風迷來說,一直都是最重要的那一塊;
在這情感的春季,風颱你比我想的閣較偉大...
只是台灣現在需要的是滯留鋒QQ
(以上供參囉)
--
槽後的地面冷空氣倒是蠻給力的,清晨北部16~17度。
看來有了上週前鋒冷空氣打底還是有差,
明天起東北亞的冷高壓出海開始變性,台灣轉為偏東風水氣進來,
因此週日到週一主要降雨轉到東部,不過很快的,週三又一波鋒面南下。
模式預報,
週二蒙古冷高壓南下,週三鋒面斷成兩截,
前段通過台灣北部,東北季風的冷鋒降雨,
後段停留在華南成為華南滯留鋒。
因此,未來一週代表著兩件重要大事:
1.(正統)東北季風準備退場
蒙古冷高壓週二南下,週三才有東北季風吹到台灣北部,
這表示蒙古冷高壓已逐漸無法影響台灣;
一般,
4月下旬,西伯利亞/蒙古地面冷高壓吹出的正統東北季風已影響不到台灣,
這是由於青藏高原4月轉變為熱源,到了4月下旬,連蒙古高原都增溫了,
冷氣團只好轉往北亞大陸堆積冷高壓,
而台灣已不受極地冷氣團影響了(除非北極大震盪)。
因此,
4月下旬影響台灣的主要是東亞殘餘冷空氣重新堆積的東北風。
目前漸漸步入4月中,繼青藏高原之後,蒙古高原也準備要增溫了,
冷氣團進入蒙古不再享有優勢,反而逐漸處於地緣劣勢,
因此,
東北季風對台灣影響越來越弱,一旦蒙古高原增溫不利冷高壓發展,
東亞就只剩各自為政的殘餘冷空氣,等著南海西南季風爆發來清除了。
而,
對台灣來說,(正統)東北季風當然也就掰掰了。(下次再見要好幾個月以後了)
而今年蒙古冷高壓(正統)--東北季風退場的時間點,沒意外應該會落於4月中旬。
2. 冷暖大戰更激烈
南支槽重新發揮影響力,槽前大氣中低層的低空西風噴流進入華南,地面則是冷暖氣流交會,
於是一週後期華南滯留鋒的出現代表著冷暖大戰更加激烈,讓人期待之後的梅雨壓軸大秀。
模式一週尾聲,冷暖交會區也逐漸往東擴及,
如此一來照理說,
台灣也要落入滯留鋒區。
偏偏,偏偏,南方有颱風出現。
滯留鋒是大氣高空秀,颱風是大氣地面秀;
春季是大氣高空秀的季節,偏偏颱風要玩大氣地面秀,
那模式就不看好滯留鋒出現在台灣上空了。
可是,
颱風對風迷來說,一直都是最重要的那一塊;
在這情感的春季,風颱你比我想的閣較偉大...
只是台灣現在需要的是滯留鋒QQ
(以上供參囉)
--
Tags:
颱風
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at 2021-03-22T08:58
at 2021-03-22T08:58