天氣小觀:副高使南支槽減弱,未來一周典型冬季
天氣小觀:副高勢力比預期強,西風南支槽減弱中,冷氣團漸進,未來一周典型冬季
經數天前的超級寒流過後,西風南支槽出線,
原先模式預報,強西風南支槽往台灣接近,
槽前地面場甚至都出現西南風始南部出現大雨甚至豪雨。
不過天候瞬變,無人曉得副高的影響力在超級寒流過後,要悄悄發揮。
由於副高比預期來的強,使西風南支槽東移過程中逐漸減弱,
地面也不見西南風出現,南部降雨大為緩和,要等到冷鋒過境才有明顯雨勢。
而冷鋒過境預計明天會過境。
在中亞高空的反氣旋高壓沒有變成阻塞高壓,隨著西風帶逐漸東移,
對應東亞的西風槽往南壓,1048百帕以上的西伯利亞冷高壓明天起移到蒙古,
不過移入蒙古的冷高壓並不會揮大軍南下,這也是天候系統不會從一而終的迷人特性。
明天起的蒙古冷高壓,由於缺乏強烈的西風大槽導引,主要以分裂高壓南下,
因此台灣的天氣在冷鋒通過後屬於漸進式轉冷,漸進影響期間拉長到5天,真是非常的久。
基隆北海岸、東北部與北部再度成為苦主,因為強烈東北季風吹不停,
更苦的是東北季風是從東亞沿海而下,這表示路徑多經過海面,
因此降雨不停,甚至基隆北海岸等迎風面要注意大雨。
尤其金山萬里瑞芳(三和、大坪、大粗坑)看來又要飆雨。基隆當然也好不到哪去。
而也尤於偏北風的東北季風,西部沿海則成為強風下的苦主,
像是苗栗通宵,台中梧棲,彰化鹿港,雲林麥寮看來又要飆風了。
至於東部則以宜蘭蘇花(尤其東澳嶺)多雨,恆春半島落山風,
主要是因為蘇花一帶突出來,東北季風水氣近來且與從宜蘭喇叭狀平原回流的輻和。
東部海岸往內凹,東北季風貼著東部沿海貼到恆春半島形成落山風
總之,未來一周是典型的冬季天氣。
(以上供參囉)
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※ 編輯: daron (223.136.198.120), 01/29/2016 08:38:04
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