天氣速觀:1054百帕強烈蒙古冷高壓開始南下 - 颱風討論
By Daph Bay
at 2021-11-21T08:43
at 2021-11-21T08:43
Table of Contents
冷空氣堆積到1050百帕以上的冷高壓至少都有低於零下20度的強烈威力了,
這給了南下減弱的空間,即便到達南方依舊有冷氣團威力。
目前1054百帕強烈蒙古冷高壓已開始南下,
首當其衝內蒙古區,再來由北往南;
內蒙古呼和浩特上午降到零下7度
北京下午受影響,預報由7度往0度接近,
上海晚上受影響,預報由14度降到個位數,
香港要等到明天下半天才會受影響。
而台灣,由於來台冷空氣挑戰冷氣團走海路,少了地形阻擋,
因此今天深夜過後~明天凌晨冷空氣前緣就會抵達,北部東北部開始降雨,
明天一早開始跳水降溫,明天中午冷空氣主力就會抵達,
再來就是看是否達標11月第二波冷氣團了。
現在才11月下旬,卻感覺好像12月的冷氣團季節。
明起,強烈東北季風下北部東北部地形雨明顯,一連冷到週三;
在這季節,蒙古-東亞內陸與南海、西太平洋形成冷暖對比,
蒙古-東亞內陸由蒙古冷高壓控場,
南海-菲東太平洋由副熱帶高壓盤踞,
因此,
西風南支槽在印度半島東北側受阻無法東移,
印度洋暖濕水氣無法帶進東亞,東亞內陸高空乾燥,
當西風槽轉直時,冷氣團/冷空氣南下,
蒙古-東亞內陸(冷氣團)與南海、西太平洋(暖氣團)的冷暖交會,
冷暖交會形成鋒面,高空出現噴流,
華南一帶的槽前噴流較為平直,
而,東海到日本的槽前噴流為"西南風"噴流,發展最強烈,
因此,
這季節冷鋒通過台灣,鋒面降雨往往只在北部東北部。(但真正多雨還是地形雨)
等到,
春季南支槽活躍後,鋒面通過台灣降雨就比較多為中部以北,變成全台降雨。
(快速說說囉)
--
這給了南下減弱的空間,即便到達南方依舊有冷氣團威力。
目前1054百帕強烈蒙古冷高壓已開始南下,
首當其衝內蒙古區,再來由北往南;
內蒙古呼和浩特上午降到零下7度
北京下午受影響,預報由7度往0度接近,
上海晚上受影響,預報由14度降到個位數,
香港要等到明天下半天才會受影響。
而台灣,由於來台冷空氣挑戰冷氣團走海路,少了地形阻擋,
因此今天深夜過後~明天凌晨冷空氣前緣就會抵達,北部東北部開始降雨,
明天一早開始跳水降溫,明天中午冷空氣主力就會抵達,
再來就是看是否達標11月第二波冷氣團了。
現在才11月下旬,卻感覺好像12月的冷氣團季節。
明起,強烈東北季風下北部東北部地形雨明顯,一連冷到週三;
在這季節,蒙古-東亞內陸與南海、西太平洋形成冷暖對比,
蒙古-東亞內陸由蒙古冷高壓控場,
南海-菲東太平洋由副熱帶高壓盤踞,
因此,
西風南支槽在印度半島東北側受阻無法東移,
印度洋暖濕水氣無法帶進東亞,東亞內陸高空乾燥,
當西風槽轉直時,冷氣團/冷空氣南下,
蒙古-東亞內陸(冷氣團)與南海、西太平洋(暖氣團)的冷暖交會,
冷暖交會形成鋒面,高空出現噴流,
華南一帶的槽前噴流較為平直,
而,東海到日本的槽前噴流為"西南風"噴流,發展最強烈,
因此,
這季節冷鋒通過台灣,鋒面降雨往往只在北部東北部。(但真正多雨還是地形雨)
等到,
春季南支槽活躍後,鋒面通過台灣降雨就比較多為中部以北,變成全台降雨。
(快速說說囉)
--
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