天氣小觀:年假結束,夏季系統甦醒,出現春雨鋒 - 颱風討論
By Hedy
at 2019-02-10T19:58
at 2019-02-10T19:58
Table of Contents
天氣小觀:年假結束,夏季系統甦醒,後期出現春雨鋒面
年假結束,這幾天中南部和北東部地區可說兩樣情,
原因當然是地面東北季風影響,
由於地面冷高壓不強,
後一波路徑較短的東北季風 與 前一波路徑較長的東北季風
兩者輻合在東北部外海和東部外海,
後一波較冷東北季風帶入冷空氣在北部,
北部陰天,基隆北海岸有雨,
東部外海則是輻合甚至小氣旋的影響,花蓮也陰天,
相對於南方,
東南部則因為地形凹陷,離東部外海輻合較遠,
中部和南部更因為背風面溫度和降雨都少受影響,
除了先前鋒面南下不穩定外。
模式預報,未來一週,
夏季系統甦醒,南亞增溫,高空出現反氣旋,
這反氣旋當然不是南亞高壓,
而因地面增溫後的700百帕的高空輻散,
反氣旋東側的西風南支槽對應轉為活躍,
槽前的西南風急流衝向華南地區,
預報後期春雨鋒面出現,
且華南地區可能出現強對流伴隨春雷大作,
準備面對又開始的過渡季節了,
冷暖又要開戰,
後期地面變性高壓的偏南風和東北季風輻合,
儘管有氣旋發展,但因為春季不像秋季,春季的海溫偏低,
輻合的氣旋主要還是由高空大氣推動的斜壓機制較容易發展。
春季大氣精彩秀看高空 (秋季大氣精彩秀看地面)
由於春季高空變幻快速,華南雲雨帶出現,
因此,接下來就看華南雲雨帶了。
在此之前,冬季系統不南衝,台灣依舊不冷偏暖,尤其中南部。
(以上供參囉)
--
年假結束,這幾天中南部和北東部地區可說兩樣情,
原因當然是地面東北季風影響,
由於地面冷高壓不強,
後一波路徑較短的東北季風 與 前一波路徑較長的東北季風
兩者輻合在東北部外海和東部外海,
後一波較冷東北季風帶入冷空氣在北部,
北部陰天,基隆北海岸有雨,
東部外海則是輻合甚至小氣旋的影響,花蓮也陰天,
相對於南方,
東南部則因為地形凹陷,離東部外海輻合較遠,
中部和南部更因為背風面溫度和降雨都少受影響,
除了先前鋒面南下不穩定外。
模式預報,未來一週,
夏季系統甦醒,南亞增溫,高空出現反氣旋,
這反氣旋當然不是南亞高壓,
而因地面增溫後的700百帕的高空輻散,
反氣旋東側的西風南支槽對應轉為活躍,
槽前的西南風急流衝向華南地區,
預報後期春雨鋒面出現,
且華南地區可能出現強對流伴隨春雷大作,
準備面對又開始的過渡季節了,
冷暖又要開戰,
後期地面變性高壓的偏南風和東北季風輻合,
儘管有氣旋發展,但因為春季不像秋季,春季的海溫偏低,
輻合的氣旋主要還是由高空大氣推動的斜壓機制較容易發展。
春季大氣精彩秀看高空 (秋季大氣精彩秀看地面)
由於春季高空變幻快速,華南雲雨帶出現,
因此,接下來就看華南雲雨帶了。
在此之前,冬季系統不南衝,台灣依舊不冷偏暖,尤其中南部。
(以上供參囉)
--
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