天氣小觀：南支槽東移，春雨
天氣小觀：南支槽東移，春雨
目前南支槽正從孟加拉灣北部東移，
即將對上太平洋高壓的西北側，
預報低空西南風噴流將一路吹向華南地區到台灣北部。
同時噴流輻散區，地面誘發明顯得對流雲雨帶，正為春雨鋒面。
一路向東移往台灣，情況好的話，有機會再次出現春雷轟響。
同時間，南亞持續增溫，高空有反氣旋場向北突出，
導致中亞出現的暖脊，對應脊前西伯利亞冷氣團堆積，
地面場出現1040百帕以上的大陸高壓，未來一週後期高壓大舉南下，
這個就是之後的大戲-冬季系統猛烈侵襲。
目前東亞大槽仍靠近東亞，西伯利亞仍有大量的冷氣團，
因此，地面高壓從蒙古或西伯利亞吹出東北季風達台灣。
同時，也由於地面沙塵揚起，空氣中帶有懸浮塵埃，
另外因過渡季節，東北季風南下後減弱，冬季的地形性降雨減少，
因此，往往春天，不只中南部，全台都可能會出現空氣品質較差的現象。
這點與秋天，東亞大槽遠離東亞，地面高壓在東亞外海，
東北風帶來的秋高氣爽不同。
儘管春天往往空氣品質不是很好，
但隨著後天，春雨鋒面到來，屆時又會煥然一新。
至於後天的春雨強度，則要再觀察。
模式預報，南支槽東移後，與太平洋高壓對上後，
太平洋高壓勝出，但自身也受創，因冷暖對峙不算久，
一波春雨過後，天氣會很快回到穩定。
(快速說說，以上供參囉)
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