季風環流圈~2016/08/19 - 颱風討論
By Erin
at 2016-08-19T05:58
at 2016-08-19T05:58
Table of Contents
過去這兩天台灣的午後雷雨都相當明顯,除了午後雷雨之外,
還有不少地方都有非午後的降雨發生,
最主要是台灣正好位於西側季風槽帶來的偏南風跟東側季風環流圈帶來的偏北風交會處,
http://imgur.com/7zy4674
因此大氣狀態比較不穩定,除了午後對流發展旺盛之外,
其他時間在台灣周圍也有不少中小尺度對流活動,移入陸地就會帶來降雨的情況。
預估今天周五(19日)偏南風水氣仍較多,加上氣流交會的配置不變,
因此仍要注意中小尺度對流帶來的降雨,特別是中南部、恆春半島等區域,
中午過後從山區發展起來的熱對流仍然會很旺盛,
因此外出記得攜帶雨具,有活動安排的話也要小心安全。
周末假期(20~21日)仍有午後對流發展降雨機會,
不過隨著西邊的電母颱風遠離,偏南風水氣會逐漸減少,
剩下東側季風環流圈帶來的大範圍偏北到東北風,天氣狀態相對會穩定一些,
週六的午後對流範圍將縮減到山區,仍要留意局部大雨出現的可能性,
週日的對流發展會更弱,範圍也會更小一些,仍是以山區為主。
東邊這個季風環流圈中目前有3個熱帶性低氣壓,
未來大致會圍繞著環流圈旋轉,動態的變化很大,
http://imgur.com/sJxkUR3
通常這種繞著環流圈旋轉的系統,不是被拋出去,就是有趨向環流圈中心的趨勢,
因此環流圈中心的移動方向很重要,預期未來整個環流圈有往西移動的情況,
下周的天氣,特別是後期的天氣好壞就要密切觀察這些系統就究竟會怎麼轉,
跟環流圈之間的互動也非常有意思,值得好好觀察。
以上簡單供參考囉~
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