海棠接力襲台 高雄卻出現大太陽的兩大原 - 高雄
By Michael
at 2017-07-30T12:24
at 2017-07-30T12:24
Table of Contents
海棠接力襲台 高雄卻出現大太陽的兩大原因
尼莎颱風撲台,北台灣昨晚風強雨大,尼莎遠離,今天早上風雨停歇,預估海棠傍晚6點
登陸南台灣,但高雄早上卻出現大太陽,氣象預報失準嗎?氣象局表示是因為2颱風間的
空檔,臉書粉絲專頁《天氣即時預報》也點出兩大因素影響,但「中午後」,從南部開始
一路往北,就要特別注意。
全台今天放颱風假,卻有不少地區風雨都已停歇,被視為海棠颱風登陸地點的南台灣,高
雄早上還出現大太陽,氣象局提醒是因為目前處在兩個颱風空檔時間。
臉書粉絲專頁《天氣即時預報》點出感受不到風雨的兩大因素,分別為「尼莎登陸點,顯
著北調」、「海棠迅速接近,雙颱出現風力互相抵銷區域」。
尼莎預估登陸地點變變變,原本預估在台東登陸,但最後大幅北移在宜蘭登陸,南部不在
暴風圈內,風雨自然比預估小的很多,反而是北台灣昨天晚上風強雨大。
另外就是因為雙颱間互相牽引,颱風出海一般會「轉回南」,也就是「西南風灌入西部平
原」,但因為海棠颱風迅速接近,除了西南風被海棠導引走向東部海面外,雙颱中間區域
是「風力互相抵銷區域」,此區正好涵蓋南部,且風向偏東南風,南部仍在「背風面」,
天氣很好。
本島各地大約還有6個小時的空檔,這段時間風雨不會太大,但氣象局已經預估海棠暴風
圈在下午觸陸,大約6點在台南、高雄登陸,中午過後,風雨就會從南部一路往北。
天氣職人吳聖宇也提醒,海棠颱風南側拖著旺盛的西南氣流水氣,預估今晚颱風北上後,
西南氣流水氣也將會整個北上影響台灣,提醒提醒中南部、東南部的地區今晚到明天可能
出現的強降雨情況,北台灣受影響會比較小。
聯合新聞網 綜合報導
https://udn.com/news/story/11364/2612830
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