微妙的地形作用~2016/09/17
昨晚到今天清晨這段期間,馬勒卡颱風的環流跟台灣地形開始有了微妙的交互作用,
颱風最外圍的風場逐漸繞過地形跑到台灣海峽這一側,有偏北到西北風的分量出來,
隱約可以從觀測風向看出背風渦漩存在,
使得西半部的陸地上有對流生長,甚至在阿里山區還發生頗強的降雨,
反而是原本預測應該降雨頗大的北部、東北部雨勢不如預期,
主要是颱風的核心環流仍在海上,沒有直接影響陸地的關係。
因為西部測站實際觀測的風速並不強,看起來雖然颱風環流跟台灣地形有交互作用,
但是效果沒有很明顯,因此預期颱風大致就是往偏北略偏北北西的方向移動,
等到中午過後颱風中心通過台北正東方之後,
就會逐漸脫離地形的拉扯,回歸到正常駛流的方向往北北東轉東北移動。
還好地形的作用沒有很強,萬一被地形拉扯往東北角靠近的話,
風雨的就會變得明顯很多,
在颱風中心附近的嶼那國島實際觀測到平均風15級,陣風17級,
颱風中心沒有真的靠近陸地,算是很幸運的情況。
預期等到颱風更往北一點,西北風還是會進來,
雪山山脈沿線的新北、桃園、新竹、苗栗甚至到台中
要留意後續豪大雨情況以及較強的陣風。
中部山區這一塊強降雨的區域還會持續幾個小時,雨量仍會再累積,
仍要持續注意降雨的狀況。
以上簡單供參考,繼續值班~
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