脫離鞍形氣場 天秤往西加速 - 颱風討論
By Damian
at 2012-08-23T16:30
at 2012-08-23T16:30
Table of Contents
http://www.cna.com.tw/News/FirstNews/201208230035.aspx
（中央社記者林紳旭台北23日電）中央氣象局預報中心主任鄭明典表示，中度颱風天秤今
天下午脫離束縛多時的「鞍形氣場」，逐漸加速，東半部將進入暴風圈。
鄭明典指出，天秤颱風移動緩慢，並不是受到後方另一個中度颱風布拉萬接近所造成的藤
原效應而影響，根據氣象局資料，天秤颱風是陷入東西都有高壓、南北都有低壓的「鞍形
氣場」才會停滯，在台東外海停留，強度略增後，已往西加速移動。
鄭明典說，天秤如果要和布拉萬發生藤原效應，兩者的中心要接近到1000到1200公里以內
，但目前兩者的中心相距仍有1300公里以上。
中央氣象局指出，下午2時天秤颱風的中心位置在台東的東方210公里海面上，以時速9公
里往西進行，7級風半徑180公里，10級風半徑50公里，近中心最大風速為每秒43公尺，瞬
間最大陣風為每秒53公尺。
氣象局預估，明天下午2時，天秤颱風的中心將移到台東的西北西方20公里處。
海上警戒區域包括台灣東北部、東南部、巴士海峽和台灣海峽的海面，作業船隻應嚴加戒
備；陸上警戒區域東半部各縣市及綠島、蘭嶼，西半部為新竹以南各縣市。
在氣溫方面，金門在今天出現最高溫達攝氏36.9度、台中35.1度、高雄34.1度。
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