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Back薔琵颱風受6因素催出風速 氣象專家提醒「真正強風還沒來」
薔琵颱風受6因素催出風速 氣象專家提醒「真正強風還沒來」
Urgent
自由时报2 hours agoEnvironment3 min readChinaView translation

薔琵颱風受6因素催出風速 氣象專家提醒「真正強風還沒來」

颱風薔琵強度為中颱上限,暴風圈籠罩全台帶來強風。氣象署持續發布17縣市陸上強風警報,專家提醒最強風速還沒來,民眾須嚴加戒備。

Quick Look

中颱薔琵暴風圈籠罩全台,中央氣象署預估其將在外海打轉後北走。專家分析其路徑不規則及「風大於雨」的6大關鍵因素,並對17縣市發布陸上強風警報,提醒最強風速將落在今晚至明晨。

AI-generated summary

Why It Matters

颱風薔琵的暴風圈籠罩全台,中央氣象署針對全台17縣市發布陸上強風警報。

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颱風薔琵的暴風圈籠罩全台,強度為中颱上限,7級暴風圈320公里籠罩全台,帶來強風,民眾須留意。

颱風薔琵的暴風圈籠罩全台,其中心今(23日)下午在宜蘭外海東南東方140公里,中央氣象署預估其將在外海打轉一下後再往北走;針對其路徑,專家分析,主要是受到3個環境條件致其短暫不規則運動;而薔琵帶來的風勢強過雨勢,則是受到地形、氣壓、狹管效應等6個因素催出風勢,提醒真正強風還沒來,民眾需多加小心。

針對薔琵未來路徑變化,台灣大學大氣科學博士林得恩表示,薔琵目前移動速度從原先時速20公里慢慢減速到9公里,但並非強度減弱,而是3個主要環境條件改變所致,第一是控制颱風的「環境駛流場」引導氣流變弱、第二是薔琵將從北北西方向往北轉使其減速,第三是碰到台灣地形干擾颱風低層環流;此3因素都讓薔琵速度減慢,導致短暫的不規則運動。不過一旦完成北轉、繞過地形,重新接上環境駛流場,薔琵就會加速北行,至少時速15公里。

薔琵目前帶來的風勢大過雨勢,林得恩分析,主要也有6個因素影響,包含:1、薔琵原先是從強烈颱風降為中度颱風,但目前仍是中颱上限,帶來風浪較大;2、薔琵的7級暴風半徑非常大(320公里),籠罩全台也帶來更多的影響範圍;3、薔琵逼近台灣時,跟東北風雖無共伴效應,但有共同作用影響,其北側支流與東北風加成容易帶來局部陣風;4、薔琵受北方冷高壓的氣壓梯度變大,也易造成強風;5、薔琵強風帶碰到台灣地形也有機會受加成效應;6、薔琵的外圍環流受到台灣中央山脈與中國福建武夷山的影響,在台灣海峽形成「狹管效應」,氣流從寬廣的地方進到狹窄管道,產生的風速也會增快增強。

林得恩提醒,薔琵帶來真正的強風「還沒來!」,最強風速預估落在今天晚上到明天清晨,尤其是颱風眼牆的環流,民眾需多加小心。氣象署下午4點持續針對基隆市、新北市、桃園市、新竹市、苗栗縣、台中市、彰化縣、雲林縣、嘉義縣、台南市、高雄市、屏東縣、台東縣、花蓮縣、宜蘭縣、澎湖縣、連江縣等共17縣市發布陸上強風警報,恐吹平均風9級以上或陣風11級以上。

What to Watch

AI outlook — possibilities, not facts

  • 最強風速將落在今天晚上到明天清晨

    Likely · Within hours

Open Questions

  • 薔琵未來北上的確切時間為何?
  • 各地實際測得的最大風速為多少?

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