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Back基隆強降雨釀災遭疑無預警 氣象署澄清:已發布多次豪大雨特報
基隆強降雨釀災遭疑無預警 氣象署澄清:已發布多次豪大雨特報
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自由时报1 hour agoEnvironment3 min readChina

基隆強降雨釀災遭疑無預警 氣象署澄清:已發布多次豪大雨特報

針對外界質疑基隆淹水缺乏預警,中央氣象署澄清已發布8報豪大雨特報及5次大雷雨即時訊息,並強調強降雨預測難度。

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針對基隆4日強降雨引發淹水災情,外界質疑預警不足。中央氣象署澄清,當日已發布8報豪大雨特報及5次大雷雨即時訊息,並透過細胞廣播提醒。署方強調,短延時強降雨生成快速,預測難度高,預警需依即時觀測滾動調整。

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Why It Matters

9月4日基隆地區因強降雨導致市區淹水,引發外界對於氣象預警機制是否及時的討論。

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昨天(4日)基隆強降雨,導致市區大淹水釀災,外界質疑沒有相關預警。中央氣象署今晚澄清,昨天已針對基隆地區共發布8報豪大雨特報、5次大雷雨即時訊息,其中2次透過災防告警細胞廣播(CBS)提醒民眾,且昨天的強降雨原因很難提前預測。

氣象署氣象預報中心主任黃椿喜表示,昨天同時受到科羅旺颱風的外圍雲系、低壓帶,以及南風和北風輻合,剛好導致在基隆北海岸交會,所以有強降雨,「這類天氣事件發生時,很難提前預知強度,只能在發生時靠雷達監測和雨量站統計,及時提供訊息」。

氣象署晚間說明,目前部分資訊對於氣象署預警發布時序及通報情形的解讀,與實際作業紀錄有所落差,因此再做說明,氣象署自降雨發生前就持續提供相關風險提醒,並隨對流系統發展及雨勢變化,滾動調整警戒層級。

9月4日,氣象署針對基隆地區共發布8報豪大雨特報、5次大雷雨即時訊息,其中2次並透過災防告警細胞廣播(CBS)提醒民眾,相關資訊也同步透過既有機制傳遞地方政府及防災單位。

氣象署說明,事發前一天(9月3日),都有不斷提醒,隔天(4日)北部及東北部地區須注意大雨。當4日清晨對流系統逐漸接近北部陸地後,氣象署在清晨6時25分發布大雨特報,6時57分發布大雷雨即時訊息;隨後因雨勢快速增強及累積雨量上升,8時30分進一步發布豪雨特報,將基隆北海岸列入豪雨影響範圍。

氣象署表示,發布時序可清楚看出,氣象預警發布係依據當時雷達、地面觀測及最新預報資料,隨天氣系統發展持續更新預警資訊及提高警戒層級,相關氣象情資亦透過官網、簡訊、傳真及既有地方通報管道同步傳遞。

基隆市政府於豪雨特報發布後,曾主動詢問降雨系統可能持續時間,氣象署也依當時對流持續旺盛、仍有新對流生成的情況,研判雨勢可能持續至晚間,並提醒地方政府持續掌握後續雨勢發展及做好相關災害防範。

氣象署進一步說明,短延時強降雨具有對流尺度小、生成及發展快速,且容易受到複雜地形影響等特性,降雨強度及影響範圍可能在短時間內快速變化,因此可供預警及防災應變的時間相對有限。

氣象署說明,氣象預警必須依據當時可取得的即時觀測及預報資料滾動研判,因此對預警成效的檢視,宜回到事件當時的氣象條件、可掌握資訊及實際警示發布時序進行完整評估,無法依事後雨勢倒推當下預報,更不能將短時間快速變化的天氣系統,簡化為「有沒有預警」。

Open Questions

  • 基隆市區具體的淹水災情規模為何?
  • 地方政府防災單位的實際應變作為為何?

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