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北部連日豪雨！累積雨量「紫到發白」 鄭明典曝原因
發布時間：2025/10/22 09:27:51
更新時間：2025/10/22 09:27:51
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圖、文／周刊王
受東北季風和低氣壓影響，北台灣降下豪大雨，不少地區3天累積雨量圖已呈現「一片紫白」，多處路段積水嚴重，有些大學校園更成了「水樂園」。對此，前氣象局長鄭明典表示，雖然雨勢沒有特別大，但持續降雨仍會帶來可觀的累積雨量。
鄭明典今早（22日）在臉書發文表示，王時鼎老師定義了3類共伴雨型，以第3類雨型和衛星雲圖比對，相似度頗高，示意圖中的颱風往東北移動，那是因為高層使流主導，現在的「小低壓」太弱，低層駛流是往南南西方向。
鄭明典說，目前低壓在台灣東方略偏北海面，氣壓型態會加強台灣北部迎風面的地形雨，雨勢沒有特別大，但持續降雨仍會帶來可觀的累積雨量。
鄭明典指出，試算一下，時雨量15毫米應該不算大，若是持續24小時，就變成是360毫米，「那就是大豪雨等級了！」
