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#香港暴雨統計
香港天文台因應去年九月的「世紀暴雨」,今年雨季開始加強類似惡劣天氣的訊息發佈,並定義了兩個新詞彙(5月4日出現過):「大暴雨」及「特大暴雨」,以識別遠超黑色暴雨警告標準的雨勢;前者表示一小時雨量超過100毫米的雨勢,後者則表示一小時雨量超過140毫米的雨勢。

自1984年建立自動雨量站網絡以來,本港不同地區總共有103日出現大暴雨或以上雨勢(即每年有約2.5日),當中有9日達到特大暴雨級別。過去四十年出現上述雨勢的月份主要在五月、六月及八月,其次為七月及九月;而受特大暴雨影響的地區以東部、南部及市區居多,發生如此級別的暴雨時一般正受到低壓槽影響,相信同時配合其他有利觸發對流的條件,如高層輻散、低空急流。

本港有紀錄以來最大雨勢發生於1994年7月22日的荃灣區,時雨量達約211.5毫米,是首次在七月出現特大暴雨。

雖然每次發生極端天氣未必能直接與氣候變暖掛勾,但基於空氣愈暖、愈能承載更多水汽的特質,氣候暖化無疑會令大氣含水量增加(地球每上升一度,大氣含水量增加約7%)。近年愈來愈熱,擔心未來可能發生更頻密及極端的暴雨,並引發更嚴重的水浸、山洪及山泥傾瀉等災害。



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#香港暴雨統計
香港天文台因應去年九月的「世紀暴雨」,今年雨季開始加強類似惡劣天氣的訊息發佈,並定義了兩個新詞彙(5月4日出現過):「大暴雨」及「特大暴雨」,以識別遠超黑色暴雨警告標準的雨勢;前者表示一小時雨量超過100毫米的雨勢,後者則表示一小時雨量超過140毫米的雨勢。

自1984年建立自動雨量站網絡以來,本港不同地區總共有103日出現大暴雨或以上雨勢(即每年有約2.5日),當中有9日達到特大暴雨級別。過去四十年出現上述雨勢的月份主要在五月、六月及八月,其次為七月及九月;而受特大暴雨影響的地區以東部、南部及市區居多,發生如此級別的暴雨時一般正受到低壓槽影響,相信同時配合其他有利觸發對流的條件,如高層輻散、低空急流。

本港有紀錄以來最大雨勢發生於1994年7月22日的荃灣區,時雨量達約211.5毫米,是首次在七月出現特大暴雨。

雖然每次發生極端天氣未必能直接與氣候變暖掛勾,但基於空氣愈暖、愈能承載更多水汽的特質,氣候暖化無疑會令大氣含水量增加(地球每上升一度,大氣含水量增加約7%)。近年愈來愈熱,擔心未來可能發生更頻密及極端的暴雨,並引發更嚴重的水浸、山洪及山泥傾瀉等災害。

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