weatherhk.blogspot.com
望天打卦
望天打卦 香港天氣觀測站和港澳氣旋監測站網誌 Hong Kong Weather Watch & Hong Kong - Macao Cyclone Watch Official Blog 2014年4月6日星期日 甚麼是「N年一遇」?「千年一遇」等說法是不是空談? 過去幾天本港經歷大雨冰雹天氣,之後天文台及渠務署就該場大雨的罕見程度各自表述。渠務署稱大家對重現期 (return period) 估計的差異源於量度尺度之不同,這引發坊間對「N年一遇」等說法的討論。 1.「N年一遇」的含義 ...
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