今年截至目前12个热带气旋影响香港 破1946年以来纪录|极品尤物一区二区三区
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中新网香港10月3日电 今年第21号台风“麦德姆”3日进入香港800公里范围内,香港天文台当日19时40分发出一号戒备信号(俗称“一号风球”)。香港天文台表示,截至10月3日,包括“麦德姆”在内,今年共有12个热带气旋导致天文台需要发出热带气旋警告信号,打破1946年以来的最高纪录。

香港天文台说,今年影响香港的热带气旋数目较正常偏多的主要成因可归纳为两方面。海洋条件方面,今年6月至9月西太平洋海面温度较正常偏高,尤其是西太平洋暖水区面积较大,广阔的暖水区提供充足的热能及较高的大气不稳定度,促进积云对流发展,有利热带气旋形成。
大气环流方面,今年6月至9月副热带高压脊较长时间呈现偏西伸展的态势。这不但降低了热带气旋于西北太平洋转向偏北路径的机会,亦使副热带高压脊南侧的东风引导气流在菲律宾附近海域形成有利的通道,让在西北太平洋或南海形成的热带扰动或热带气旋移向南海北部,增大影响华南沿岸及香港的概率。
香港天文台预测,“麦德姆”会在未来一两日横过南海中北部,逐渐增强,大致移向雷州半岛至海南岛东部一带。香港10月4日至5日天气渐转不稳定,风势颇大,海面有大浪及涌浪,间中有狂风骤雨。天文台考虑10月4日改发三号强风信号。(完)
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