{"id":3586,"date":"2020-10-24T19:54:51","date_gmt":"2020-10-24T11:54:51","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=3586"},"modified":"2021-11-16T20:03:49","modified_gmt":"2021-11-16T12:03:49","slug":"%e6%b2%99%e5%be%b7%e7%88%be%e6%87%89%e7%99%bc%e9%bb%91%e7%90%83%e9%82%84%e6%98%af%e4%b8%89%e8%99%9f%e9%a2%a8%e7%90%83%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e6%b2%99%e5%be%b7%e7%88%be%e6%87%89%e7%99%bc%e9%bb%91%e7%90%83%e9%82%84%e6%98%af%e4%b8%89%e8%99%9f%e9%a2%a8%e7%90%83%ef%bc%9f\/","title":{"rendered":"\u6c99\u5fb7\u723e\u61c9\u767c\u9ed1\u7403\u9084\u662f\u4e09\u865f\u98a8\u7403\uff1f"},"content":{"rendered":"

\"1\"<\/a><\/p>\n

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\"2\"<\/a><\/p>\n

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\u9019\u6b21\u98a8\u96aa\u8655\u7406\u624b\u6cd5\uff0c\u5176\u5be6\u8ddf\u6d6a\u5361\u6709\u9ede\u76f8\u4f3c\u3002\u800c\u4e14\u8ddf\u6d6a\u5361\u4e00\u6a23\uff0c\u6c92\u6709\u7d55\u5c0d\u7684\u5c0d\u8207\u932f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

熱帶氣旋沙德爾橫過南海，香港天文台先後發出一號風球、三號風球及強烈季候風信號（俗稱黑球）來提醒市民。但亦有個說法指天文台其實只需發出黑球即可，程序上簡單得多。兩者有甚麼分別及考慮？ 十月份，廣東沿岸及南海北部已被東北季候風支配。當有熱帶氣旋進入南海時，由於氣壓梯度上升，沿岸風勢將會增強。這時候要判斷香港受季候風還是熱帶氣旋，才能決定發出甚麼警告。 在市民的認知中，熱帶氣旋影響香港時，多數會出現狂風驟雨，無雨甚至天晴（即俗稱「打乾風」）的情況較少見。另一方面，季候風影響香港時天氣通常較穩定，如果正在吹北風，更可能天晴乾燥。 而技術上，我們還有兩個指標可以看。 第一是香港的風向。當熱帶氣旋移至香港西南面時，香港會吹東南風。但三號風球當日香港都吹北至東北風，表示沙德爾的環流未有影響香港。 第二是露點（絕對濕度）變化。熱帶氣旋移近會帶來水汽，露點會上升。但觀看香港赤鱲角機場的露點變化，天文台於午夜發出三號風球時，露點約10度，日間則跌至7至8度，同樣未受沙德爾環流影響。 如果香港未有受到沙德爾的環流影響，那為甚麼天文台會選擇發出一號或三號風球？大概是考慮到數值預報可能出現的偏差。假如沙德爾持續增強及向西北移動，中心東北面的烈風圈就會擴展並可能覆蓋香港，香港就會出現烈風威脅。雖然沙德爾最後都轉回偏西方向移動，但中心風力曾一度上升至每小時140公里，的確是始料不及的。 換個角度去看，如果天文台發出黑球，但其後香港出現烈風威脅，天文台會如何處理？參考1993年颱風黛蒂的個案，就要將黑球轉為三號風球，再考慮是否發出八號風球。 這次風險處理手法，其實跟浪卡有點相似。而且跟浪卡一樣，沒有絕對的對與錯。<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[50,41],"tags":[],"class_list":["post-3586","post","type-post","status-publish","format-standard","hentry","category-50","category-41"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/3586","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/comments?post=3586"}],"version-history":[{"count":1,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/3586\/revisions"}],"predecessor-version":[{"id":3589,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/3586\/revisions\/3589"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=3586"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=3586"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=3586"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}