{"id":2686,"date":"2020-08-01T02:14:51","date_gmt":"2020-07-31T18:14:51","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=2686"},"modified":"2021-01-17T00:10:15","modified_gmt":"2021-01-16T16:10:15","slug":"%e7%94%9a%e9%ba%bc%e6%98%af%e3%80%8c%e9%bb%91%e7%90%83%e3%80%8d","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e7%94%9a%e9%ba%bc%e6%98%af%e3%80%8c%e9%bb%91%e7%90%83%e3%80%8d\/","title":{"rendered":"\u751a\u9ebc\u662f\u300c\u9ed1\u7403\u300d?"},"content":{"rendered":"

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\"blackball\"<\/a>
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\"monsoonlow\"<\/a>
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受季風低壓影響，天文台昨日發出「黑球」。 「黑球」的全名是強烈季候風信號。在香港懸掛信號的年代，強烈季候風信號的標誌是一個球，晚間的燈號是「白綠白」，於是便有「黑球」之稱。「黑球」一般用來警告冬季季候風（通常為北風或東風）或夏季季候風（通常為西南風）為香港帶來強風或以上的風力，有時亦會用來警告非熱帶氣旋帶來的強風（例如季風低壓）。 圖：澳門大炮台懸掛「黑球」的情景（來源：Wikipedia） 而市民較為熟悉的三號風球，是熱帶氣旋警告信號之一，標誌是「⊥」，晚間的燈號是「綠白綠」，用來警告熱帶氣旋為香港帶來普遍強風。如果強風只局限於離岸或高地，則可用一號風球表示。 因此「黑球」的風力等同三號風球。由於海面風浪頗大，市民不應進行水上活動。不過每年都有市民漠視「黑球」的威力進行水上活動，結果發生意外甚至造成傷亡。 在熱帶海洋上，由對流活動產生的熱帶擾動可進一步發展為熱帶低氣壓或季風低壓，但兩者結構並不相同：熱帶低氣壓最強對流及最大風區域在中心附近；季風低壓最強對流及最大風區域則在中心外圍，有時距離中心可以超過300公里。 昨日影響香港的季風低壓，由於中心缺乏對流，最大風區域在中心以北，因此不能稱為熱帶低氣壓，即使引致香港吹強風甚至烈風，天文台也只會發出「黑球」而不會發出「風球」。隨著季風低壓的結構改善，中心附近開始有對流發展，天文台於晚間升格為熱帶低氣壓，並改發三號風球。兩者警告的風力相等，但原因不同。上一次出現類似情況是1993年9月25日熱帶氣旋黛蒂。香港先受季候風影響，天文台掛起「黑球」。後來黛蒂移近廣東沿岸並影響香港天氣，天文台改掛三號風球（翌日早上更懸掛八號風球）。 這跟2000年6月18日一個熱帶低氣壓在大嶼山以南海面突然形成，天文台直接掛起三號風球的性質不一樣。 圖：2020年7月30日及31晚上的衛星雲圖，顯示季風低壓中心附近對流明顯增多，因此各地預報機構升格為熱帶低氣壓（來源:台灣中央氣象局）<\/p>\n","protected":false},"author":2,"featured_media":2688,"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":[41],"tags":[],"class_list":["post-2686","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-41"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.weather.org.hk\/news\/wp-content\/uploads\/2020\/08\/CQ9R1lpUwAAwUXy.png?fit=506%2C253&ssl=1","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/2686","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=2686"}],"version-history":[{"count":11,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/2686\/revisions"}],"predecessor-version":[{"id":2714,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/2686\/revisions\/2714"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media\/2688"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=2686"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=2686"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=2686"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}