{"id":529,"date":"2008-04-20T05:00:00","date_gmt":"2008-04-19T21:00:00","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=529"},"modified":"2010-11-11T18:19:19","modified_gmt":"2010-11-11T10:19:19","slug":"%e5%85%ab%e8%99%9f%e9%a2%a8%e7%90%83%e8%88%87%e9%bb%91%e8%89%b2%e6%9a%b4%e9%9b%a8","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e5%85%ab%e8%99%9f%e9%a2%a8%e7%90%83%e8%88%87%e9%bb%91%e8%89%b2%e6%9a%b4%e9%9b%a8\/","title":{"rendered":"\u516b\u865f\u98a8\u7403\u8207\u9ed1\u8272\u66b4\u96e8"},"content":{"rendered":"

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<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"

浣熊襲港，澳門掛起八號風球，香港卻發出三號風球及黑色暴雨警告，引來市民質疑。兩者有甚麼分別？ 風球與暴雨警告是兩個不同的警告系統。 風球是用來警告風力，分為一號、三號、八號、九號、十號五級。當天文台發出八號或以上風球時，市民應留在家中。如在上班\/上課期間發出，市民應盡早回家。 熱帶氣旋影響時間比較長，為免市民上班上學造成混亂，發出八號風球的時間多在清早。如未及在清早發出，則會先發出「八號風球預警」，給予市民大約兩小時準備。 暴雨警告是用來警告雨量，分為黃色、紅色、黑色三級。當天文台發出黑色暴雨警告信號時，市民應留在家中。如在上班\/上課期間發出，市民應如常工作\/上學，不應冒雨回家。 暴雨來得急而且強度大，暴雨警告信號可以在短時間內多次轉變，無可避免造成混亂。另一方面，暴雨影響的時間比較短，暴雨後天氣迅速好轉，不了解的市民會質疑警告發出的需要性。 浣熊引致香港帶來強風和大雨，因此天文台先後發出三號風球、黃色及紅色暴雨警告。其後雨勢轉大，但風力未有增強，所以天文台發出黑色暴雨警告而不是八號風球。 有人會問：澳門懸掛八號風球，為甚麼香港只發出三號？（香港已於2002年取消「懸掛 」風球而改為「發出」） 熱帶氣旋的風力於中心附近最強，往外逐漸減弱，我們以「烈風圈」表示受熱帶氣旋影響吹烈風的半徑範圍。例如烈風圈為100公里時，表示距離熱帶氣旋中心100公里半徑內吹烈風。當熱帶氣旋增強時，烈風圈增大；當熱帶氣旋減弱時，烈風圈縮小。 浣熊由西南面接近，因此距離澳門比較近，加上接近時正在減弱，烈風圈同時縮小。香港與澳門距離約90公里，別少看這90公里，假如澳門在烈風圈內而香港在烈風圈外，香港便不受烈風吹襲。天文台網站的船舶熱帶氣旋警告提供烈風圈的資料，可供參考。 因此香港與澳門的風球高低，除了人為因素外，也受熱帶氣旋的強度、位置及移動方向影響，不一定每次相同。明白這點便不會被誤導了。<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","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":[4],"tags":[],"class_list":["post-529","post","type-post","status-publish","format-standard","hentry","category-4"],"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\/529","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=529"}],"version-history":[{"count":1,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/529\/revisions"}],"predecessor-version":[{"id":704,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/529\/revisions\/704"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=529"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=529"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=529"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}