{"id":989,"date":"2011-09-30T11:37:19","date_gmt":"2011-09-30T03:37:19","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=989"},"modified":"2011-10-01T01:22:04","modified_gmt":"2011-09-30T17:22:04","slug":"%e7%b4%8d%e6%b2%99%e9%9b%9c%e8%ab%87","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e7%b4%8d%e6%b2%99%e9%9b%9c%e8%ab%87\/","title":{"rendered":"\u7d0d\u6c99\u96dc\u8ac7"},"content":{"rendered":"

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\u6709 Facebook \u7db2\u53cb\u4e0d\u660e\u767d\u70ba\u4f55\u8eab\u8655\u5730\u5340\u975e\u5e38\u5927\u98a8\uff0c\u5929\u6587\u53f0\u537b\u4e0d\u5373\u6642\u6539\u767c\u516b\u865f\u98a8\u7403\uff0c\u7d50\u679c\u82e6\u5b88\u96fb\u8166\u524d\u57cb\u6028\u800c\u4e0d\u4e0a\u5e8a\u7761\u89ba\u3002\u5929\u6587\u53f0\u57282007\u5e74\u4fee\u8a02\u4e86\u71b1\u5e36\u6c23\u65cb\u8b66\u544a\u7cfb\u7d71<\/a>\uff0c\u4ee5\u516b\u500b\u6307\u5b9a\u6c23\u8c61\u7ad9\u7684\u98a8\u529b\u4f5c\u70ba\u767c\u51fa\u98a8\u7403\u7684\u53c3\u8003\uff0c\u800c\u4e26\u975e\u8003\u616e\u6700\u9ad8\u98a8\u529b\u7684\u6c23\u8c61\u7ad9\u3002\u800c\u516b\u500b\u6307\u5b9a\u6c23\u8c61\u7ad9\u4e2d\uff0c\u4ee5\u9577\u6d32\u3001\u897f\u8ca2\u3001\u8d64\u81d8\u89d2\u548c\u555f\u5fb7\u6700\u6709\u4ee3\u8868\u6027\u3002<\/p>\n

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颱風納沙襲港，天文台於星期四早上四時四十分發出八號風球，直至下午四時十分才改發三號風球。傳說中的「李氏力場」被摧毀，天文台被指「唔發又發」引來批評。然而假如不發，可能又有市民在天星碼頭被垃圾桶KO，皆因天星碼頭在星期四早上時間的風力跟2006年派比安襲港時差不多: 地下天文台於今年四月成立 Facebook 專頁，提供另一平台與大眾分享天氣資訊，至今已有四千多名「粉絲」。納沙襲港期間，我與一眾管理員不斷分析情況及更新資訊，發現香港各區風力於星期三午夜後持續上升，天文台有可能需要改發八號風球。天文台亦當機立斷，在上午2時的風暴消息中提及改發八號風球的可能性，只是市民多已就寢，未有留意。 天氣瞬息萬變，有時並無規則可循。很多市民以為風球的發出與否，與熱帶氣旋距離香港的近遠有關，然而這並不正確。風球是用來警告香港的風力，而由於熱帶氣旋結構各有不同，風場大小有異，大型的熱帶氣旋，即使在較遠的距離仍能對香港構成威脅。納沙在星期三下午時的烈風圈（黃色範圍）仍然離香港甚遠： 然而到了晚上，隨著納沙稍為增強，烈風圈向外擴展，覆蓋華南沿岸： 所以即使納沙與香港距離超過350公里，香港仍然受烈風吹襲。翻看記錄，天文台近30年也有幾次在熱帶氣旋與香港距離超過300公里時發八號風球： 年份及名稱 發出八號風球時 與香港距離（公里） 1980 喬伊 370 1995 斯寶 310 2003 伊布都 310 2011 納沙 360 有 Facebook 網友不明白為何身處地區非常大風，天文台卻不即時改發八號風球，結果苦守電腦前埋怨而不上床睡覺。天文台在2007年修訂了熱帶氣旋警告系統，以八個指定氣象站的風力作為發出風球的參考，而並非考慮最高風力的氣象站。而八個指定氣象站中，以長洲、西貢、赤臘角和啟德最有代表性。 成立 Facebook 專頁後還有很多有趣見聞，容後再談。<\/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-989","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\/989","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=989"}],"version-history":[{"count":15,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/989\/revisions"}],"predecessor-version":[{"id":1007,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/989\/revisions\/1007"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=989"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=989"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=989"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}