{"id":533,"date":"2008-11-27T06:00:00","date_gmt":"2008-11-26T22:00:00","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=533"},"modified":"2010-11-11T18:18:24","modified_gmt":"2010-11-11T10:18:24","slug":"%e9%a2%a8%e5%be%9e%e5%93%aa%e8%a3%a1%e4%be%86","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e9%a2%a8%e5%be%9e%e5%93%aa%e8%a3%a1%e4%be%86\/","title":{"rendered":"\u98a8\u5f9e\u54ea\u88e1\u4f86"},"content":{"rendered":"

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\u00a0<\/p>\n

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

秋去冬來，老人家說「翻風」，究竟風從哪裡來？ 風是空氣流動的結果，空氣由氣壓較高的地方流向氣壓較低的地方。夏季時，海洋的氣壓較陸地為高，風由海洋吹向陸地，所以夏季香港吹南風。冬季陸地的氣壓較海洋為高，風由陸地吹向海洋，所以冬季香港吹北風。 「翻風」是冷空氣在中國北部累積的結果。在北方，秋季陽光變得斜射，地面吸收的熱量不及散失的多，地面開始降溫，接近地面的空氣被冷卻、累積、氣壓上升，有如水庫蓄洪。當冷空氣累積至一定程度時便向南擴展，有如水庫排洪一樣，為經過的地方帶來天氣轉變，包括氣溫下降、風力增強、雨、雪等。 當冷空氣由北面進入廣東省影響香港時，香港北風增強、氣溫下降、天氣變得乾燥，容易引起山火。受城市化影響，新界地區晚間氣溫可能比市區低5度以上，市民應小心保暖。 假如冷空氣受南嶺阻擋無法進入廣東省，或中國北部的高壓區移動迅速，冷空氣改由台灣海峽南下影響香港，香港東風增強。由於空氣流經海路變得較暖及潮濕，因此氣溫下降較不明顯，但天氣變得多雲有雨，離岸風力可能達強風程度（有如三號風球），市民應停止水上活動。 天文台參考香港與鄰近地區的氣壓變化來預測「翻風」的時間。簡單而言，北風到達前，香港以北地區的氣壓會上升；東風到達前，中國東南沿岸的氣壓會上升。市民可留意天氣圖上的等壓線分佈，預知「翻風」。 （上）翻北風時的天氣圖（下）翻東風時的天氣圖 至於老人家常說的「乾凍」和「濕凍」，則取決於冷空氣的厚度。當冷空氣較厚，天氣寒冷但天晴乾燥，俗稱「乾凍」。當冷空氣較薄，與高空的暖空氣混合產生多雲有雨的天氣，俗稱「濕凍」。「乾凍」多於十一月至一月初出現，之後香港上空開始受暖空氣影響，較常出現「濕凍」，因此有「乾冬濕年」的說法。農曆新年期間的煙花匯演多是陰天也是這個道理。  <\/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-533","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\/533","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=533"}],"version-history":[{"count":1,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/533\/revisions"}],"predecessor-version":[{"id":700,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/533\/revisions\/700"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}