{"id":1287,"date":"2021-01-16T23:05:39","date_gmt":"2021-01-16T15:05:39","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=1287"},"modified":"2021-01-17T16:14:16","modified_gmt":"2021-01-17T08:14:16","slug":"%e4%b9%be%e5%87%8d%e8%88%87%e6%bf%95%e5%87%8d-2","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e4%b9%be%e5%87%8d%e8%88%87%e6%bf%95%e5%87%8d-2\/","title":{"rendered":"\u4e7e\u51cd\u8207\u6fd5\u51cd"},"content":{"rendered":"

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冬季香港不時受寒潮南下影響，俗稱「翻風」。當內陸的高壓中心在香港以北時，香港吹北風，氣溫下降，稱為北風潮（northerly surge）；當高壓中心移至上海附近（即香港東北時），香港吹東風，風勢頗大，稱為東風潮（easterly surge）。 北風潮影響香港的時候，假如天晴乾燥，即所謂「乾凍」，人感覺比較舒適，甚至外出進行戶外活動。但假如天陰有雨，即所謂「濕凍」，人感覺更加寒冷，寧願留在室內。究竟是甚麼因素決定北風潮時的天氣？ 影響華南的冷空氣有不同的厚度。冷空氣厚的時候，北風比較厚，地面和高空均吹北風；冷空氣薄的時候，北風比較薄，雖然地面吹北風，但高空卻吹南風。由於南風來自海洋，比北風溫暖及潮濕，當兩者相遇時，便會形成對流產生雲和雨。 在盛冬（十一月及十二月），冷空氣一般比較厚，因此地面及高空風向一致，北風潮多數帶來晴朗天氣。在冬末（一月及二月），華南沿岸上空開始受海洋性氣流影響，轉吹南風，此時南下的冷空氣亦比較薄，於是出現地面吹北風、高空吹南風的情況，帶來陰雨天氣的次數增多。 寒潮南下時，我們只要留意高空的風向，便可預測是乾凍還是濕凍。不過無論冷空氣是厚是薄，一樣可以為香港帶來寒冷甚至嚴寒天氣。 延伸閱讀：傳統的「乾冬濕年」有多準？<\/p>\n","protected":false},"author":2,"featured_media":3019,"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":[43],"tags":[],"class_list":["post-1287","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-43"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.weather.org.hk\/news\/wp-content\/uploads\/2021\/01\/5f789556-27ab-11ea-9939-941d1970c7f1_image_hires_121119.jpg?fit=1098%2C732&ssl=1","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/1287","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=1287"}],"version-history":[{"count":8,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/1287\/revisions"}],"predecessor-version":[{"id":3056,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/1287\/revisions\/3056"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media\/3019"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=1287"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=1287"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=1287"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}