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

強烈東北季候風影響香港，昨晚北風明顯增強。今早外出時街上滿佈垃圾，有如熱帶氣旋吹襲。 九月開始，香港受東北季候風影響，大部分時間吹東北風。當中國北部的冷空氣累積並向南擴展時，香港風力將會增強。天文台根據風向分為北風潮（北風）和東風潮（東風）。  天文台昨晚發出強烈季候風信號。強烈季候風信號表示香港吹強風，平均風速超過每小時40公里，有如三號風球的風力（強烈季候風信號注意事項）。信號生效期間，新界（西貢、大尾篤）、離島（長洲、塔門）及高地（大老山、昂坪）錄得的陣風達烈風程度，而大老山最高陣風更高達每小時107公里，接近颶風程度。強烈季候風信號的危險性絕對不容忽視，前往高地、離島及進行水上活動前必須謹慎考慮。 風力與氣壓梯度成正比。天氣圖上等壓線越密，表示氣壓梯度越大，風力越強。今早天氣圖上華南沿岸出現緊密的等壓線，呈東北-西南走向： 這是典型的北風潮（俗稱「返北風」）情況。   北風潮南下時，香港以北地區的氣壓首先上升。天文台利用湖南省的郴州（紅星位置）與香港的氣壓差制定指數，稱為Δp(972) （彬州的國際氣象組織城市代號為57972）。當Δp(972) 上升至7百帕以上時，北風潮約於15小時後到達香港。假如Δp(972)上升至 10 百帕以上，香港可能吹強風： Δp(972)於昨天早上升至10百帕以上，因此晚間為香港帶來強風。留意Δp(972)的變化，能有效預測「返風」時間及可能風力。 有關Δp(972)的詳情及應用，可參考地下天文台主頁。<\/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-610","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\/610","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=610"}],"version-history":[{"count":1,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/610\/revisions"}],"predecessor-version":[{"id":709,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/610\/revisions\/709"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=610"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=610"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=610"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}