{"id":588,"date":"2006-09-24T05:00:00","date_gmt":"2006-09-23T21:00:00","guid":{"rendered":"http:\/\/www.weather.org.hk\/blog\/?p=588"},"modified":"2010-11-11T18:24:11","modified_gmt":"2010-11-11T10:24:11","slug":"%e5%bc%b7%e9%a2%a8%e8%88%87%e6%98%82%e5%9d%aa%e7%ba%9c%e8%bb%8a","status":"publish","type":"post","link":"https:\/\/www.weather.org.hk\/news\/%e5%bc%b7%e9%a2%a8%e8%88%87%e6%98%82%e5%9d%aa%e7%ba%9c%e8%bb%8a\/","title":{"rendered":"\u5f37\u98a8\u8207\u6602\u576a\u7e9c\u8eca"},"content":{"rendered":"

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

近日本港吹起強風，星期日昂坪纜車更因強風減慢車速甚至暫停服務。吹強風的原因是甚麼？ 踏入九月，香港開始受東北季候風影響。中國內陸氣壓上升形成高壓區，然後向東移出太平洋。從星期日晚上8時的天氣圖中可看到有一高壓區在黃海附近，等壓線成「U」形並沿著中國東南沿岸伸延至香港附近。 這種等壓線的配置常引致香港吹偏東強風，多雲及有微雨。等壓線越密，表示氣壓梯度（氣壓差）越大，風力越強。預測方面，我們以上海與香港的氣壓差作為指標，定義為Δp(S)=上海氣壓-香港氣壓。當Δp(S)升至8或以上，香港離岸及高地可能吹強風（尤其晚間）。 現時海南島附近的熱帶低氣壓亦有助增加氣壓梯度（氣壓一高一低，氣壓差增加），令本港風力增強。 昂坪纜車沿山而建，高地風速通常比地面為高。事實上，昂坪氣象站星期日整日吹強風至烈風，陣風更達暴風，對纜車運作構成影響。 下次大家到離島或高地時，不妨先留意天氣圖上等壓線的配置及氣象站風速，才決定是否起行。<\/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-588","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\/588","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=588"}],"version-history":[{"count":1,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/588\/revisions"}],"predecessor-version":[{"id":731,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/posts\/588\/revisions\/731"}],"wp:attachment":[{"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/media?parent=588"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/categories?post=588"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.weather.org.hk\/news\/wp-json\/wp\/v2\/tags?post=588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}