{"id":8310,"date":"2026-01-22T07:30:00","date_gmt":"2026-01-21T23:30:00","guid":{"rendered":"https:\/\/tommykwan.com\/blog\/?p=8310"},"modified":"2026-01-22T08:18:55","modified_gmt":"2026-01-22T00:18:55","slug":"whats-jet-stream","status":"publish","type":"post","link":"https:\/\/tommykwan.com\/blog\/aviation\/whats-jet-stream\/","title":{"rendered":"What\u2019s Jet Stream?"},"content":{"rendered":"\n<p>jet stream is&nbsp;<mark class=\"HxTRcb\">a high speed, narrow band of westerly wind at high altitude !<\/mark><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u984c\u5916\u8a71\uff1a \u91cd\u63a8\u672c\u6587\u4fc2\u56e0\u70ba\u6211study buddy \u540c\u6211\u6eab\u66f8\u5f8c\uff0c\u6211\u89ba\u5f97\u543e\u592a\u719f\u5462\u500btopic! \ud83d\ude06<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>How fast (is the speed) of a jet stream?<\/strong><\/p>\n\n\n\n<p>Typical jet stream can has a speed of 100 KT to 200 KT!<\/p>\n\n\n\n<p>BUT minimum at least 60KT<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Fact check info on <a href=\"https:\/\/skybrary.aero\/articles\/jet-stream#:~:text=A%20second%20jet%20stream%20sometimes,particularly%20over%20south-east%20Asia.\">https:\/\/skybrary.aero\/articles\/jet-stream#:~:text=A%20second%20jet%20stream%20sometimes,particularly%20over%20south-east%20Asia.<\/a><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>How high of the location of jet stream?<\/strong><\/p>\n\n\n\n<p>In between 9-16 km, if my memory correct: it is equivalent to approximately FL300 to FL500.<\/p>\n\n\n\n<p>Rightly, it is near the <strong>tropopause<\/strong> height.<\/p>\n\n\n\n<p>X-check info: <a href=\"https:\/\/www.noaa.gov\/jetstream\/global\/jet-stream\">https:\/\/www.noaa.gov\/jetstream\/global\/jet-stream<\/a><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>What doesn\u2019t \u201cnarrow band\u201d means?<\/strong><\/p>\n\n\n\n<p>You can imagine the jet stream is a flat tubular (column) of air current &#8211; with only few kilometre in thickness!<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Let\u2019s talk about how to form \/ why the jet stream form?<\/strong><\/p>\n\n\n\n<p>Here&#8217;s a step-by-step breakdown:<\/p>\n\n\n\n<ol class=\"wp-block-list IaGLZe VimKh\">\n<li><strong class=\"Yjhzub\">Uneven Heating<\/strong>: The Sun heats the equator more than the poles, creating large temperature differences.<\/li>\n\n\n\n<li><strong class=\"Yjhzub\">Coriolis Effect<\/strong>: Earth&#8217;s rotation deflects the air (right in the Northern Hemisphere), turning the wind from north-south into a predominantly west-to-east flow, creating the jet stream.<\/li>\n\n\n\n<li><strong class=\"Yjhzub\">Jet Stream Formation<\/strong>: <br>Using the Polar Jet Stream as an example, it is formed as a result of the temperature gradient between the cold polar&nbsp;<a href=\"https:\/\/skybrary.aero\/index.php\/Air_Masses\">air mass<\/a>&nbsp;and the warmer sub-tropical air mass.&nbsp;<\/li>\n<\/ol>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"embed-container\"><iframe loading=\"lazy\" title=\"What Is the Jet Stream?\" width=\"1170\" height=\"658\" src=\"https:\/\/www.youtube.com\/embed\/o203JXAnSA0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"embed-container\"><iframe loading=\"lazy\" title=\"What is the jet stream and how does it affect the weather?\" width=\"1170\" height=\"658\" src=\"https:\/\/www.youtube.com\/embed\/Lg91eowtfbw?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"embed-container\"><iframe loading=\"lazy\" title=\"How jet streams affect our weather: an in-depth guide\" width=\"1170\" height=\"658\" src=\"https:\/\/www.youtube.com\/embed\/5wCq2Y9CB6Y?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Types of jet stream?<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"embed-container\"><iframe loading=\"lazy\" title=\"The jet stream\" width=\"1170\" height=\"658\" src=\"https:\/\/www.youtube.com\/embed\/9kWy85QS7Cg?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"embed-container\"><iframe loading=\"lazy\" title=\"Jet streams from around the world\" width=\"1170\" height=\"658\" src=\"https:\/\/www.youtube.com\/embed\/OMdWD0JkBz4?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>jet stream is&nbsp;a high speed, narrow band of westerly wind at high altitude ! \u984c\u5916\u8a71\uff1a \u91cd\u63a8\u672c\u6587\u4fc2\u56e0\u70ba\u6211study buddy \u540c\u6211\u6eab\u66f8\u5f8c\uff0c\u6211\u89ba\u5f97\u543e\u592a\u719f\u5462\u500btopic! \ud83d\ude06 How fast (is the speed) of a jet stream? Typical jet stream can has a speed of 100 KT to 200 KT! BUT minimum at least 60KT Fact check info on https:\/\/skybrary.aero\/articles\/jet-stream#:~:text=A%20second%20jet%20stream%20sometimes,particularly%20over%20south-east%20Asia. How high of the<a class=\"read-more \" href=\"https:\/\/tommykwan.com\/blog\/aviation\/whats-jet-stream\/\" title=\"Read More\"> <span class=\"button default\">Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68,64,72],"tags":[],"class_list":["post-8310","post","type-post","status-publish","format-standard","hentry","category-atpl-knowledge","category-aviation","category-meteorology"],"_links":{"self":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/8310","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/comments?post=8310"}],"version-history":[{"count":15,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/8310\/revisions"}],"predecessor-version":[{"id":10275,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/8310\/revisions\/10275"}],"wp:attachment":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/media?parent=8310"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/categories?post=8310"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/tags?post=8310"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}