{"id":9270,"date":"2024-08-24T13:02:51","date_gmt":"2024-08-24T05:02:51","guid":{"rendered":"https:\/\/tommykwan.com\/blog\/?p=9270"},"modified":"2024-08-24T13:59:02","modified_gmt":"2024-08-24T05:59:02","slug":"vhhh-windshear-and-turbulence-information","status":"publish","type":"post","link":"https:\/\/tommykwan.com\/blog\/aviation\/vhhh-windshear-and-turbulence-information\/","title":{"rendered":"VHHH windshear and turbulence information"},"content":{"rendered":"<p>Reference:<\/p>\n<p><a href=\"https:\/\/www.hko.gov.hk\/en\/aviat\/articles\/files\/booklet_4th_edition.pdf\">https:\/\/www.hko.gov.hk\/en\/aviat\/articles\/files\/booklet_4th_edition.pdf<\/a><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"text-decoration: underline;\">Two ways to deliver W\/S or TURB information in VHHH<\/span><\/p>\n<p><strong>Warning\u00a0<\/strong>&#8211; via Voice-ATIS, Digital-ATIS (D-ATIS)<\/p>\n<p><strong>Alert <\/strong>&#8211;\u00a0 generated automatically by the real time &#8220;up-to-the-minute&#8221; Windshear and Turbulence Warning System (WTWS), but passed to the aircraft via ATC<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"text-decoration: underline;\">Two levels of of Windshear alerts<\/span><\/p>\n<ol>\n<li><strong><span style=\"color: #ff0000;\">Microburst alert<\/span> (MBA) &#8211;<br \/>\n<\/strong>expect headwind<span style=\"color: #ff6600;\"> <strong>loss<\/strong> of 30KT<\/span> or greater <strong><span style=\"color: #ff6600;\">AND precipitation<\/span><\/strong> is present (only be generated by the TDWR)<\/li>\n<li><strong><span style=\"color: #ff0000;\">Windshear alert<\/span> (WSA)<\/strong> &#8211;\n<ul>\n<li>expect headwind <span style=\"color: #ff0000;\">loss or gain of 15 KT or greater<\/span> ; OR<\/li>\n<li>headwind gain of 30KT or greater ; OR<\/li>\n<li>headwind loss of 30KT or greater, BUT NO precipitation present<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>Notes: \u5929\u6587\u53f0\u6307\u51faMBA \u7d14\u7cb9\u4ee3\u8868\u7531TDWR detect \u5230\u6709wind loss of 30KT AND with precipitation present &#8211; \u4e26\u4e0d\u4ee3\u8868\u4fc2\u5178\u578bmicrobust~<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"text-decoration: underline;\">Two common levels of Turbulence alerts<\/span><\/p>\n<ul>\n<li>Severe turbulence alert\n<ul>\n<li>EDR 0.5 or above<\/li>\n<\/ul>\n<\/li>\n<li>Moderate turbulence alert\n<ul>\n<li>EDR 0.3 &#8211; 0.5<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Important:<\/p>\n<ol>\n<li>HKO WTWS use weather sensor to continuously monitor possible occurrence of <strong>turbulence within 3NM of the runway thresholds<\/strong><\/li>\n<li>EDR with reference to heavy category aircraft (i.e A330, B777)<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<div class=\"embed-container\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"4jUZzv1Cj9\"><p><a href=\"https:\/\/tommykwan.com\/blog\/aviation\/eddy-dissipation-rate-edr-%e4%b8%80%e5%80%8b%e5%90%8cturbulence-intensity-%e6%9c%89%e9%97%9c%e6%97%a2%e8%a9%9e%e5%bd%99\/\">Eddy Dissipation Rate (EDR) &#8211; \u4e00\u500b\u540cturbulence intensity \u6709\u95dc\u65e2\u8a5e\u5f59!<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;Eddy Dissipation Rate (EDR) &#8211; \u4e00\u500b\u540cturbulence intensity \u6709\u95dc\u65e2\u8a5e\u5f59!&#8221; &#8212; Tommy&#039;s Diaries\" src=\"https:\/\/tommykwan.com\/blog\/aviation\/eddy-dissipation-rate-edr-%e4%b8%80%e5%80%8b%e5%90%8cturbulence-intensity-%e6%9c%89%e9%97%9c%e6%97%a2%e8%a9%9e%e5%bd%99\/embed\/#?secret=XeIaA1pUjR#?secret=4jUZzv1Cj9\" data-secret=\"4jUZzv1Cj9\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/div>\n<p>&nbsp;<\/p>\n<p>\u503c\u5f97\u7559\u610f\u65e2\u4fc2, somehow<strong> WTWS \u6709\u9650\u5236\uff0c\u5c0dairrival and departure corridor \u65e2coverage \u90fd\u6709\u4e0d\u540c:<\/strong><\/p>\n<p><a href=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/08\/WST-alerts-for-VHHH-arrival.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-9287\" src=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/08\/WST-alerts-for-VHHH-arrival.png\" alt=\"\" width=\"668\" height=\"435\" srcset=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/08\/WST-alerts-for-VHHH-arrival.png 668w, https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/08\/WST-alerts-for-VHHH-arrival-300x195.png 300w\" sizes=\"auto, (max-width: 668px) 100vw, 668px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/08\/WST-alerts-for-VHHH-departurel.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-9286\" src=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/08\/WST-alerts-for-VHHH-departurel.png\" alt=\"\" width=\"698\" height=\"444\" srcset=\"https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/08\/WST-alerts-for-VHHH-departurel.png 698w, https:\/\/tommykwan.com\/blog\/wp-content\/uploads\/2024\/08\/WST-alerts-for-VHHH-departurel-300x191.png 300w\" sizes=\"auto, (max-width: 698px) 100vw, 698px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Reference: https:\/\/www.hko.gov.hk\/en\/aviat\/articles\/files\/booklet_4th_edition.pdf &nbsp; Two ways to deliver W\/S or TURB information in VHHH Warning\u00a0&#8211; via Voice-ATIS, Digital-ATIS (D-ATIS) Alert &#8211;\u00a0 generated automatically by the real time &#8220;up-to-the-minute&#8221; Windshear and Turbulence Warning System (WTWS), but passed to the aircraft via ATC &nbsp; Two levels of of Windshear alerts Microburst alert (MBA) &#8211; expect headwind loss of<a class=\"read-more \" href=\"https:\/\/tommykwan.com\/blog\/aviation\/vhhh-windshear-and-turbulence-information\/\" 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":[64],"tags":[],"class_list":["post-9270","post","type-post","status-publish","format-standard","hentry","category-aviation"],"_links":{"self":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/9270","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=9270"}],"version-history":[{"count":12,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/9270\/revisions"}],"predecessor-version":[{"id":9292,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/9270\/revisions\/9292"}],"wp:attachment":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/media?parent=9270"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/categories?post=9270"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/tags?post=9270"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}