{"id":53784,"date":"2023-08-01T10:59:00","date_gmt":"2023-08-01T10:59:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=53784"},"modified":"2023-08-03T20:23:29","modified_gmt":"2023-08-03T20:23:29","slug":"typhoon-khanun-passes-just-south-of-okinawa-island","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/53784","title":{"rendered":"Typhoon Khanun passes just south of Okinawa Island"},"content":{"rendered":"

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JMA Himawari-9 \u201cRed\u201d Visible (0.64 \u00b5m, left) and \u201cClean\u201d Infrared Window (10.4 \u00b5m, right) images, from 0502-1002 UTC on 01 August [click to play animated GIF |\u00a0MP4<\/strong><\/a>]<\/p><\/div>Target Sector<\/strong><\/a>\u00a0(2.5-minute interval)\u00a0JMA<\/strong><\/a> Himawari-9 AHI<\/strong><\/a> Visible and Infrared images (above)<\/strong><\/em> showed Category 4 Typhoon Khanun as it moved just south of Okinawa Island<\/strong><\/a>\u00a0 from 0502-1002 UTC on 01 August 2023. Visible images depicted mesovortces within the eye.<\/p>\n

During that 0502-1002 UTC time period, peak wind gusts at the 3 METAR sites located in the southern part of the island were in the 70-78 knot range (below)<\/strong><\/em> — and soon thereafter reached 85 knots at Naha (ROAH)<\/strong><\/a> and Futenma<\/strong><\/a> (farther north, the peak wind gust at Kadena RODN<\/strong><\/a> was 76 knots).<\/p>\n

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15-minute METAR observations on the island of Okinawa, from 0000-1830 UTC on 01 August [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>Synthetic Aperture Radar (SAR) winds (source<\/strong><\/a>) from an overpass of RCM-3 at 0922 UTC (below)<\/strong><\/em> did show a swath of strong winds — with speeds in the 80-90 knot range — north and northwest of Khanun’s eyewall, which was beginning to encroach upon the southern portion of Okinawa Island.<\/p>\n

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RCM-3 SAR winds at 09:22:39 UTC on 01 August [click to enlarge]<\/p><\/div>ARCHER<\/strong><\/a> analysis using DMSP-16 SSMIS Microwave (85 GHz) imagery at 0848 UTC (below)<\/strong><\/em> displayed an arc of colder brightness temperatures (shades of orange) just east of the southern end of Okinawa Island.<\/p>\n

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ARCHER analysis using DMSP-16 SSMIS Microwave (85 GHz) imagery at 0848 UTC [click to enlarge]<\/p><\/div>A larger-scale animation of Himawari-9 Infrared images covering a longer period of time (below)<\/strong><\/em> revealed a small amount of trochoidal motion with the eye of Khanun — which is a behavior often seen with stronger tropical cyclones (for example, here<\/strong><\/a> and here<\/strong><\/a>).<\/p>\n

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JMA Himawari-9 \u201cClean\u201d Infrared Window (10.4 \u00b5m) images, from 2352 UTC on 31 July to 0222 UTC on 02 August [click to play animated GIF | MP4<\/strong><\/a>]\u00a0<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Target Sector\u00a0(2.5-minute interval)\u00a0JMA Himawari-9 AHI Visible and Infrared images (above) showed Category 4 Typhoon Khanun as it moved just south of Okinawa Island\u00a0 from 0502-1002 UTC on 01 August 2023. Visible images depicted mesovortces within the eye. During that 0502-1002 UTC time period, peak wind gusts at the 3 METAR sites located in the southern […]<\/p>\n","protected":false},"author":18,"featured_media":53788,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[56,73,79,104,25,2],"tags":[],"class_list":["post-53784","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dmsp","category-himawari-9","category-microwave","category-sar","category-satellite-winds","category-tropical-cyclones"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/53784","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/comments?post=53784"}],"version-history":[{"count":21,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/53784\/revisions"}],"predecessor-version":[{"id":53808,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/53784\/revisions\/53808"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/53788"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=53784"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=53784"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=53784"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}