{"id":55013,"date":"2023-10-10T00:59:00","date_gmt":"2023-10-10T00:59:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=55013"},"modified":"2023-10-11T14:32:42","modified_gmt":"2023-10-11T14:32:42","slug":"bolaven-becomes-a-typhoon","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/55013","title":{"rendered":"Bolaven becomes a typhoon"},"content":{"rendered":"

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JMA Himawari-9 Clean Infrared Window (10.4 \u00b5m) images, from 2012 UTC on 09 October to 0752 UTC on 10 October [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>Target Sector<\/strong><\/a>\u00a0(2.5-minute interval)\u00a0JMA<\/strong><\/a>\u00a0Himawari-9\u00a0AHI<\/strong><\/a>\u00a0Clean Infrared Window (10.4 \u00b5m) images\u00a0(above)<\/strong><\/em> and Red Visible (0.64 \u00b5m) mages (below)<\/strong><\/em> showed Tropical Storm Bolaven as it intensified to become a Category 1 Typhoon just southeast of the Mariana Islands<\/strong><\/a> at 0000 UTC (SATCON<\/strong><\/a> | JTWC advisory<\/strong><\/a>) on 10 October 2023. The coldest cloud-top infrared brightness temperatures, associated with brief vortical hot towers<\/strong><\/a> within the Central Dense Overcast of Bolaven, were around -90\u00baC (yellow pixels embedded within dark purple areas).<\/p>\n

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JMA Himawari-9 Red Visible (0.64 \u00b5m) images, from 2012 UTC on 09 October to 0752 UTC on 10 October [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>
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JMA Himawari-9 Red Visible (0.64 \u00b5m) and Clean Infrared Window (10.4 \u00b5m) images at 0322 UTC on 10 October [click to enlarge]<\/p><\/div>One of the more notable vortical hot towers (VHTs) occurred just southeast of the island of Rota<\/strong><\/a> at 0322 UTC on 10 October, as seen in a toggle between Himawari-9 Red Visible (0.64 \u00b5m) and Clean Infrared Window (10.4 \u00b5m) images (above)<\/strong><\/em>. The coldest infrared brightness temperature within the VHT cluster of yellow pixels was -94\u00baC; that temperature represented a significant air parcel overshoot of the local tropopause — which was -81.9\u00baC at 106 hPa, as seen in a plot of 0000 UTC rawinsonde data from Guam (below)<\/strong><\/em>. On a side note, the Total Precipitable Water (PW) value of 2.74 in<\/strong> analyzed from that sounding was a record high value<\/strong><\/a> for 0000 UTC soundings on 10 October (the previous record was 2.61 in).<\/p>\n

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Plot of rawinsonde data from Guam at 0000 UTC on 10 October [click to enlarge]<\/p><\/div>Himawari-9 Infrared Window (11.2 \u00b5m) images from the CIMSS Tropical Cyclones<\/strong><\/a>\u00a0site\u00a0(below)<\/strong><\/em> showed that Bolaven was moving through an environment of low deep-layer wind shear<\/strong><\/a> \u2014 which, in addition to its motion across warm water (SST<\/strong><\/a> | OHC<\/strong><\/a>), favored continued intensification.<\/p>\n

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JMA Himawari9 Infrared Window (11.2 \u00b5m) images, with an overlay of deep-layer wind shear at 0000 UTC [click to enlarge]<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Target Sector\u00a0(2.5-minute interval)\u00a0JMA\u00a0Himawari-9\u00a0AHI\u00a0Clean Infrared Window (10.4 \u00b5m) images\u00a0(above) and Red Visible (0.64 \u00b5m) mages (below) showed Tropical Storm Bolaven as it intensified to become a Category 1 Typhoon just southeast of the Mariana Islands at 0000 UTC (SATCON | JTWC advisory) on 10 October 2023. The coldest cloud-top infrared brightness temperatures, associated with brief vortical […]<\/p>\n","protected":false},"author":18,"featured_media":55015,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[73,2],"tags":[],"class_list":["post-55013","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-himawari-9","category-tropical-cyclones"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/55013","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=55013"}],"version-history":[{"count":19,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/55013\/revisions"}],"predecessor-version":[{"id":55065,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/55013\/revisions\/55065"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/55015"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=55013"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=55013"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=55013"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}