{"id":53773,"date":"2023-08-02T05:45:00","date_gmt":"2023-08-02T05:45:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=53773"},"modified":"2023-08-02T17:46:59","modified_gmt":"2023-08-02T17:46:59","slug":"western-pacific-itcz-changes-from-24-july-to-2-august-2023","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/53773","title":{"rendered":"Western Pacific ITCZ changes from 24 July to 2 August 2023"},"content":{"rendered":"\n<figure class=\"wp-block-video\"><video height=\"470\" style=\"aspect-ratio: 1000 \/ 470;\" width=\"1000\" controls loop src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/comp20230724.00_to_0802.00_tpw_anim.mp4\"><\/video><figcaption class=\"wp-element-caption\">MIMIC Total Precipitable Water, 0000 UTC 24 July &#8211; 0000 UTC 2 August 2023 <\/figcaption><\/figure>\n\n\n\n<p>Hourly estimates of Total Precipitable Water (TPW) from <a href=\"http:\/\/tropic.ssec.wisc.edu\/real-time\/mtpw2\/product.php?color_type=tpw_nrl_colors&amp;prod=wpac&amp;timespan=24hrs&amp;anim=html5\">MIMIC<\/a>, shown above in an mp4 animation (click <a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/comp20230724.00_to_0802.00_tpw_anim.gif\">here<\/a> for an animated gif), show the Intertropical Convergence Zone (ITCZ, as measured by TPW) over the western Pacific evolving from a linear feature at the start of the animation to one with a significant break near 140<sup>o<\/sup>E &#8211; 150<sup>o<\/sup>E longitude.  This has occurred as Typhoons <a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/53709\">Doksuri<\/a> (moving between the Philippines and Taiwan at the start of the animation) and Khanun (moving south of Japan at the end of the animation) have developed (<a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/53656\">here is a blog post<\/a> on the formation of Khanun).  Formation of tropical cyclones during the breakdown of the ITCZ is not uncommon (as noted, for example, <a href=\"http:\/\/schubert.atmos.colostate.edu\/publications\/refereed\/guinnandschubert1993_spiralbands.pdf\">here<\/a>, and <a href=\"https:\/\/journals.ametsoc.org\/view\/journals\/atsc\/54\/2\/1520-0469_1997_054_0261_baoib_2.0.co_2.xml\">here<\/a>).  The mp4 animation below (click <a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/TwoPanelWV-20230724_0000_to_20230802_0000_step_03h.gif\">here<\/a> for an animated gif) tracks the Upper- and Lower-level water vapor infrared imagery (Himawari-9 Bands 8 and 10 at 6.24 \u00b5m and 7.3 \u00b5m, respectively) over the same time period.<\/p>\n\n\n\n<figure class=\"wp-block-video\"><video height=\"854\" style=\"aspect-ratio: 1312 \/ 854;\" width=\"1312\" controls loop src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/TwoPanelWV-20230724_0000_to_20230802_0000_step_03h.mp4\"><\/video><figcaption class=\"wp-element-caption\">Himawari-9 Band 8 (top, 6.24 \u00b5m) and Band 10 (bottom, 7.3 \u00b5m) infrared imagery, 0000 UTC 24 July &#8211; 0000 UTC 02 August 2023 with 3-hour timesteps<\/figcaption><\/figure>\n\n\n\n<p>Himawari-9 Clean Window imagery, below, at 0000 UTC on 24 July (left) and 2 August (right) show little in the way of ITCZ convection between the Equator and 20<sup>o<\/sup>N on 2 August, especially compared to 24 July, over the western Pacific.  ITCZ convection does persist to the east of 160<sup>o<\/sup>E longitude.  MIMIC TPW fields at those two times (<a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/comp20230724_0802.0000_top_bottom.png\">here<\/a>) also show a similar rearrangement of convective centers.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/H9Band13-20230724_0802_0000_sidebyside.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"334\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/H9Band13-20230724_0802_0000_sidebyside-1024x334.gif\" alt=\"\" class=\"wp-image-53780\" srcset=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/H9Band13-20230724_0802_0000_sidebyside-1024x334.gif 1024w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/H9Band13-20230724_0802_0000_sidebyside-300x98.gif 300w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/H9Band13-20230724_0802_0000_sidebyside-768x251.gif 768w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/H9Band13-20230724_0802_0000_sidebyside-1536x501.gif 1536w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/H9Band13-20230724_0802_0000_sidebyside-2048x668.gif 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">Himawawri-9 Clean WIndow (Band 13, 10.4 \u00b5m) infrared imagery, 0000 UTC on 24 July (left) and 2 August 2023 (right)  (Click to enlarge)<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Hourly estimates of Total Precipitable Water (TPW) from MIMIC, shown above in an mp4 animation (click here for an animated gif), show the Intertropical Convergence Zone (ITCZ, as measured by TPW) over the western Pacific evolving from a linear feature at the start of the animation to one with a significant break near 140oE &#8211; [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":53779,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[73,2],"tags":[],"class_list":["post-53773","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\/53773","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\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/comments?post=53773"}],"version-history":[{"count":3,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/53773\/revisions"}],"predecessor-version":[{"id":53782,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/53773\/revisions\/53782"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/53779"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=53773"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=53773"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=53773"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}