{"id":54060,"date":"2023-08-21T13:54:00","date_gmt":"2023-08-21T13:54:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=54060"},"modified":"2023-08-22T13:31:53","modified_gmt":"2023-08-22T13:31:53","slug":"isolated-ascat-wind-maxima-and-himawari-9-imagery","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/54060","title":{"rendered":"Isolated ASCAT wind maxima and Himawari-9 imagery"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/ASCATB_1041_1128annot_21August2023stepanim.gif\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/ASCATB_1041_1128annot_21August2023stepanim.gif\" alt=\"\" class=\"wp-image-54066\" style=\"width:1086px;height:720px\" width=\"1086\" height=\"720\"\/><\/a><figcaption class=\"wp-element-caption\">Metop C (1041 UTC) and Metop B (1128 UTC ) Advanced Scatterometry (ASCAT) winds, 21 August 2023 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Metop-B and Merop-C overflew the same region of the tropical western Pacific to the east of Guam on 21 August 2023, as shown above (imagery dowloaded from the <a href=\"https:\/\/manati.star.nesdis.noaa.gov\/datasets\/ASCATBData.php\">&#8216;manati&#8217; website<\/a>).  Metop-C imagery is from 1041 UTC, Metop-B from 1128 UTC.  There are two wind maxima in both plots, centered near 13<sup>o<\/sup>N, 156<sup>o<\/sup>E and near 18<sup>o<\/sup>N, 155<sup>o<\/sup>E, and highlighted by the blue arrows in the toggle above.  What can you infer from just these plots?  The stronger winds are likely associated with convection, and the convection near 18<sup>o<\/sup>N (the northern convection, vs. the southern convection near 13<sup>o<\/sup>N) might be more long-lasting, given its proximity to the shear line (denoted by the red line in the toggle).  The 1030 UTC image, below, shows the deep convection associated with these wind events. <\/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\/ASCATC_Himawari9_Band13_1030UTC.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/ASCATC_Himawari9_Band13_1030UTC-1024x576.png\" alt=\"\" class=\"wp-image-54067\" srcset=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/ASCATC_Himawari9_Band13_1030UTC-1024x576.png 1024w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/ASCATC_Himawari9_Band13_1030UTC-300x169.png 300w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/ASCATC_Himawari9_Band13_1030UTC-768x432.png 768w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/ASCATC_Himawari9_Band13_1030UTC.png 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">Metop-C ASCAT winds at 1041 UTC, and 1030 UTC Himawari-9 Clean Window infrared imagery (Band 13, 10.4 \u00b5m), 1030 UTC on 21 August 2023 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Does the southern convection seems less long-lived than the northern convection?  Hard to tell from just this two-plus-hour animation below.<\/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\/H9Band13-20230821_1000_to_1230_by30step.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1229\" height=\"857\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/H9Band13-20230821_1000_to_1230_by30step.gif\" alt=\"\" class=\"wp-image-54068\"\/><\/a><figcaption class=\"wp-element-caption\">Himawari-9 Clean Window infrared imagery (Band 13, 10.4 \u00b5m), 1000 &#8211; 1230 UTC (every 30 minutes), (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Himawari-9 imagery from the Pacific Island 1 sector <a href=\"https:\/\/www.data.jma.go.jp\/mscweb\/data\/himawari\/\">at this website<\/a>, from 21 August 2023, below, does show persistent convection near the shear line (the invest 90W according to <a href=\"https:\/\/www.metoc.navy.mil\/jtwc\/jtwc.html\">JTWC<\/a>);  the southern convection is not as long-lived. <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"701\" height=\"601\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/08\/pil_snd_0000_to_2350_21Augustu2023anim.gif\" alt=\"\" class=\"wp-image-54072\"\/><figcaption class=\"wp-element-caption\">Himawari-9 Sandwich imagery (combined Band 2, 0.64 \u00b5m and Band 13, 10.4 \u00b5m), 0000 &#8211; 2350 UTC, 21 August 2023 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">The best way to interpret a single satellite data source is to incorporate other satellite data into the analysis!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Metop-B and Merop-C overflew the same region of the tropical western Pacific to the east of Guam on 21 August 2023, as shown above (imagery dowloaded from the &#8216;manati&#8217; website). Metop-C imagery is from 1041 UTC, Metop-B from 1128 UTC. There are two wind maxima in both plots, centered near 13oN, 156oE and near 18oN, [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":54067,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10,73,58,25],"tags":[],"class_list":["post-54060","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general-interpretation","category-himawari-9","category-metop","category-satellite-winds"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/54060","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=54060"}],"version-history":[{"count":5,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/54060\/revisions"}],"predecessor-version":[{"id":54075,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/54060\/revisions\/54075"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/54067"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=54060"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=54060"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=54060"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}