{"id":51855,"date":"2023-04-21T16:10:50","date_gmt":"2023-04-21T16:10:50","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=51855"},"modified":"2023-04-21T16:10:50","modified_gmt":"2023-04-21T16:10:50","slug":"tropical-storm-sanvu-in-the-western-pacific","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/51855","title":{"rendered":"Tropical Storm Sanvu in the western Pacific"},"content":{"rendered":"\n<figure class=\"wp-block-video\"><video height=\"960\" style=\"aspect-ratio: 1440 \/ 960;\" width=\"1440\" controls loop src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/HIMAWARI-9_AHI_polartropicalairmass_20230417_1200_to_20230421_0000anim2.mp4\"><\/video><figcaption class=\"wp-element-caption\">Pacific Tropical Air Mass RGB, 1200 UTC on 17 April 2023 &#8211; 0000 UTC 21 April 2023<\/figcaption><\/figure>\n\n\n\n<p>The mp4 animation above shows the development of Tropical Storm Sanvu out of the Monsoon Trough in the western Pacific ocean on 19-20 April 2023.  The &#8216;Pacific Tropical Airmass RGB&#8217; used in the animation is described <a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/51777\">in this blog post<\/a>, and it gives more information about cloud-top features compared to the Airmass RGB (a similar mp4 animation for the airmass RGB is <a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/HIMAWARI-9_AHI_airmass_2023_0417_1200_to_0421_0000_Guam_anim.mp4\">here<\/a>).  An interesting (and suggestive) aspect of the animation is the development of strong outflow to the north of the Monsoon Trough after 18 April that continues through the end of the animation.  <\/p>\n\n\n\n<p>MIMIC Total Precipitable Water fields &#8212; that incorporate wind information from the GFS &#8212; also show the development of a circulation as the system develops.  Note that the storm is near the northern edge of the moist trough; the abundant dry air to its north might affect the future strength of the system.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/comp20230417_1000_to_0421_1200_tpw_anim.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"470\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/comp20230417_1000_to_0421_1200_tpw_anim.gif\" alt=\"\" class=\"wp-image-51858\"\/><\/a><figcaption class=\"wp-element-caption\">MIMIC Total Precipitable Water fields, 1000 UTC on 17 April through 1200 UTC on 21 April 2023 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<p>Gridded NUCAPS fields (<a href=\"https:\/\/weather.ndc.nasa.gov\/cgi-bin\/sportPublishData.pl?dataset=griddednucaps&amp;product=web10_QUAL.png&amp;stamp=20230419_0301&amp;loc=guam#image\">source<\/a>) can also give views of the environment that contains the developing tropical cyclone.  The three toggles below show the evolution from ca. 0300 UTC on 19 April through ca. 0230 UTC on 21 April 2023.  Mid-level Total (850-700mb) Precipitable Water, Relative Humidity at 700 mb, and the 850-700 mb Lapse Rate all testify to the hostile environment (dry and stable) to the north of this developing system.<\/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\/04\/20230419_0301_0420_0245_20230421_0224_gridded_nucaps_noaa20_guam_web17c_PWATmid_stepanim.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1192\" height=\"582\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/20230419_0301_0420_0245_20230421_0224_gridded_nucaps_noaa20_guam_web17c_PWATmid_stepanim.gif\" alt=\"\" class=\"wp-image-51869\"\/><\/a><figcaption class=\"wp-element-caption\">850-700 mb Precipitable Water diagnosed by gridded NUCAPS fields, ca. 0230-0300 UTC on 19, 20 and 21 April 2023 (click to enlarge)<\/figcaption><\/figure>\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\/04\/20230419_0301_0420_0245_20230421_0224_gridded_nucaps_noaa20_guam_web27_RH700mb_stepanim.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1207\" height=\"582\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/20230419_0301_0420_0245_20230421_0224_gridded_nucaps_noaa20_guam_web27_RH700mb_stepanim.gif\" alt=\"\" class=\"wp-image-51870\"\/><\/a><figcaption class=\"wp-element-caption\">700 mb Relative Humidity diagnosed by gridded NUCAPS fields, ca. 0230-0300 UTC on 19, 20 and 21 April 2023 (click to enlarge)<\/figcaption><\/figure>\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\/04\/20230419_0301_0420_0245_0421_0224_gridded_nucaps_noaa20_guam_web14b_LR850_stepanim.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1197\" height=\"582\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/20230419_0301_0420_0245_0421_0224_gridded_nucaps_noaa20_guam_web14b_LR850_stepanim.gif\" alt=\"\" class=\"wp-image-51871\"\/><\/a><figcaption class=\"wp-element-caption\">850-700 mb Lapse Rate diagnosed by gridded NUCAPS fields, ca. 0230-0300 UTC on 19, 20 and 21 April 2023 (click to enlarge)<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Diagnostics from the <a href=\"https:\/\/tropic.ssec.wisc.edu\">SSEC\/CIMSS Tropical Weather website<\/a> for the storm, below, show the system forecast to move towards a region where higher shear now exists.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1074\" height=\"699\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/SanvuPredictedTrack_1200_21April2023_step_path_shear_SST_IR-WV_anim.gif\" alt=\"\" class=\"wp-image-51876\"\/><figcaption class=\"wp-element-caption\">Predicted path of Sanvu, along with a 1200 UTC analysis of 200-850 mb wind shear and SSTs.  Also shown:  the 1420 UTC image of WV-IR brightness temperature differences, used to diagnose regions of overshooting tops (red to very dark red in the enhancement)<\/figcaption><\/figure>\n\n\n\n<p> <\/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\/04\/SANVU_SATCON_202301W_wind.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"536\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/SANVU_SATCON_202301W_wind-1024x536.png\" alt=\"\" class=\"wp-image-51879\" srcset=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/SANVU_SATCON_202301W_wind-1024x536.png 1024w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/SANVU_SATCON_202301W_wind-300x157.png 300w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/SANVU_SATCON_202301W_wind-768x402.png 768w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/SANVU_SATCON_202301W_wind-1536x804.png 1536w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/SANVU_SATCON_202301W_wind-2048x1072.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">SATCON analysis of peak winds with Sanvu, 19 April through 21 April 2023 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<p><a href=\"https:\/\/tropic.ssec.wisc.edu\/real-time\/satcon\/\">SATCON diagnostics from CIMSS<\/a>, above, show that an initial period of strengthening has leveled off.The forecast from the <a href=\"https:\/\/www.metoc.navy.mil\/jtwc\/jtwc.html\">Joint Typhoon Warning Center<\/a> takes Sanvu towards the southern Marianas islands as a system with weak winds (but likely abundant moisture), as shown below.<\/p>\n\n\n\n<p>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"594\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/JTWC_Prediction_from1200UTC_21April2023-1024x594.gif\" alt=\"\" class=\"wp-image-51880\" srcset=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/JTWC_Prediction_from1200UTC_21April2023-1024x594.gif 1024w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/JTWC_Prediction_from1200UTC_21April2023-300x174.gif 300w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/JTWC_Prediction_from1200UTC_21April2023-768x446.gif 768w, https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2023\/04\/JTWC_Prediction_from1200UTC_21April2023-1536x891.gif 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Predicted path of Sanvu, 1200 UTC on 21 April through 1200 UTC on 25 April, 2023 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>More information on this system is available at the webpages of the National Weather Service in Guam (<a href=\"https:\/\/www.weather.gov\/gum\/\">link<\/a>).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The mp4 animation above shows the development of Tropical Storm Sanvu out of the Monsoon Trough in the western Pacific ocean on 19-20 April 2023. The &#8216;Pacific Tropical Airmass RGB&#8217; used in the animation is described in this blog post, and it gives more information about cloud-top features compared to the Airmass RGB (a similar [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":51877,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[73,79,78,83,2],"tags":[],"class_list":["post-51855","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-himawari-9","category-microwave","category-noaa-20","category-nucaps","category-tropical-cyclones"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/51855","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=51855"}],"version-history":[{"count":4,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/51855\/revisions"}],"predecessor-version":[{"id":51883,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/51855\/revisions\/51883"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/51877"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=51855"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=51855"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=51855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}