{"id":65558,"date":"2025-06-26T20:16:23","date_gmt":"2025-06-26T20:16:23","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=65558"},"modified":"2025-06-26T20:18:18","modified_gmt":"2025-06-26T20:18:18","slug":"active-monsoon-trough-over-the-western-pacific","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/65558","title":{"rendered":"Active Monsoon trough over the western Pacific"},"content":{"rendered":"\n
\"\"<\/a>
Total Precipitable Water estimates, 1600 UTC 25 June – 1500 UTC 26 June 2025 (click to enlarge)<\/figcaption><\/figure>\n\n\n\n

Total Precipitable Water (TPW) fields across the western Pacific (source<\/a>), show a band of abundant moisture between 10o<\/sup> and 20o<\/sup> N latitude. In addition, the remnants of Sepat<\/a> are moving to the north and east of Japan, and a tropical depression<\/a> is making landfall over China to the north of Hainan Island. Do you expect tropical cyclogenesis from the rotation apparent in the MIMIC TPW fields centered near 138o<\/sup>E and 15o<\/sup>N?<\/p>\n\n\n\n

Scatterometry data from MetopB and OSCAT, below (from here<\/a>, and here<\/a>, respectively) shows a circulation moving to the west, from about 141o<\/sup>E to 139o<\/sup>E in 12 hours.<\/p>\n\n\n\n

\"\"<\/a>
ASCAT data from Metop-B at 2318 UTC on 25 June 2025 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n
\"\"<\/a>
OSCAT Scatterometery at 1330 UTC on 26 June 2025 (click to enlarge)<\/figcaption><\/figure>\n\n\n\n

NOAA-21 overflew Guam around 0345 UTC on 26 June, and the direct broadcast antenna at the NWS forecast office<\/a> there acquired data used to create the images (created with CSPP software<\/a>) below. ATMS rain rate data shows concentrated convection under a region of active convection to the west of Guam; parallel lines of convection are east and north of Guam.<\/p>\n\n\n\n

\"\"<\/a>
NOAA-21 True Color imagery (from VIIRS) and Rain Rate (from ATMS), 0345 UTC on 26 June 2025 (click to enlarge)<\/figcaption><\/figure>\n\n\n\n

Himawari-9 imagery (more-or-less centered on Guam), below, shows a region of convection associated with the circulation detected by scatterometry. (There are many other interesting features in this animation too!)<\/p>\n\n\n\n

\"\"<\/a>
Himawari-9 Clean Window (Band 13, 10.4) infrared imagery, 0000-1500 UTC on 26 June 2025 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

Mid-level water vapor imagery shows now distinct regions of mid-level dry air that could act to impede development of this system.<\/p>\n\n\n\n

\"\"<\/a>
Himawari-9 Mid-Level Water vapor (Band 9, 6.95) infrared imagery, 0000-1500 UTC on 26 June 2025 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

The Joint Typhoon Weather Center (JTWC) show this system as an invest (#97W). Imagery from this site shows the system in a narrow region of low shear.<\/p>\n\n\n\n

\"\"<\/a>
850-mb vorticity, Upper Level Divergence and 200-850 mb shear, 1800 UTC on 26 June 2025 (click to enlarge)<\/figcaption><\/figure>\n\n\n\n

Refer to the webpages of the Joint Typhoon Warning Center<\/a> and JMA<\/a> for more information on this system.<\/p>\n","protected":false},"excerpt":{"rendered":"

Total Precipitable Water (TPW) fields across the western Pacific (source), show a band of abundant moisture between 10o and 20o N latitude. In addition, the remnants of Sepat are moving to the north and east of Japan, and a tropical depression is making landfall over China to the north of Hainan Island. Do you expect […]<\/p>\n","protected":false},"author":19,"featured_media":65573,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[73,58,131,25,2],"tags":[],"class_list":["post-65558","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-himawari-9","category-metop","category-noaa-21","category-satellite-winds","category-tropical-cyclones"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/65558","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=65558"}],"version-history":[{"count":5,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/65558\/revisions"}],"predecessor-version":[{"id":65574,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/65558\/revisions\/65574"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/65573"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=65558"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=65558"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=65558"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}