{"id":52430,"date":"2023-05-21T09:41:00","date_gmt":"2023-05-21T09:41:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=52430"},"modified":"2023-05-22T13:43:35","modified_gmt":"2023-05-22T13:43:35","slug":"sar-winds-over-tropical-storm-mawar-to-the-southeast-of-guam","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/52430","title":{"rendered":"SAR Winds over Tropical Storm Mawar to the southeast of Guam"},"content":{"rendered":"\n
\"\"<\/a>
Himawari-9 Low-level water vapor (Band 10, 7.3 \u00b5m) imagery, 0800-0900 UTC on 21 May 2023 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

Himawari-9 Band 10 (Low-level water vapor, 7.3 \u00b5m) infrared imagery, above, shows Tropical Storm Mawar to the southeast of Guam. At 0600 UTC, Mawar’s center was about 400 miles south-southeast of the island of Guam. The short water vapor animation above shows an expanding cirrus shield with outflow in all directions. Mawar is expected to become a typhoon later today, and all interests in the southern Marianas islands (Guam and the CNMI are under a Typhoon Watch) should be monitoring the progress of this storm as it approaches.<\/p>\n\n\n\n

Canada’s RCM-2 (RADARSAT Constellation Mission-2) Satellite, carrying Synthetic Aperture Radar (SAR), overflew the system at 0813 UTC on 21 May. The toggle below compares Clean Window infrared imagery (Band 13, 10.4 \u00b5m) from Himawari-9 and the SAR wind analysis<\/a> at nearly the same time. SAR instantaneous winds are close to 70 knots (see this figure<\/a>, from here<\/a>). The SAR imagery does not show a closed-off eye. Himawari-9 shows very cold cloud tops to the west of the SAR-diagnosed surface center, with Band 13 Brightness temperatures close to -95o<\/sup>C. The parallax shift in the Himawari-9 imagery for very cold cloud tops near 148o<\/sup>E Longitude (Himawari-9 is over the Equator at 140.7o<\/sup>E<\/a>) will not be excessive; however, those coldest cloud tops are in reality a bit farther to the east.<\/p>\n\n\n\n

\"\"
Himawari-9 Clean Window (Band 13, 10.4 \u00b5m) infrared imagery overlain with RCM-2 SAR Wind Analysis, 0810 UTC, 21 May 2023 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n
\n\n\n

UPDATE<\/strong>: Mawar intensified to a Category 1 Typhoon at 1200 UTC (JTWC advisory<\/strong><\/a>) — 2.5-minute rapid scan JMA<\/strong><\/a> Himawari-9 “Clean” Infrared Window (10.4 \u00b5m) images (below)<\/strong><\/em> showed the cold overshooting tops that continued to exhibit infrared brightness temperatures in the -90 to -95\u00baC range.<\/p>\n

<\/a>

JMA Himawari-9 “Clean” Infrared Window (10.4 \u00b5m) images (courtesy Scott Bachmeier, CIMSS) [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>\n

Himawari-9 Infrared Window (11.2 \u00b5m) images with an overlay of deep-layer wind shear<\/strong><\/a> at 1200 UTC from the CIMSS Tropical Cyclones<\/strong><\/a> site (below)<\/strong><\/em> indicated that Mawar was moving through an environment of low shear — which, in addition to the storm traversing warm water (Sea Surface Temperature + Ocean Heat Content<\/strong><\/a>) favored a continuing trend of intensification.<\/p>\n

<\/a>

Himawari-9 Infrared Window (11.2 \u00b5m) images, with an overlay of deep-layer wind shear at 1200 UTC [click to enlarge]<\/p><\/div>\n\n\n

Interests in Guam and the CNMI (the southern Marianas Islands) should closely monitor the progress of Mawar. Refer to the Joint Typhoon Warning Center (Link<\/a>), the National Weather Service in Guam (Link<\/a>) and the Tokyo RSMC (Link<\/a>) for more information.<\/p>\n","protected":false},"excerpt":{"rendered":"

Himawari-9 Band 10 (Low-level water vapor, 7.3 \u00b5m) infrared imagery, above, shows Tropical Storm Mawar to the southeast of Guam. At 0600 UTC, Mawar’s center was about 400 miles south-southeast of the island of Guam. The short water vapor animation above shows an expanding cirrus shield with outflow in all directions. Mawar is expected to […]<\/p>\n","protected":false},"author":19,"featured_media":52434,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[73,104,25,2],"tags":[],"class_list":["post-52430","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-himawari-9","category-sar","category-satellite-winds","category-tropical-cyclones"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/52430","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=52430"}],"version-history":[{"count":5,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/52430\/revisions"}],"predecessor-version":[{"id":52457,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/52430\/revisions\/52457"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/52434"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=52430"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=52430"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=52430"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}