{"id":55066,"date":"2023-10-11T12:25:00","date_gmt":"2023-10-11T12:25:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=55066"},"modified":"2023-10-11T15:48:05","modified_gmt":"2023-10-11T15:48:05","slug":"sar-wind-observations-over-super-typhoon-bolaven","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/55066","title":{"rendered":"SAR wind observations over Super Typhoon Bolaven"},"content":{"rendered":"\n

The RCM-1 (Radarsat Constellation Mission 1) satellite overflew STY Bolaven at 0840 UTC on 11 October. The Himawari-9 infrared (10.4 \u00b5m) presentation of the storm is excellent with a symmetric storm, distinct eye, and vigorous outer band convection. SAR winds show the strongest convection in the eastern half of the eyewall, where winds of 80 m\/s (> 150 knots) are measured. (This website<\/a> contains views of Bolaven from multiple SAR overpasses) The structure of the SAR winds (here<\/a>‘s a zoomed-in view) shows a band of weaker winds outside the strongest winds on the east side of the storm. Is an eyewall replacement cycle occurring?<\/p>\n\n\n\n

\"\"<\/a>
Himawari-9 Clean Window (Band 13, 10.4 \u00b5m) imagery, RCM-1 SAR Wind analyses, 0840 UTC on 11 October 2023 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

The SSEC\/CIMSS Tropical Weather website<\/a> includes a section on Microwave-based Probabilities of an Eyewall Replacement Cycle (M-PERC)<\/a>. The diagram below (click on it to see the entire figure including column headers) shows probabilities reached a maximum after 0300 on 11 October. <\/p>\n\n\n\n

\"\"<\/a>
Microwave-based estimates of a Ring Score, Probability of an Eyewall Replacement, and Maximum winds (Click to view the entire diagram)<\/figcaption><\/figure>\n\n\n\n

The MIMIC-TC animation below, however, shows winds consistently at\/above 145 knots in the latter part of the animation, and no obvious signature of an ongoing eyewall replacement.<\/p>\n\n\n\n

\"\"
MIMIC-TC over Bolaven, 0000 – 0945 UTC, 11 October 2023 (click to enlarge)<\/figcaption><\/figure>\n\n\n\n

For more information on this storm, refer to the webpages of the Joint Typhoon Warning Center<\/a>, the RSMC in Tokyo<\/a> and the CIMSS Tropical Website<\/a>. Bolaven is forecast to remain at sea as it recurves to the north and east. It is forecast to become a significant mid-latitude extra-tropical cyclone in the Gulf of Alaska by 18 October.<\/p>\n","protected":false},"excerpt":{"rendered":"

The RCM-1 (Radarsat Constellation Mission 1) satellite overflew STY Bolaven at 0840 UTC on 11 October. The Himawari-9 infrared (10.4 \u00b5m) presentation of the storm is excellent with a symmetric storm, distinct eye, and vigorous outer band convection. SAR winds show the strongest convection in the eastern half of the eyewall, where winds of 80 […]<\/p>\n","protected":false},"author":19,"featured_media":55068,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[73,25,2],"tags":[],"class_list":["post-55066","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-himawari-9","category-satellite-winds","category-tropical-cyclones"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/55066","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=55066"}],"version-history":[{"count":3,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/55066\/revisions"}],"predecessor-version":[{"id":55078,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/55066\/revisions\/55078"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/55068"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=55066"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=55066"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=55066"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}