![\"JMA](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/04\/210416_himawari8_infrared_Typhoon_Surigae_anim.gif\")
<\/a>JMA Himawari-8 Infrared Window (10.4 \u00b5m)<\/em> images [click to play animation]<\/p><\/div>2.5-minute interval rapid scan\u00a0JMA<\/strong><\/a>\u00a0Himawari-8 Infrared Window (10.4 \u00b5m) images\u00a0(above)<\/strong><\/em> showed Typhoon Surigae undergoing rapid intensification (ADT<\/strong><\/a> | SATCON<\/strong><\/a>) to become a Category 4 storm as of 18 UTC on 16 April 2021.<\/p>\n A DMSP-16 SSMIS Microwave (85 GHz) image from the CIMSS Tropical Cyclones<\/strong><\/a> site (below)<\/strong><\/em> displayed a well-defined eye, with distinct spiral bands feeding into the eyewall.<\/p>\n DMSP-16 SSMIS Microwave (85 GHz)<\/em> image at 1944 UTC [click to enlarge]<\/p><\/div>After sunrise, Himawari-8 “Red” Visible (0.64 \u00b5m) images (below)<\/strong><\/em> showed the relatively compact eye, with hints of low-level mesovortices within the eye.<\/p>\n JMA Himawari-8 “Red” Visible (0.64 \u00b5m)<\/em> images [click to play animation]<\/p><\/div>\n ===== 17 April Update =====<\/strong><\/p>\n JMA Himawari-8 Infrared Window (10.4 \u00b5m) images [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>The prolonged period of rapid intensification continued overnight, and as of 12 UTC on 17 April Surigae had become a Category 5 Super Typhoon — 2.5-minute interval rapid scan Himawari-8 Infrared images (above)<\/strong><\/em> showed the well-defined eye as the storm tracked northwestward across the Philippine Sea (just east of the Philippines). A faster animation (GIF<\/strong><\/a> | MP4<\/strong><\/a>) helped to highlight the trochoidal motion (wobble) of the eye — a behavior often seen with intense tropical cyclones. The 21 UTC advisory<\/strong><\/a> from JTWC<\/strong><\/a> listed sustained winds of 165 knots (and objective intensity estimates from ADT<\/strong><\/a> and SATCON<\/strong><\/a> were around 170 knots), making Surigae the only tropical cyclone on record to reach that intensity during the month of April. Year and date of all 165kt tropical cyclones on record around the world. pic.twitter.com\/JLUwjceapf<\/a><\/p>\n \u2014 Sam Lillo (@splillo) April 17, 2021<\/a><\/p><\/blockquote>\n<\/a><\/a><\/a>
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![GIF<\/strong><\/a> | MP4<\/strong><\/a>) helped to highlight the trochoidal motion (wobble) of the eye — a behavior often seen with intense tropical cyclones. The 21 UTC advisory<\/strong><\/a> from JTWC<\/strong><\/a> listed sustained winds of 165 knots (and objective intensity estimates from ADT<\/strong><\/a> and SATCON<\/strong><\/a> were around 170 knots), making Surigae the only tropical cyclone on record to reach that intensity during the month of April.\n<\/p>\n\nYear and date of all 165kt tropical cyclones on record around the world. pic.twitter.com\/JLUwjceapf<\/a><\/p>\n\u2014 Sam Lillo (@splillo) April 17, 2021<\/a><\/p><\/blockquote>\n](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/04\/210417_himawari8_infrared_Typhoon_Surigae_2_anim.gif\"){kind=link}
![ADT<\/strong><\/a> and SATCON<\/strong><\/a> were around 170 knots), making Surigae the only tropical cyclone on record to reach that intensity during the month of April.\n<\/p>\n\nYear and date of all 165kt tropical cyclones on record around the world. pic.twitter.com\/JLUwjceapf<\/a><\/p>\n\u2014 Sam Lillo (@splillo) April 17, 2021<\/a><\/p><\/blockquote>\n](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/04\/210417_adt_Surigae.gif\"){kind=link}
![SATCON<\/strong><\/a> were around 170 knots), making Surigae the only tropical cyclone on record to reach that intensity during the month of April.\n<\/p>\n\nYear and date of all 165kt tropical cyclones on record around the world. pic.twitter.com\/JLUwjceapf<\/a><\/p>\n\u2014 Sam Lillo (@splillo) April 17, 2021<\/a><\/p><\/blockquote>\n](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/04\/210417_satcon_Surigae.png\"){kind=link}