![](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2024\/01\/240120_himawari9_infrared_Invest90P_anim.gif\")
<\/a>JMA Himawari-9 Clean Infrared Window (10.4 \u00b5m) images, from 0602 UTC to 2342 UTC on 20 January [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>Target Sector<\/strong><\/a>\u00a0(2.5-minute interval)\u00a0JMA<\/strong><\/a>\u00a0Himawari-9\u00a0AHI<\/strong><\/a>\u00a0Clean Infrared Window (10.4 \u00b5m) images\u00a0(above)<\/strong><\/em> showed Tropical Invest 90P as it moved westward across the Coral Sea on 20 January 2024. Intermittent convective bursts within the growing cold cloud canopy contained multiple overshooting tops that exhibited infrared brightness temperatures of -100\u00baC or colder (internal clusters of red pixels embedded within yellow-to-black regions). In fact, the minimum infrared brightness temperature of -103.83\u00baC on the 17:09:44 UTC<\/strong><\/a> image was colder than the -103.55\u00baC measured by Himawari-8 with Typhoon Kammuri<\/strong><\/a> in 2019 (which at that time was thought to be the coldest cloud-top infrared brightness temperature on record as sensed by a geostationary satellite).<\/p>\n Himawari-9 Infrared Window (11.2 \u00b5m) images from the CIMSS Tropical Cyclones<\/strong><\/a>\u00a0site\u00a0(below)<\/strong><\/em> showed that Invest 90P was moving through an environment of high deep-layer wind shear<\/strong><\/a> \u2014 which was inhibiting its further intensification.<\/p>\n