{"id":29936,"date":"2018-09-24T23:59:13","date_gmt":"2018-09-24T23:59:13","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=29936"},"modified":"2018-09-26T13:59:55","modified_gmt":"2018-09-26T13:59:55","slug":"west-pacific-super-typhoon-trami","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/29936","title":{"rendered":"West Pacific Super Typhoon Trami"},"content":{"rendered":"

\"Himawari-8<\/a>

Himawari-8 “Clean” Infrared Window (10.4 \u00b5m)<\/em> images [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>Himawari-8 “Clean” Infrared Window (10.4 \u00b5m) images (above)<\/strong><\/em> showed Typhoon Trami at Category 4 intensity during the 23-24 September 2018 period. The typhoon was going through an eyewall replacement cycle during this time — as seen on the MIMIC-TC product<\/strong><\/a> — which halted the period of rapid intensification that began early on 23 September (ADT<\/strong><\/a> | SATCON<\/strong><\/a>). Note the significant trochoidal motion (wobble) of the storm during the first half of the animation.<\/p>\n

With the arrival of daylight late on 24 September UTC (25 September local time), the satellite presentation of then Category 5 Trami was quite striking, with surface mesovorticies within the large eye seen on both Visible and Infrared rapid-scan (2.5-minute interval) images (below)<\/strong><\/em>. The deep-layer mean steering flow was also very light, allowing the forward motion of Trami to slow considerably.<\/p>\n

\"Himawari-8<\/a>

Himawari-8 “Red” Visible (0.64 \u00b5m, left)<\/em> and “Clean” Infrared Window (10.4 \u00b5m, right)<\/em> images [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>Trami was in an environment characterized by low values of deep-layer wind shear<\/strong><\/a>, as shown in an animation of Himawari-8 Infrared Window (10.4 \u00b5m) images from the CIMSS Tropical Ctclones<\/strong><\/a> site (below)<\/strong><\/em>.<\/p>\n

\"Himawari-8<\/a>

Himawari-8 Infrared Window (10.4 \u00b5m) images, with deep-layer wind shear analysis at 00 UTC [click to enlarge]<\/p><\/div>After nightfall on 25 September, and overpass of NOAA-20 provided VIIRS Day\/Night Band (0.7 \u00b5m) and Infrared Window (11.45 \u00b5m) images of Trami at 1634 UTC (below; <\/strong>courtesy of William Straka, CIMSS)<\/strong><\/em>. Due to the very slow motion of the typhoon, strong winds had induced upwelling of cooler water from below the ocean surface — which in turn brought a gradual weakening of the storm to a Category 4 intensity. Ample illumination from a Full Moon demonstrated the “visible image at night” capability of the Day\/Night Band.<\/p>\n

\"NOAA-20<\/a>

NOAA-20 VIIRS Day\/Night Band (0.7 \u00b5m)<\/em> and Infrared Window (11.45 \u00b5m)<\/em> images [click to enlarge]<\/p><\/div>
\nThough the eye had become more cloud-filled, distinct surface mesovortices were still present — captured in stunning detail by an astronaut on the International Space Station:
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As if somebody pulled the planet's gigantic plug. Staring down the eye of yet another fierce storm. Category 5 Super Typhoon Trami is unstoppable and heading for Japan and Taiwan. Be safe down there! #TyphoonTrami<\/a> pic.twitter.com\/4VmY2hhj2c<\/a><\/p>\n

— Alexander Gerst (@Astro_Alex) September 25, 2018<\/a><\/p><\/blockquote>\n