{"id":29747,"date":"2018-09-11T17:32:25","date_gmt":"2018-09-11T17:32:25","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=29747"},"modified":"2018-09-13T23:17:30","modified_gmt":"2018-09-13T23:17:30","slug":"hurricane-florence-on-11-september","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/29747","title":{"rendered":"Hurricane Florence continues to approach the southeastern US"},"content":{"rendered":"

\"GOES-16<\/a>

GOES-16 “Red” Visible (0.64 \u00b5m) <\/em>images [click to play MP4 animation]<\/p><\/div>Hurricane Florence<\/strong><\/a> maintained Category 4 intensity on the morning of 11 September 2018 — and 1-minute (initially 30-second, until 1345 UTC) Mesoscale Domain Sector<\/strong><\/a> GOES-16 (GOES-East)<\/em> “Red” Visible (0.64 \u00b5m<\/strong><\/a>) images (above)<\/strong><\/em> and “Clean” Infrared Window (10.3 \u00b5m<\/strong><\/a>) images (below)<\/strong><\/em> showed improving eye structure after the tropical cyclone completed an eyewall replacement cycle during the preceding nighttime hours (MIMIC TC<\/strong><\/a>). A distinct pattern of transverse banding was also evident within the northern semicircle of Florence on Infrared imagery.<\/p>\n

\"GOES-16<\/a>

GOES-16 “Clean” Infrared Window (10.3 \u00b5m)<\/em> images [click to play MP4 animation]<\/p><\/div>DMSP-18 SSMIS Microwave (85 GHz) imagery from the CIMSS Tropical Cyclones<\/strong><\/a> site (below)<\/strong><\/em> showed a large eye at 1015 UTC, and also at 1103 UTC<\/strong><\/a>.<\/p>\n

\"DMSP-18<\/a>

DMSP-18 SSMIS Microwave (85 GHz) <\/em>and GOES-16 “Clean” Infrared Window (10.3 \u00b5m)<\/em> images at 1015 UTC [click to enlarge]<\/p><\/div>GOES-16 Upper-level Water Vapor (6.2 \u00b5m<\/strong><\/a>) images with Derived Motion Winds (below)<\/strong><\/em> revealed that a well-defined high altitude outflow channel had developed northwest of Florence, helping the storm to maintain its intensity.<\/p>\n

\"GOES-16<\/a>

GOES-16 Upper-level Water Vapor (6.2 \u00b5m)<\/em> images, with Derived Motion Winds [click to play MP4 animation]<\/p><\/div>1-minute GOES-16 True Color Red-Green-Blue (RGB) images (courtesy of Kathy Strabala, CIMSS; details<\/strong><\/a>) are shown below. A larger-scale RGB animation beginning at sunrise is available here<\/strong><\/a> (courtesy of Rick Kohrs, SSEC).<\/p>\n

\"GOES-16<\/a>

1-minute GOES-16 True Color RGB images, 1330-1440 UTC [click to play MP4 animation]<\/p><\/div>Taking a closer look at the center of Florence later in the day, 1-minute GOES-16 data (below)<\/strong><\/em> showed mesovortices within the eye on Visible imagery, along with a narrow radial band of colder (darker red)<\/em> cloud-top infrared brightness temperatures about 30-50 miles from the inner edge of the eyewall.<\/p>\n

\"GOES-16<\/a>

GOES-16 “Red” Viisible (0.64 \u00b5m)<\/em> images [click to play MP4 animation]<\/p><\/div>

\"GOES-16<\/a>

GOES-16 “Clean” Infrared Window (10.3 \u00b5m)<\/em> images [click to play MP4 animation]<\/p><\/div><\/p>\n

===== 12 September Update =====<\/strong><\/p>\n

Florence remained at Category 4 intensity early in the day as it continued its northwestward motion toward the southeast coast of the US on 12 September<\/strong><\/a>. A 20-hour period of 1-minute GOES-16 Infrared images (from 0000-2015 UTC) is shown below.<\/p>\n

\"1-minute<\/a>

1-minute GOES-16 “Clean” Infrared Window (10.3 \u00b5m)<\/em> images, from 0000-2015 UTC [click to play MP4 animation]<\/p><\/div>Nighttime toggles between VIIRS Day\/Night Band (0.7 \u00b5m) and Infrared Window (11.45 \u00b5m) images from Suomi NPP and NOAA-20 are shown below (courtesy of William Straka, CIMSS). Bright lightning-illuminated cloud areas can be seen on the DNB images distant to the north and northwest of the storm center; with minimal illumination from the Moon (which was in the Waxing Crescent phase, at only 10% of Full),<\/em> Florence was illuminated primarily via airglow. On the Infrared images, a coarse pattern of transverse banding was evident along the far southern and western periphery of the storm.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS Day\/Night Band (0.7 \u00b5m)<\/em> and Infrared Window (11.45 \u00b5m)<\/em> images [click to enlarge]<\/p><\/div>

\"NOAA-20<\/a>

NOOA-20 VIIRS Day\/Night Band (0.7 \u00b5m)<\/em> and Infrared Window (11.45 \u00b5m)<\/em> images [click to enlarge]<\/p><\/div>A sequence of Terra\/Aqua MODIS and Suomi NPP VIIRS Infrared images (below)<\/strong><\/em> showed dramatic changes in the cold central dense overcast (CDO) of Florence between 02 and 18 UTC.<\/p>\n

\"Infrared<\/a>

Infrared Window images from Terra MODIS (11.0 \u00b5m) and Suomi NPP VIIRS (11.45 \u00b5m) [click to enlarge]<\/p><\/div>During the morning hours, 1-minute GOES-16 Visible and Infrared images (below)<\/strong><\/em> once again displayed a distinct eye and eyewall structure, with surface mesovortices evident within the eye. A curious linear standing wave — extending radially outward to the northeast of the storm center — developed from about 13-15 UTC (best seen on Infrared images).<\/p>\n

\"GOES-16<\/a>

GOES-16 “Red” Visible (0.64 \u00b5m)<\/em> images [click to play MP4 animation]<\/p><\/div>

\"GOES-16<\/a>

GOES-16 “Clean” Infrared Window (10.3 \u00b5m)<\/em> images [click to play MP4 animation]<\/p><\/div>ASCAT surface scatterometer winds from Metop-A (below)<\/strong><\/em> were as strong as 76 knots<\/strong><\/a> just northeast of the eye at 1450 UTC.<\/p>\n

\"GOES-16<\/a>

GOES-16 “Red” Visible (0.64 \u00b5m)<\/em> image with Metop-A ASCAT surface scatterometer winds [click to enlarge]<\/p><\/div>A stereoscopic animation using GOES-16 and GOES-17 imagery is shown below — to view in three dimensions, cross your eyes until 3 equal images are apparent, then focus on the image in the center. *Note: GOES-17 images shown here are preliminary and non-operational*<\/em><\/p>\n

\"Stereoscopic<\/a>

Stereoscopic animation using GOES-16 and GOES-17 “Red” Visible (0.64 \u00b5m)<\/em> imagery [click to play animation]<\/p><\/div>During the afternoon hours, GOES-16 Visible and Infrared images (below)<\/strong><\/em> showed that the eye presentation\u00a0 was beginning to deteriorate as Florence weakened to Category 3 intensity by 21 UTC.<\/p>\n

\"GOES-16<\/a>

GOES-16 “Red” Visible (0.64 \u00b5m)<\/em> images [click to play MP4 animation]<\/p><\/div>

\"GOES-16<\/a>

GOES-16 “Clean” Infrared Window {10.3 \u00b5m)<\/em> images [click to play MP4 animation]<\/p><\/div>The MIMIC Total Precipitable Water<\/strong><\/a> product (below)<\/strong><\/em> indicated that high TPW values associated with Florence began to move inland along the US East Coast by the end of the day.<\/p>\n

\"MIMIC<\/a>

MIMIC Total Precipitable Water product [click to enlarge]<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Hurricane Florence maintained Category 4 intensity on the morning of 11 September 2018 — and 1-minute (initially 30-second, until 1345 UTC) Mesoscale Domain Sector GOES-16 (GOES-East) “Red” Visible (0.64 \u00b5m) images (above) and “Clean” Infrared Window (10.3 \u00b5m) images (below) showed improving eye structure after the tropical cyclone completed an eyewall replacement cycle during the […]<\/p>\n","protected":false},"author":18,"featured_media":29752,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[70,56,74,80,58,79,12,45,25,49,71,2,48],"tags":[],"class_list":["post-29747","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aqua","category-dmsp","category-goes-16","category-goes-17","category-metop","category-microwave","category-modis","category-redgreenblue-rgb-images","category-satellite-winds","category-suomi_npp","category-terra","category-tropical-cyclones","category-viirs"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/29747","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\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/comments?post=29747"}],"version-history":[{"count":35,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/29747\/revisions"}],"predecessor-version":[{"id":29792,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/29747\/revisions\/29792"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/29752"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=29747"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=29747"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=29747"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}