![\"GOES-16](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/07\/210706_goes16_visible_infrared_Elsa_anim.gif\")
<\/a>GOES-16 \u201cRed\u201d Visible (0.64 \u00b5m)<\/em> and \u201cClean\u201d Infrared Window (10.35 \u00b5m)<\/em> images [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>Late in the day on 06 July 2021<\/strong><\/a>, Tropical Storm Elsa<\/strong><\/a> regained hurricane intensity as of 0000 UTC<\/strong><\/a>, just off the west coast of Florida.\u00a01-minute Mesoscale Domain Sector<\/strong><\/a>\u00a0GOES-16\u00a0(GOES-East)<\/em>\u00a0\u201cRed\u201d Visible (0.64 \u00b5m<\/strong><\/a>) and \u201cClean\u201d Infrared Window (10.35 \u00b5m<\/strong><\/a>) images\u00a0(above)\u00a0<\/strong><\/em>showed the tropical cyclone during the 1500 UTC to 0000 UTC time period. In the morning, cloud-top infrared brightness temperatures of -80\u00baC or colder were seen (violet pixels)<\/em>, but during most of the day they were in the -70 to -79\u00baC range. While Elsa had been moving over water with Sea Surface Temperature<\/strong><\/a> values around 28\u00baC, the Ocean Heat Content<\/strong><\/a> of those waters was relatively low.<\/p>\n For a few hours the low-level circulation of Elsa remained exposed from its deep convection to the northeast — and GOES-16 Visible images with an overlay of deep-layer shear<\/strong><\/a> at 1800 UTC, from the CIMSS Tropical Cyclones<\/strong><\/a> site (below)<\/strong><\/em>, showed that this was due to westerly shear values around 25-30 knots over the area.<\/p>\n GOES-16 \u201cRed\u201d Visible (0.64 \u00b5m)<\/em> images, with an overlay of deep-layer wind shear at 1800 UTC [click to enlarge]<\/p><\/div>The center of Elsa moved just to the east of Buoy 42023<\/strong><\/a> — a plot of wind speed\/gust and pressure is shown below.<\/p>\n Plot of wind speed\/gusts and pressure at Buoy 42023<\/p><\/div>\n A DMSP-15 Microwave (85 GHz) Microwave image at 2155 UTC (below)<\/strong><\/em>\u00a0indicated that Elsa had nearly completed the formation\u00a0 of a closed eyewall at that time.<\/p>\n DMSP-15 Microwave (85 GHz)<\/em> Microwave image at 2155 UTC [click to enlarge]<\/p><\/div>GOES-16 Infrared\u00a0 \/ Water Vapor Difference images (below)<\/strong><\/em> revealed pockets of stronger overshooting tops near the center of deep convection during the hours leading up to Elsa reaching hurricane intensity.<\/p>\n GOES-16 Infrared\u00a0 \/ Water Vapor Difference images [click to enlarge]<\/p><\/div>\n ===== 07 July Update =====<\/strong><\/p>\n GOES-16 \u201cRed\u201d Visible (0.64 \u00b5m)<\/em> and \u201cClean\u201d Infrared Window (10.35 \u00b5m)<\/em> images [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>After once again weakening to Tropical Storm intensity at 0600 UTC<\/strong><\/a>, Elsa eventually made landfall along the coast of Florida around 1500 UTC on 07 July, as seen in 1-minute GOES-16 Visible and Infrared images (above)<\/strong><\/em> — inland impacts included an EF0 tornado, wind gusts to 71 mph and rainfall exceeding 11 inches (NWS Public Information Statements<\/strong><\/a>).<\/p>\n At 1223 UTC, a DMSP-17 SSMIS Microwave image (below)<\/strong><\/em> indicated that a closed eyewall was not present with Elsa at that time.<\/p>\n<\/a><\/a><\/a><\/a><\/a>