![](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2023\/08\/230830_goes16_visible_infrared_glmFlashExtentDensity_Hurricane_Idalia_landfall_anim.gif\")
<\/a>30-second GOES-16 “Red” Visible (0.64 \u00b5m, top) and \u201cClean\u201d Infrared Window (10.3 \u00b5m, bottom) images (with\/without an overlay of GLM Flash Extent Density) from 1000-1300 UTC, which include plots of 15-minute METAR surface reports (cyan) and hourly Fixed Buoy reports (green) [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>Overlapping 1-minute Mesoscale Domain Sectors<\/strong><\/a> provided 30-second GOES-16 (GOES-East)<\/em> “Red” Visible (0.64 \u00b5m<\/strong><\/a>) and \u201cClean\u201d Infrared Window (10.3 \u00b5m<\/strong><\/a>) images (with\/without an overlay of GLM<\/strong><\/a> Flash Extent Density<\/strong><\/a>) (above)<\/strong><\/em> — which included 15-minute plots of METAR surface reports and hourly plots of Fixed Buoy reports as Category 3 Hurricane Idalia<\/strong><\/a> made landfall along the Big Bend coat of Florida at 1145 UTC<\/strong><\/a> on 30 August 2023<\/strong><\/a>. The hurricane produced winds<\/strong><\/a> to 85 mph and rainfall<\/strong><\/a> amounts as high as 9.31 inches.<\/p>\n Note that the peak wind gust at the Keaton Beach<\/strong><\/a> buoy (KTNF1, located along the coast near the center of the GOES-16 images) was 72 knots at 1100 UTC — then the wind speed dropped to 0 knots (calm) at 1200 UTC as the eye of Idalia moved over that buoy location upon making landfall (below)<\/strong><\/em>. The raw surface report<\/strong><\/a> data indicated that the continuous wind speed was 37.1 m\/s (65 knots) at 1120 UTC.<\/p>\n Plots of Pressure (green), wind speed (blue) and wind gust (red) at Buoy KTNF1 (Keaton Beach).<\/p><\/div>\n Plot of peak wind gusts at Buoy KTNF1 (Keaton Beach).<\/p><\/div>\n An image (source<\/strong><\/a>) of RCM-1 Synthetic Aperture Radar (SAR) winds at 1140 UTC (just prior to the time of landfall) is shown below.<\/p>\n RCM-1 SAR winds at 1140 UTC [click to enlarge]<\/p><\/div>Idalia briefly reached Category 4 intensity, from 0900 UTC<\/strong><\/a> until shortly before landfall — 30-second GOES-16 Infrared images (below)<\/strong><\/em> showed Idalia during its transition to a Category 4 Hurricane until making landfall.<\/p>\n 30-second GOES-16 \u201cClean\u201d Infrared Window (10.3 \u00b5m) images from 0430-1200 UTC, with hourly Fixed Buoy reports plotted in white [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div> NOAA-20 VIIRS Day\/Night Band (0.7 \u00b5m) and Infrared Window (11.45 \u00b5m) images valid at 0715 UTC [click to enlarge]<\/p><\/div>Several hours prior to landfall, a toggle between VIIRS Day\/Night Band (0.7 \u00b5m) and Infrared Window (11.45 \u00b5m) images from NOAA-20 (mislabeled as NPP) valid at 0715 UTC (above)<\/strong><\/em> and Suomi-NPP valid at 0805 UTC (below)<\/strong><\/em> showed higher spatial resolution views of Category 3 Idalia. The eye of Idalia passed close to Buoy 42036<\/strong><\/a>, where there was a wind gust of 72 knots<\/strong><\/a> at 0640 UTC — and the prolonged period of strong winds associated with Idalia caused a notable decrease in water temperature<\/strong><\/a> on 30 August (due to the upwelling of cooler sub-surface water).<\/p>\n<\/a><\/a><\/a><\/a>
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