{"id":34256,"date":"2019-09-01T21:55:57","date_gmt":"2019-09-01T21:55:57","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=34256"},"modified":"2019-09-22T21:41:21","modified_gmt":"2019-09-22T21:41:21","slug":"hurricane-dorian-reaches-category-5-intensity","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/34256","title":{"rendered":"Hurricane Dorian reaches Category 5 intensity"},"content":{"rendered":"

\"GOES-16<\/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>Overlapping 1-minute Mesoscale Domain Sectors<\/strong><\/a> provided GOES-16 (GOES-East)<\/em> \u201cRed\u201d Visible (0.64 \u00b5m<\/strong><\/a>) and \u201cClean\u201d Infrared Window (10.35 \u00b5m<\/strong><\/a>) images at 30-second<\/em> intervals (above)<\/strong><\/em> as Hurricane Dorian<\/strong><\/a> reached Category 5<\/strong><\/a> intensity just east of Great Abaco Island in the Bahamas during the morning hours on 01 September 2019. West of Dorian, station Identifier MYGF is Freeport on Grand Bahama Island (which stopped reporting at 00 UTC on 01 September, due to evacuation).<\/p>\n

As noted in the 15 UTC NHC discussion<\/strong><\/a>, the eye of Dorian was exhibiting a pronounced “stadium effect”, with a smaller-diameter surface eye sloping outward with increasing altitude (below)<\/strong><\/em>.<\/p>\n

\"GOES-16<\/a>

GOES-16 \u201cRed\u201d Visible (0.64 \u00b5m)<\/em> and \u201cClean\u201d Infrared Window (10.35 \u00b5m)<\/em> images at 1200 UTC [click to enlarge]<\/p><\/div>GOES-16 Visible images with and without overlays of GLM<\/strong><\/a> Flash Extent Density (below)<\/strong><\/em> revealed that lightning activity began to ramp up within the eyewall region after 12 UTC.<\/p>\n

\"GOES-16<\/a>

GOES-16 \u201cRed\u201d Visible (0.64 \u00b5m)<\/em> images, with and without overlays of GLM Flash Extent Density [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>A Mid-Level Wind Shear<\/strong><\/a> product (below)<\/strong> <\/em>showed that Dorian had been moving through an environment of low shear — generally 10 knots or less — during the 00-15 UTC time period on 01 September.<\/p>\n

\"Mid-layer<\/a>

Mid-layer Wind Shear product, 00-15 UTC [click to enlarge]<\/p><\/div>

<\/p>\n
\n

Updating every 60 seconds at 500 meter resolution, GOES-East was able to view Hurricane #Dorian<\/a> as it made landfall in the Bahamas.<\/p>\n

Notice the outer cays and shallow water adjacent to Great Abaco Island within a relatively clear eye. pic.twitter.com\/yS4SgIRzA6<\/a><\/p>\n

\u2014 NWS Grand Forks (@NWSGrandForks) September 1, 2019<\/a><\/p><\/blockquote>\n