Home Weather Storm Tracker Hurricane Sam reaches Category 4 intensity « CIMSS Satellite Blog

Hurricane Sam reaches Category 4 intensity « CIMSS Satellite Blog

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Hurricane Sam reaches Category 4 intensity « CIMSS Satellite Blog



September 25th, 2021 | Scott Bachmeier

GOES-16 “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images [click to play animation | MP4]

1–minute Mesoscale Domain Sector GOES-16 (GOES-East) “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images (above) showed Sam as it transitioned from a Category 3 to a Category 4 hurricane in the central Atlantic Ocean on 25 September 2021. The eye became cloud-filled during the middle portion of the day, but Visible images revealed the presence of mesovortices within the eye both early and late in the day.

GOES-16 Infrared images with an overlay of deep-layer wind shear at 2200 UTC, from the CIMSS Tropical Cyclones site (below) indicated that Sam was in an environment of low shear — which favored intensification as the hurricane moved across relatively warm water.

GOES-16 Infrared images, with an overlay of deep-layer wind shear at 2200 UTC [click to enlarge]



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