GOES-18 daytime True Color RGB and Nighttime Microphysics RGB images, from 1850 UTC on 11 November to 0600 UTC on 12 November [click to play MP4 animation]

1-minute Mesoscale Domain Sector GOES-18 (GOES-West) daytime True Color RGB + Nighttime Microphysics RGB images from the CSPP GeoSphere site (above) showed a plume of resuspended volcanic ash (hazy shades of gray in True Color RGB, and brighter shades of pink in Nighttime Microphysics RGB) from the 1912 Novarupta-Katmai eruption in Alaska, which was being transported offshore across the Shelikof Strait toward Kodiak Island on 11 November 2023. A Volcanic Ash Advisory estimated that the ash was being lofted as high as 5000 feet above the surface.

GOES-18 Dust RGB images, from 1800 UTC on 11 November to 0600 UTC on 12 November [click to play animated GIF | MP4]

1-minute GOES-18 Dust RGB images (above) also highlighted the plume of resuspended volcanic ash (shades of pink) — loose surface ash that had been deposited within the Valley Of Ten Thousand Smokes was being lofted by strong northwesterly winds. A toggle between the 0300 UTC Dust RGB image and Topography (below) highlighted that particular valley as the ash source region.

GOES-18 Dust RGB image at 0300 UTC on 12 November, and Topography [click to enlarge]

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