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Resuspended ash from the 1912 Novarupta-Katmai eruption

By Scott Bachmeier •

GOES-18 Dust RGB images [click to play animated GIF | MP4]

1-minute Mesoscale Domain Sector GOES-18 (GOES-West) Dust RGB images (above) showed a plume of resuspended ash (brighter shades of pink) from the 1912 Novarupta-Katmai eruption in Alaska, which was being transported offshore across the Shelikof Strait toward Kodiak Island on 27 September 2023. Surface volcanic ash within the Valley Of Ten Thousand Smokes.was being lofted by strong northwesterly winds.

Volcanic ash (VA) was reported at Kodiak Airport (PADQ) for 7.5 hours, from 2123 UTC on 27 September to 0453 UTC 28 September (below) — for example, see METAR cursor sampling at 2200 UTC, 2300 UTC and 0000 UTC — but the ash was not restricting surface visibility below 10 miles.

Plot of surface report data from Kodiak Airport [click to enlarge]

1-minute GOES-18 Nighttime Microphysics RGB + daytime True Color RGB images from the CSPP GeoSphere site (below) provided a more detailed view of the ash plume.

GOES-18 Nighttime Microphysics RGB + daytime True Color RGB images [click to play MP4 animation]

Categories: GOES-18, Red-Green-Blue (RGB) images, Volcanic activity