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Resuspended ash from the 1912 eruption of Novarupta-Katmai in Alaska

By Scott Bachmeier •

GOES-18 daytime True Color RGB + nighttime Dust RGB images, from 1650 UTC on 22 September to 1000 UTC on 23 September [click to play animated GIF | MP4]

10-minute Full Disk scan GOES-18 (GOES-West) daytime True Color RGB + nighttime Dust RGB images created using Geo2Grid (above) showed a plume of resuspended volcanic ash (hazy shades of tan in True Color RGB, and shades of violet in Dust RGB) from the 1912 Novarupta-Katmai eruption in Alaska — which was being transported offshore across the Shelikof Strait and over parts of Kodiak Island during 22-23 September 2025. Surface volcanic ash within the Valley Of Ten Thousand Smokes was being lofted by strong northwesterly winds that were being channeled through the valley.

According to this USGS Volcano Notice, the National Weather Service issued a SIGMET advising aviation interests that the maximum height of this resuspended ash was 6000 ft.

Categories: Aviation, Geo2Grid, GOES-18, Red-Green-Blue (RGB) images