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Resuspended ash from the 1912 Novarupta-Katmai eruption

By Scott Bachmeier •

10-minute GOES-18 daytime True Color RGB and nighttime Dust RGB images, from 1430 UTC on 15 August to 0240 UTC on 17 August [click to play animated GIF | MP4]

10-minute Full Disk scan GOES-18 (GOES-West) daytime True Color RGB and nighttime Dust RGB images created using Geo2Grid (above) showed a plume of resuspended volcanic ash (hazy shades of tan in True Color RGB, and subtle shades of violet in Dust RGB images) from the 1912 Novarupta-Katmai eruption in Alaska — which was being transported offshore across the Shelikof Strait and Kodiak Island, emerging over the Gulf of Alaska during 15-16 August 2025. Surface volcanic ash within the Valley Of Ten Thousand Smokes was being lofted by strong northwesterly winds (surface analyses) that were being channeled through the valley.

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

Other similar resuspended ash events have been documented here on this blog.

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