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Resuspended volcanic ash from the 1912 Novarupta-Katmai eruption

By Scott Bachmeier •

1-minute GOES-18 nighttime Dust RGB + daytime True Color RGB images, from 0920-2100 UTC on 07 April [click to play animated GIF | MP4]

1-minute Mesoscale Domain Sector GOES-18 (GOES-West) nighttime Dust RGB + daytime True Color RGB images created using Geo2Grid (above) revealed a plume of resuspended volcanic ash (shades of pink/magenta at night, hazy shades of tan during the day) from the 1912 Novarupta-Katmai eruption in Alaska — which was being transported offshore across the Shelikof Strait toward Kodiak Island on 07 April 2025. In the absence of snow cover, surface volcanic ash within the Valley Of Ten Thousand Smokes was being lofted by strong northwesterly winds that were being channeled through the valley. An advisory issued by the Anchorage Volcanic Ash Advisory Center (text | graphic) indicated that the resuspended ash layer extended to maximum altitude of 6000 ft.

In an animation of 1-minute GOES-18 Visible images (below) it is interesting to note that Buoy 46077 in the Shelikof Strait was situated within an eddy of relatively light and variable winds — and there appeared to be minimal amounts of resuspended ash that had become entrained within that eddy.

1-minute GOES-18 Visible images, from 1601-2100 UTC on 07 April [click to play MP4 animation]

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